regulator: Fix check of unsigned return value and transmit errors in wm831x_gp_ldo_ge...
[safe/jmp/linux-2.6] / drivers / edac / edac_device.c
index 26807af..d5e13c9 100644 (file)
@@ -20,6 +20,7 @@
 #include <linux/highmem.h>
 #include <linux/timer.h>
 #include <linux/slab.h>
+#include <linux/jiffies.h>
 #include <linux/spinlock.h>
 #include <linux/list.h>
 #include <linux/sysdev.h>
 #include "edac_core.h"
 #include "edac_module.h"
 
-/* lock to memory controller's control array */
-static DECLARE_MUTEX(device_ctls_mutex);
-static struct list_head edac_device_list = LIST_HEAD_INIT(edac_device_list);
-
-static inline void lock_device_list(void)
-{
-       down(&device_ctls_mutex);
-}
-
-static inline void unlock_device_list(void)
-{
-       up(&device_ctls_mutex);
-}
+/* lock for the list: 'edac_device_list', manipulation of this list
+ * is protected by the 'device_ctls_mutex' lock
+ */
+static DEFINE_MUTEX(device_ctls_mutex);
+static LIST_HEAD(edac_device_list);
 
 #ifdef CONFIG_EDAC_DEBUG
 static void edac_device_dump_device(struct edac_device_ctl_info *edac_dev)
@@ -57,85 +50,120 @@ static void edac_device_dump_device(struct edac_device_ctl_info *edac_dev)
 }
 #endif                         /* CONFIG_EDAC_DEBUG */
 
+
 /*
- * The alloc() and free() functions for the 'edac_device' control info
- * structure. A MC driver will allocate one of these for each edac_device
- * it is going to control/register with the EDAC CORE.
+ * edac_device_alloc_ctl_info()
+ *     Allocate a new edac device control info structure
+ *
+ *     The control structure is allocated in complete chunk
+ *     from the OS. It is in turn sub allocated to the
+ *     various objects that compose the struture
+ *
+ *     The structure has a 'nr_instance' array within itself.
+ *     Each instance represents a major component
+ *             Example:  L1 cache and L2 cache are 2 instance components
+ *
+ *     Within each instance is an array of 'nr_blocks' blockoffsets
  */
 struct edac_device_ctl_info *edac_device_alloc_ctl_info(
        unsigned sz_private,
-       char *edac_device_name,
-       unsigned nr_instances,
-       char *edac_block_name,
-       unsigned nr_blocks,
-       unsigned offset_value,
-       struct edac_attrib_spec
-       *attrib_spec,
-       unsigned nr_attribs)
+       char *edac_device_name, unsigned nr_instances,
+       char *edac_block_name, unsigned nr_blocks,
+       unsigned offset_value,          /* zero, 1, or other based offset */
+       struct edac_dev_sysfs_block_attribute *attrib_spec, unsigned nr_attrib,
+       int device_index)
 {
        struct edac_device_ctl_info *dev_ctl;
        struct edac_device_instance *dev_inst, *inst;
        struct edac_device_block *dev_blk, *blk_p, *blk;
-       struct edac_attrib *dev_attrib, *attrib_p, *attrib;
+       struct edac_dev_sysfs_block_attribute *dev_attrib, *attrib_p, *attrib;
        unsigned total_size;
        unsigned count;
        unsigned instance, block, attr;
        void *pvt;
+       int err;
 
-       debugf1("%s() instances=%d blocks=%d\n",
+       debugf4("%s() instances=%d blocks=%d\n",
                __func__, nr_instances, nr_blocks);
 
-       /* Figure out the offsets of the various items from the start of an
-        * ctl_info structure.  We want the alignment of each item
+       /* Calculate the size of memory we need to allocate AND
+        * determine the offsets of the various item arrays
+        * (instance,block,attrib) from the start of an  allocated structure.
+        * We want the alignment of each item  (instance,block,attrib)
         * to be at least as stringent as what the compiler would
         * provide if we could simply hardcode everything into a single struct.
         */
-       dev_ctl = (struct edac_device_ctl_info *)0;
+       dev_ctl = (struct edac_device_ctl_info *)NULL;
 
-       /* Calc the 'end' offset past the ctl_info structure */
-       dev_inst = (struct edac_device_instance *)
-           edac_align_ptr(&dev_ctl[1], sizeof(*dev_inst));
+       /* Calc the 'end' offset past end of ONE ctl_info structure
+        * which will become the start of the 'instance' array
+        */
+       dev_inst = edac_align_ptr(&dev_ctl[1], sizeof(*dev_inst));
 
-       /* Calc the 'end' offset past the instance array */
-       dev_blk = (struct edac_device_block *)
-           edac_align_ptr(&dev_inst[nr_instances], sizeof(*dev_blk));
+       /* Calc the 'end' offset past the instance array within the ctl_info
+        * which will become the start of the block array
+        */
+       dev_blk = edac_align_ptr(&dev_inst[nr_instances], sizeof(*dev_blk));
 
-       /* Calc the 'end' offset past the dev_blk array */
+       /* Calc the 'end' offset past the dev_blk array
+        * which will become the start of the attrib array, if any.
+        */
        count = nr_instances * nr_blocks;
-       dev_attrib = (struct edac_attrib *)
-           edac_align_ptr(&dev_blk[count], sizeof(*dev_attrib));
+       dev_attrib = edac_align_ptr(&dev_blk[count], sizeof(*dev_attrib));
+
+       /* Check for case of when an attribute array is specified */
+       if (nr_attrib > 0) {
+               /* calc how many nr_attrib we need */
+               count *= nr_attrib;
 
-       /* Check for case of NO attributes specified */
-       if (nr_attribs > 0)
-               count *= nr_attribs;
+               /* Calc the 'end' offset past the attributes array */
+               pvt = edac_align_ptr(&dev_attrib[count], sz_private);
+       } else {
+               /* no attribute array specificed */
+               pvt = edac_align_ptr(dev_attrib, sz_private);
+       }
 
-       /* Calc the 'end' offset past the attributes array */
-       pvt = edac_align_ptr(&dev_attrib[count], sz_private);
+       /* 'pvt' now points to where the private data area is.
+        * At this point 'pvt' (like dev_inst,dev_blk and dev_attrib)
+        * is baselined at ZERO
+        */
        total_size = ((unsigned long)pvt) + sz_private;
 
        /* Allocate the amount of memory for the set of control structures */
-       if ((dev_ctl = kmalloc(total_size, GFP_KERNEL)) == NULL)
+       dev_ctl = kzalloc(total_size, GFP_KERNEL);
+       if (dev_ctl == NULL)
                return NULL;
 
-       /* Adjust pointers so they point within the memory we just allocated
-        * rather than an imaginary chunk of memory located at address 0.
+       /* Adjust pointers so they point within the actual memory we
+        * just allocated rather than an imaginary chunk of memory
+        * located at address 0.
+        * 'dev_ctl' points to REAL memory, while the others are
+        * ZERO based and thus need to be adjusted to point within
+        * the allocated memory.
         */
        dev_inst = (struct edac_device_instance *)
-           (((char *)dev_ctl) + ((unsigned long)dev_inst));
+               (((char *)dev_ctl) + ((unsigned long)dev_inst));
        dev_blk = (struct edac_device_block *)
-           (((char *)dev_ctl) + ((unsigned long)dev_blk));
-       dev_attrib = (struct edac_attrib *)
-           (((char *)dev_ctl) + ((unsigned long)dev_attrib));
+               (((char *)dev_ctl) + ((unsigned long)dev_blk));
+       dev_attrib = (struct edac_dev_sysfs_block_attribute *)
+               (((char *)dev_ctl) + ((unsigned long)dev_attrib));
        pvt = sz_private ? (((char *)dev_ctl) + ((unsigned long)pvt)) : NULL;
 
-       memset(dev_ctl, 0, total_size); /* clear all fields */
+       /* Begin storing the information into the control info structure */
+       dev_ctl->dev_idx = device_index;
        dev_ctl->nr_instances = nr_instances;
        dev_ctl->instances = dev_inst;
        dev_ctl->pvt_info = pvt;
 
-       /* Name of this edac device, ensure null terminated */
-       snprintf(dev_ctl->name, sizeof(dev_ctl->name), "%s", edac_device_name);
-       dev_ctl->name[sizeof(dev_ctl->name) - 1] = '\0';
+       /* Default logging of CEs and UEs */
+       dev_ctl->log_ce = 1;
+       dev_ctl->log_ue = 1;
+
+       /* Name of this edac device */
+       snprintf(dev_ctl->name,sizeof(dev_ctl->name),"%s",edac_device_name);
+
+       debugf4("%s() edac_dev=%p next after end=%p\n",
+               __func__, dev_ctl, pvt + sz_private );
 
        /* Initialize every Instance */
        for (instance = 0; instance < nr_instances; instance++) {
@@ -148,35 +176,56 @@ struct edac_device_ctl_info *edac_device_alloc_ctl_info(
                /* name of this instance */
                snprintf(inst->name, sizeof(inst->name),
                         "%s%u", edac_device_name, instance);
-               inst->name[sizeof(inst->name) - 1] = '\0';
 
                /* Initialize every block in each instance */
                for (block = 0; block < nr_blocks; block++) {
                        blk = &blk_p[block];
                        blk->instance = inst;
-                       blk->nr_attribs = nr_attribs;
-                       attrib_p = &dev_attrib[block * nr_attribs];
-                       blk->attribs = attrib_p;
                        snprintf(blk->name, sizeof(blk->name),
-                                "%s%d", edac_block_name, block + 1);
-                       blk->name[sizeof(blk->name) - 1] = '\0';
-
-                       debugf1("%s() instance=%d block=%d name=%s\n",
-                               __func__, instance, block, blk->name);
-
-                       if (attrib_spec != NULL) {
-                               /* when there is an attrib_spec passed int then
-                                * Initialize every attrib of each block
+                                "%s%d", edac_block_name, block+offset_value);
+
+                       debugf4("%s() instance=%d inst_p=%p block=#%d "
+                               "block_p=%p name='%s'\n",
+                               __func__, instance, inst, block,
+                               blk, blk->name);
+
+                       /* if there are NO attributes OR no attribute pointer
+                        * then continue on to next block iteration
+                        */
+                       if ((nr_attrib == 0) || (attrib_spec == NULL))
+                               continue;
+
+                       /* setup the attribute array for this block */
+                       blk->nr_attribs = nr_attrib;
+                       attrib_p = &dev_attrib[block*nr_instances*nr_attrib];
+                       blk->block_attributes = attrib_p;
+
+                       debugf4("%s() THIS BLOCK_ATTRIB=%p\n",
+                               __func__, blk->block_attributes);
+
+                       /* Initialize every user specified attribute in this
+                        * block with the data the caller passed in
+                        * Each block gets its own copy of pointers,
+                        * and its unique 'value'
+                        */
+                       for (attr = 0; attr < nr_attrib; attr++) {
+                               attrib = &attrib_p[attr];
+
+                               /* populate the unique per attrib
+                                * with the code pointers and info
                                 */
-                               for (attr = 0; attr < nr_attribs; attr++) {
-                                       attrib = &attrib_p[attr];
-                                       attrib->block = blk;
-
-                                       /* Link each attribute to the caller's
-                                        * spec entry, for name and type
-                                        */
-                                       attrib->spec = &attrib_spec[attr];
-                               }
+                               attrib->attr = attrib_spec[attr].attr;
+                               attrib->show = attrib_spec[attr].show;
+                               attrib->store = attrib_spec[attr].store;
+
+                               attrib->block = blk;    /* up link */
+
+                               debugf4("%s() alloc-attrib=%p attrib_name='%s' "
+                                       "attrib-spec=%p spec-name=%s\n",
+                                       __func__, attrib, attrib->attr.name,
+                                       &attrib_spec[attr],
+                                       attrib_spec[attr].attr.name
+                                       );
                        }
                }
        }
@@ -184,9 +233,24 @@ struct edac_device_ctl_info *edac_device_alloc_ctl_info(
        /* Mark this instance as merely ALLOCATED */
        dev_ctl->op_state = OP_ALLOC;
 
+       /*
+        * Initialize the 'root' kobj for the edac_device controller
+        */
+       err = edac_device_register_sysfs_main_kobj(dev_ctl);
+       if (err) {
+               kfree(dev_ctl);
+               return NULL;
+       }
+
+       /* at this point, the root kobj is valid, and in order to
+        * 'free' the object, then the function:
+        *      edac_device_unregister_sysfs_main_kobj() must be called
+        * which will perform kobj unregistration and the actual free
+        * will occur during the kobject callback operation
+        */
+
        return dev_ctl;
 }
-
 EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info);
 
 /*
@@ -196,21 +260,26 @@ EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info);
  */
 void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info)
 {
-       kfree(ctl_info);
+       edac_device_unregister_sysfs_main_kobj(ctl_info);
 }
-
 EXPORT_SYMBOL_GPL(edac_device_free_ctl_info);
 
 /*
  * find_edac_device_by_dev
  *     scans the edac_device list for a specific 'struct device *'
+ *
+ *     lock to be held prior to call:  device_ctls_mutex
+ *
+ *     Return:
+ *             pointer to control structure managing 'dev'
+ *             NULL if not found on list
  */
 static struct edac_device_ctl_info *find_edac_device_by_dev(struct device *dev)
 {
        struct edac_device_ctl_info *edac_dev;
        struct list_head *item;
 
-       debugf3("%s()\n", __func__);
+       debugf0("%s()\n", __func__);
 
        list_for_each(item, &edac_device_list) {
                edac_dev = list_entry(item, struct edac_device_ctl_info, link);
@@ -226,6 +295,9 @@ static struct edac_device_ctl_info *find_edac_device_by_dev(struct device *dev)
  * add_edac_dev_to_global_list
  *     Before calling this function, caller must
  *     assign a unique value to edac_dev->dev_idx.
+ *
+ *     lock to be held prior to call:  device_ctls_mutex
+ *
  *     Return:
  *             0 on success
  *             1 on failure.
@@ -238,7 +310,8 @@ static int add_edac_dev_to_global_list(struct edac_device_ctl_info *edac_dev)
        insert_before = &edac_device_list;
 
        /* Determine if already on the list */
-       if (unlikely((rover = find_edac_device_by_dev(edac_dev->dev)) != NULL))
+       rover = find_edac_device_by_dev(edac_dev->dev);
+       if (unlikely(rover != NULL))
                goto fail0;
 
        /* Insert in ascending order by 'dev_idx', so find position */
@@ -257,23 +330,25 @@ static int add_edac_dev_to_global_list(struct edac_device_ctl_info *edac_dev)
        list_add_tail_rcu(&edac_dev->link, insert_before);
        return 0;
 
-      fail0:
+fail0:
        edac_printk(KERN_WARNING, EDAC_MC,
-                   "%s (%s) %s %s already assigned %d\n",
-                   rover->dev->bus_id, dev_name(rover),
-                   rover->mod_name, rover->ctl_name, rover->dev_idx);
+                       "%s (%s) %s %s already assigned %d\n",
+                       dev_name(rover->dev), edac_dev_name(rover),
+                       rover->mod_name, rover->ctl_name, rover->dev_idx);
        return 1;
 
-      fail1:
+fail1:
        edac_printk(KERN_WARNING, EDAC_MC,
-                   "bug in low-level driver: attempt to assign\n"
-                   "    duplicate dev_idx %d in %s()\n", rover->dev_idx,
-                   __func__);
+                       "bug in low-level driver: attempt to assign\n"
+                       "    duplicate dev_idx %d in %s()\n", rover->dev_idx,
+                       __func__);
        return 1;
 }
 
 /*
  * complete_edac_device_list_del
+ *
+ *     callback function when reference count is zero
  */
 static void complete_edac_device_list_del(struct rcu_head *head)
 {
@@ -281,75 +356,66 @@ static void complete_edac_device_list_del(struct rcu_head *head)
 
        edac_dev = container_of(head, struct edac_device_ctl_info, rcu);
        INIT_LIST_HEAD(&edac_dev->link);
-       complete(&edac_dev->complete);
 }
 
 /*
  * del_edac_device_from_global_list
+ *
+ *     remove the RCU, setup for a callback call,
+ *     then wait for the callback to occur
  */
 static void del_edac_device_from_global_list(struct edac_device_ctl_info
-                                            *edac_device)
+                                               *edac_device)
 {
        list_del_rcu(&edac_device->link);
-       init_completion(&edac_device->complete);
        call_rcu(&edac_device->rcu, complete_edac_device_list_del);
-       wait_for_completion(&edac_device->complete);
-}
-
-/**
- * edac_device_find
- *     Search for a edac_device_ctl_info structure whose index is 'idx'.
- *
- * If found, return a pointer to the structure.
- * Else return NULL.
- *
- * Caller must hold device_ctls_mutex.
- */
-struct edac_device_ctl_info *edac_device_find(int idx)
-{
-       struct list_head *item;
-       struct edac_device_ctl_info *edac_dev;
-
-       /* Iterate over list, looking for exact match of ID */
-       list_for_each(item, &edac_device_list) {
-               edac_dev = list_entry(item, struct edac_device_ctl_info, link);
-
-               if (edac_dev->dev_idx >= idx) {
-                       if (edac_dev->dev_idx == idx)
-                               return edac_dev;
-
-                       /* not on list, so terminate early */
-                       break;
-               }
-       }
-
-       return NULL;
+       rcu_barrier();
 }
 
-EXPORT_SYMBOL(edac_device_find);
-
 /*
  * edac_device_workq_function
  *     performs the operation scheduled by a workq request
+ *
+ *     this workq is embedded within an edac_device_ctl_info
+ *     structure, that needs to be polled for possible error events.
+ *
+ *     This operation is to acquire the list mutex lock
+ *     (thus preventing insertation or deletion)
+ *     and then call the device's poll function IFF this device is
+ *     running polled and there is a poll function defined.
  */
 static void edac_device_workq_function(struct work_struct *work_req)
 {
-       struct delayed_work *d_work = (struct delayed_work *)work_req;
+       struct delayed_work *d_work = to_delayed_work(work_req);
        struct edac_device_ctl_info *edac_dev = to_edac_device_ctl_work(d_work);
 
-       //debugf0("%s() here and running\n", __func__);
-       lock_device_list();
+       mutex_lock(&device_ctls_mutex);
+
+       /* If we are being removed, bail out immediately */
+       if (edac_dev->op_state == OP_OFFLINE) {
+               mutex_unlock(&device_ctls_mutex);
+               return;
+       }
 
        /* Only poll controllers that are running polled and have a check */
        if ((edac_dev->op_state == OP_RUNNING_POLL) &&
-           (edac_dev->edac_check != NULL)) {
-               edac_dev->edac_check(edac_dev);
+               (edac_dev->edac_check != NULL)) {
+                       edac_dev->edac_check(edac_dev);
        }
 
-       unlock_device_list();
+       mutex_unlock(&device_ctls_mutex);
 
-       /* Reschedule */
-       queue_delayed_work(edac_workqueue, &edac_dev->work, edac_dev->delay);
+       /* Reschedule the workq for the next time period to start again
+        * if the number of msec is for 1 sec, then adjust to the next
+        * whole one second to save timers fireing all over the period
+        * between integral seconds
+        */
+       if (edac_dev->poll_msec == 1000)
+               queue_delayed_work(edac_workqueue, &edac_dev->work,
+                               round_jiffies_relative(edac_dev->delay));
+       else
+               queue_delayed_work(edac_workqueue, &edac_dev->work,
+                               edac_dev->delay);
 }
 
 /*
@@ -358,15 +424,30 @@ static void edac_device_workq_function(struct work_struct *work_req)
  *     passing in the new delay period in msec
  */
 void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev,
-                            unsigned msec)
+                               unsigned msec)
 {
        debugf0("%s()\n", __func__);
 
+       /* take the arg 'msec' and set it into the control structure
+        * to used in the time period calculation
+        * then calc the number of jiffies that represents
+        */
        edac_dev->poll_msec = msec;
-       edac_calc_delay(edac_dev);      /* Calc delay jiffies */
+       edac_dev->delay = msecs_to_jiffies(msec);
 
        INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function);
-       queue_delayed_work(edac_workqueue, &edac_dev->work, edac_dev->delay);
+
+       /* optimize here for the 1 second case, which will be normal value, to
+        * fire ON the 1 second time event. This helps reduce all sorts of
+        * timers firing on sub-second basis, while they are happy
+        * to fire together on the 1 second exactly
+        */
+       if (edac_dev->poll_msec == 1000)
+               queue_delayed_work(edac_workqueue, &edac_dev->work,
+                               round_jiffies_relative(edac_dev->delay));
+       else
+               queue_delayed_work(edac_workqueue, &edac_dev->work,
+                               edac_dev->delay);
 }
 
 /*
@@ -386,44 +467,60 @@ void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev)
 
 /*
  * edac_device_reset_delay_period
+ *
+ *     need to stop any outstanding workq queued up at this time
+ *     because we will be resetting the sleep time.
+ *     Then restart the workq on the new delay
  */
-
 void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev,
-                                   unsigned long value)
+                                       unsigned long value)
 {
-       lock_device_list();
-
-       /* cancel the current workq request */
+       /* cancel the current workq request, without the mutex lock */
        edac_device_workq_teardown(edac_dev);
 
+       /* acquire the mutex before doing the workq setup */
+       mutex_lock(&device_ctls_mutex);
+
        /* restart the workq request, with new delay value */
        edac_device_workq_setup(edac_dev, value);
 
-       unlock_device_list();
+       mutex_unlock(&device_ctls_mutex);
+}
+
+/*
+ * edac_device_alloc_index: Allocate a unique device index number
+ *
+ * Return:
+ *     allocated index number
+ */
+int edac_device_alloc_index(void)
+{
+       static atomic_t device_indexes = ATOMIC_INIT(0);
+
+       return atomic_inc_return(&device_indexes) - 1;
 }
+EXPORT_SYMBOL_GPL(edac_device_alloc_index);
 
 /**
  * edac_device_add_device: Insert the 'edac_dev' structure into the
  * edac_device global list and create sysfs entries associated with
  * edac_device structure.
  * @edac_device: pointer to the edac_device structure to be added to the list
- * @edac_idx: A unique numeric identifier to be assigned to the
  * 'edac_device' structure.
  *
  * Return:
  *     0       Success
  *     !0      Failure
  */
-int edac_device_add_device(struct edac_device_ctl_info *edac_dev, int edac_idx)
+int edac_device_add_device(struct edac_device_ctl_info *edac_dev)
 {
        debugf0("%s()\n", __func__);
 
-       edac_dev->dev_idx = edac_idx;
 #ifdef CONFIG_EDAC_DEBUG
        if (edac_debug_level >= 3)
                edac_device_dump_device(edac_dev);
 #endif
-       lock_device_list();
+       mutex_lock(&device_ctls_mutex);
 
        if (add_edac_dev_to_global_list(edac_dev))
                goto fail0;
@@ -434,7 +531,7 @@ int edac_device_add_device(struct edac_device_ctl_info *edac_dev, int edac_idx)
        /* create this instance's sysfs entries */
        if (edac_device_create_sysfs(edac_dev)) {
                edac_device_printk(edac_dev, KERN_WARNING,
-                                  "failed to create sysfs device\n");
+                                       "failed to create sysfs device\n");
                goto fail1;
        }
 
@@ -454,25 +551,24 @@ int edac_device_add_device(struct edac_device_ctl_info *edac_dev, int edac_idx)
 
        /* Report action taken */
        edac_device_printk(edac_dev, KERN_INFO,
-                          "Giving out device to module '%s' controller '%s': DEV '%s' (%s)\n",
-                          edac_dev->mod_name,
-                          edac_dev->ctl_name,
-                          dev_name(edac_dev),
-                          edac_op_state_toString(edac_dev->op_state)
-           );
-
-       unlock_device_list();
+                               "Giving out device to module '%s' controller "
+                               "'%s': DEV '%s' (%s)\n",
+                               edac_dev->mod_name,
+                               edac_dev->ctl_name,
+                               edac_dev_name(edac_dev),
+                               edac_op_state_to_string(edac_dev->op_state));
+
+       mutex_unlock(&device_ctls_mutex);
        return 0;
 
-      fail1:
+fail1:
        /* Some error, so remove the entry from the lsit */
        del_edac_device_from_global_list(edac_dev);
 
-      fail0:
-       unlock_device_list();
+fail0:
+       mutex_unlock(&device_ctls_mutex);
        return 1;
 }
-
 EXPORT_SYMBOL_GPL(edac_device_add_device);
 
 /**
@@ -492,37 +588,38 @@ struct edac_device_ctl_info *edac_device_del_device(struct device *dev)
 {
        struct edac_device_ctl_info *edac_dev;
 
-       debugf0("MC: %s()\n", __func__);
+       debugf0("%s()\n", __func__);
 
-       lock_device_list();
+       mutex_lock(&device_ctls_mutex);
 
-       if ((edac_dev = find_edac_device_by_dev(dev)) == NULL) {
-               unlock_device_list();
+       /* Find the structure on the list, if not there, then leave */
+       edac_dev = find_edac_device_by_dev(dev);
+       if (edac_dev == NULL) {
+               mutex_unlock(&device_ctls_mutex);
                return NULL;
        }
 
        /* mark this instance as OFFLINE */
        edac_dev->op_state = OP_OFFLINE;
 
+       /* deregister from global list */
+       del_edac_device_from_global_list(edac_dev);
+
+       mutex_unlock(&device_ctls_mutex);
+
        /* clear workq processing on this instance */
        edac_device_workq_teardown(edac_dev);
 
        /* Tear down the sysfs entries for this instance */
        edac_device_remove_sysfs(edac_dev);
 
-       /* deregister from global list */
-       del_edac_device_from_global_list(edac_dev);
-
-       unlock_device_list();
-
        edac_printk(KERN_INFO, EDAC_MC,
-                   "Removed device %d for %s %s: DEV %s\n",
-                   edac_dev->dev_idx,
-                   edac_dev->mod_name, edac_dev->ctl_name, dev_name(edac_dev));
+               "Removed device %d for %s %s: DEV %s\n",
+               edac_dev->dev_idx,
+               edac_dev->mod_name, edac_dev->ctl_name, edac_dev_name(edac_dev));
 
        return edac_dev;
 }
-
 EXPORT_SYMBOL_GPL(edac_device_del_device);
 
 static inline int edac_device_get_log_ce(struct edac_device_ctl_info *edac_dev)
@@ -536,7 +633,7 @@ static inline int edac_device_get_log_ue(struct edac_device_ctl_info *edac_dev)
 }
 
 static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
-                                             *edac_dev)
+                                       *edac_dev)
 {
        return edac_dev->panic_on_ue;
 }
@@ -546,16 +643,16 @@ static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
  *     perform a common output and handling of an 'edac_dev' CE event
  */
 void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
-                          int inst_nr, int block_nr, const char *msg)
+                       int inst_nr, int block_nr, const char *msg)
 {
        struct edac_device_instance *instance;
        struct edac_device_block *block = NULL;
 
        if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
                edac_device_printk(edac_dev, KERN_ERR,
-                                  "INTERNAL ERROR: 'instance' out of range "
-                                  "(%d >= %d)\n", inst_nr,
-                                  edac_dev->nr_instances);
+                               "INTERNAL ERROR: 'instance' out of range "
+                               "(%d >= %d)\n", inst_nr,
+                               edac_dev->nr_instances);
                return;
        }
 
@@ -563,9 +660,10 @@ void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
 
        if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
                edac_device_printk(edac_dev, KERN_ERR,
-                                  "INTERNAL ERROR: instance %d 'block' out of range "
-                                  "(%d >= %d)\n", inst_nr, block_nr,
-                                  instance->nr_blocks);
+                               "INTERNAL ERROR: instance %d 'block' "
+                               "out of range (%d >= %d)\n",
+                               inst_nr, block_nr,
+                               instance->nr_blocks);
                return;
        }
 
@@ -580,11 +678,10 @@ void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
 
        if (edac_device_get_log_ce(edac_dev))
                edac_device_printk(edac_dev, KERN_WARNING,
-                                  "CE ctl: %s, instance: %s, block: %s: %s\n",
-                                  edac_dev->ctl_name, instance->name,
-                                  block ? block->name : "N/A", msg);
+                               "CE: %s instance: %s block: %s '%s'\n",
+                               edac_dev->ctl_name, instance->name,
+                               block ? block->name : "N/A", msg);
 }
-
 EXPORT_SYMBOL_GPL(edac_device_handle_ce);
 
 /*
@@ -592,16 +689,16 @@ EXPORT_SYMBOL_GPL(edac_device_handle_ce);
  *     perform a common output and handling of an 'edac_dev' UE event
  */
 void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
-                          int inst_nr, int block_nr, const char *msg)
+                       int inst_nr, int block_nr, const char *msg)
 {
        struct edac_device_instance *instance;
        struct edac_device_block *block = NULL;
 
        if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
                edac_device_printk(edac_dev, KERN_ERR,
-                                  "INTERNAL ERROR: 'instance' out of range "
-                                  "(%d >= %d)\n", inst_nr,
-                                  edac_dev->nr_instances);
+                               "INTERNAL ERROR: 'instance' out of range "
+                               "(%d >= %d)\n", inst_nr,
+                               edac_dev->nr_instances);
                return;
        }
 
@@ -609,9 +706,10 @@ void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
 
        if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
                edac_device_printk(edac_dev, KERN_ERR,
-                                  "INTERNAL ERROR: instance %d 'block' out of range "
-                                  "(%d >= %d)\n", inst_nr, block_nr,
-                                  instance->nr_blocks);
+                               "INTERNAL ERROR: instance %d 'block' "
+                               "out of range (%d >= %d)\n",
+                               inst_nr, block_nr,
+                               instance->nr_blocks);
                return;
        }
 
@@ -626,14 +724,13 @@ void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
 
        if (edac_device_get_log_ue(edac_dev))
                edac_device_printk(edac_dev, KERN_EMERG,
-                                  "UE ctl: %s, instance: %s, block: %s: %s\n",
-                                  edac_dev->ctl_name, instance->name,
-                                  block ? block->name : "N/A", msg);
+                               "UE: %s instance: %s block: %s '%s'\n",
+                               edac_dev->ctl_name, instance->name,
+                               block ? block->name : "N/A", msg);
 
        if (edac_device_get_panic_on_ue(edac_dev))
-               panic("EDAC %s: UE instance: %s, block %s: %s\n",
-                     edac_dev->ctl_name, instance->name,
-                     block ? block->name : "N/A", msg);
+               panic("EDAC %s: UE instance: %s block %s '%s'\n",
+                       edac_dev->ctl_name, instance->name,
+                       block ? block->name : "N/A", msg);
 }
-
 EXPORT_SYMBOL_GPL(edac_device_handle_ue);