pcmcia: use mutex for dynid lock

Even though we weren't calling a blocking function within the dynid
spinlock, we do not need a spinlock here but can and should be using
a mutex.

Reported-by: Jiri Slaby <jirislaby@gmail.com>
Tested-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index 83b51dd..253d9ac 100644 (file)
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -124,9 +124,9 @@ pcmcia_store_new_id(struct device_driver *driver, const char *buf, size_t count)
        dynid->id.device_no = device_no;
        memcpy(dynid->id.prod_id_hash, prod_id_hash, sizeof(__u32) * 4);
 
-       spin_lock(&pdrv->dynids.lock);
+       mutex_lock(&pdrv->dynids.lock);
        list_add_tail(&dynid->node, &pdrv->dynids.list);
-       spin_unlock(&pdrv->dynids.lock);
+       mutex_unlock(&pdrv->dynids.lock);
 
        if (get_driver(&pdrv->drv)) {
                retval = driver_attach(&pdrv->drv);
@@ -144,12 +144,12 @@ pcmcia_free_dynids(struct pcmcia_driver *drv)
 {
        struct pcmcia_dynid *dynid, *n;
 
-       spin_lock(&drv->dynids.lock);
+       mutex_lock(&drv->dynids.lock);
        list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
                list_del(&dynid->node);
                kfree(dynid);
        }
-       spin_unlock(&drv->dynids.lock);
+       mutex_unlock(&drv->dynids.lock);
 }
 
 static int
@@ -180,7 +180,7 @@ int pcmcia_register_driver(struct pcmcia_driver *driver)
        /* initialize common fields */
        driver->drv.bus = &pcmcia_bus_type;
        driver->drv.owner = driver->owner;
-       spin_lock_init(&driver->dynids.lock);
+       mutex_init(&driver->dynids.lock);
        INIT_LIST_HEAD(&driver->dynids.list);
 
        pr_debug("registering driver %s\n", driver->drv.name);
@@ -894,16 +894,16 @@ static int pcmcia_bus_match(struct device *dev, struct device_driver *drv)
        struct pcmcia_dynid *dynid;
 
        /* match dynamic devices first */
-       spin_lock(&p_drv->dynids.lock);
+       mutex_lock(&p_drv->dynids.lock);
        list_for_each_entry(dynid, &p_drv->dynids.list, node) {
                dev_dbg(dev, "trying to match to %s\n", drv->name);
                if (pcmcia_devmatch(p_dev, &dynid->id)) {
                        dev_dbg(dev, "matched to %s\n", drv->name);
-                       spin_unlock(&p_drv->dynids.lock);
+                       mutex_unlock(&p_drv->dynids.lock);
                        return 1;
                }
        }
-       spin_unlock(&p_drv->dynids.lock);
+       mutex_unlock(&p_drv->dynids.lock);
 
 #ifdef CONFIG_PCMCIA_IOCTL
        /* matching by cardmgr */

diff --git a/include/pcmcia/ds.h b/include/pcmcia/ds.h
index ee14857..d57847f 100644 (file)
--- a/include/pcmcia/ds.h
+++ b/include/pcmcia/ds.h
@@ -40,7 +40,7 @@ struct net_device;
  * Documentation/pcmcia/driver.txt for details.
 */
 struct pcmcia_dynids {
-       spinlock_t              lock;
+       struct mutex            lock;
        struct list_head        list;
 };