maple: more robust device detection.

Replacement second-in-series patch:

This patch fixes up memory leaks and, by delaying initialisation, makes
device detection more robust.

It also makes clearer the difference between struct maple_device and
struct device, as well as cleaning up the interrupt request code
(without changing its function in any way).

Also now removes redundant registration checking.

Signed-off-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/drivers/sh/maple/maple.c b/drivers/sh/maple/maple.c
index 9c48ccc..616e226 100644 (file)
--- a/drivers/sh/maple/maple.c
+++ b/drivers/sh/maple/maple.c
@@ -31,6 +31,7 @@
 #include <asm/mach/dma.h>
 #include <asm/mach/sysasic.h>
 #include <asm/mach/maple.h>
+#include <linux/delay.h>
 
 MODULE_AUTHOR("Yaegshi Takeshi, Paul Mundt, M.R. Brown, Adrian McMenamin");
 MODULE_DESCRIPTION("Maple bus driver for Dreamcast");
@@ -53,7 +54,7 @@ static struct device maple_bus;
 static int subdevice_map[MAPLE_PORTS];
 static unsigned long *maple_sendbuf, *maple_sendptr, *maple_lastptr;
 static unsigned long maple_pnp_time;
-static int started, scanning, liststatus;
+static int started, scanning, liststatus, realscan;
 static struct kmem_cache *maple_queue_cache;
 
 struct maple_device_specify {
@@ -73,7 +74,6 @@ int maple_driver_register(struct device_driver *drv)
        drv->bus = &maple_bus_type;
        return driver_register(drv);
 }
-
 EXPORT_SYMBOL_GPL(maple_driver_register);
 
 /* set hardware registers to enable next round of dma */
@@ -95,15 +95,14 @@ static void maplebus_dma_reset(void)
  * @function: the function code for the device
  */
 void maple_getcond_callback(struct maple_device *dev,
-                           void (*callback) (struct mapleq * mq),
-                           unsigned long interval, unsigned long function)
+                       void (*callback) (struct mapleq *mq),
+                       unsigned long interval, unsigned long function)
 {
        dev->callback = callback;
        dev->interval = interval;
        dev->function = cpu_to_be32(function);
        dev->when = jiffies;
 }
-
 EXPORT_SYMBOL_GPL(maple_getcond_callback);
 
 static int maple_dma_done(void)
@@ -113,10 +112,19 @@ static int maple_dma_done(void)
 
 static void maple_release_device(struct device *dev)
 {
-       if (dev->type) {
-               kfree(dev->type->name);
-               kfree(dev->type);
+       struct maple_device *mdev;
+       struct mapleq *mq;
+       if (!dev)
+               return;
+       mdev = to_maple_dev(dev);
+       mq = mdev->mq;
+       if (mq) {
+               if (mq->recvbufdcsp)
+                       kmem_cache_free(maple_queue_cache, mq->recvbufdcsp);
+               kfree(mq);
+               mq = NULL;
        }
+       kfree(mdev);
 }
 
 /**
@@ -129,10 +137,9 @@ void maple_add_packet(struct mapleq *mq)
        list_add(&mq->list, &maple_waitq);
        mutex_unlock(&maple_list_lock);
 }
-
 EXPORT_SYMBOL_GPL(maple_add_packet);
 
-static struct mapleq *maple_allocq(struct maple_device *dev)
+static struct mapleq *maple_allocq(struct maple_device *mdev)
 {
        struct mapleq *mq;
 
@@ -140,7 +147,7 @@ static struct mapleq *maple_allocq(struct maple_device *dev)
        if (!mq)
                return NULL;
 
-       mq->dev = dev;
+       mq->dev = mdev;
        mq->recvbufdcsp = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL);
        mq->recvbuf = (void *) P2SEGADDR(mq->recvbufdcsp);
        if (!mq->recvbuf) {
@@ -153,22 +160,24 @@ static struct mapleq *maple_allocq(struct maple_device *dev)
 
 static struct maple_device *maple_alloc_dev(int port, int unit)
 {
-       struct maple_device *dev;
+       struct maple_device *mdev;
 
-       dev = kzalloc(sizeof(*dev), GFP_KERNEL);
-       if (!dev)
+       mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
+       if (!mdev)
                return NULL;
 
-       dev->port = port;
-       dev->unit = unit;
-       dev->mq = maple_allocq(dev);
+       mdev->port = port;
+       mdev->unit = unit;
+       mdev->mq = maple_allocq(mdev);
 
-       if (!dev->mq) {
-               kfree(dev);
+       if (!mdev->mq) {
+               kfree(mdev);
                return NULL;
        }
-
-       return dev;
+       mdev->dev.bus = &maple_bus_type;
+       mdev->dev.parent = &maple_bus;
+       mdev->function = 0;
+       return mdev;
 }
 
 static void maple_free_dev(struct maple_device *mdev)
@@ -176,7 +185,9 @@ static void maple_free_dev(struct maple_device *mdev)
        if (!mdev)
                return;
        if (mdev->mq) {
-               kmem_cache_free(maple_queue_cache, mdev->mq->recvbufdcsp);
+               if (mdev->mq->recvbufdcsp)
+                       kmem_cache_free(maple_queue_cache,
+                               mdev->mq->recvbufdcsp);
                kfree(mdev->mq);
        }
        kfree(mdev);
@@ -260,80 +271,89 @@ static void maple_detach_driver(struct maple_device *mdev)
                        mdev->driver->disconnect(mdev);
        }
        mdev->driver = NULL;
-       if (mdev->registered) {
-               maple_release_device(&mdev->dev);
-               device_unregister(&mdev->dev);
-       }
-       mdev->registered = 0;
-       maple_free_dev(mdev);
+       device_unregister(&mdev->dev);
+       mdev = NULL;
 }
 
 /* process initial MAPLE_COMMAND_DEVINFO for each device or port */
-static void maple_attach_driver(struct maple_device *dev)
+static void maple_attach_driver(struct maple_device *mdev)
 {
-       char *p;
-
-       char *recvbuf;
+       char *p, *recvbuf;
        unsigned long function;
        int matched, retval;
 
-       recvbuf = dev->mq->recvbuf;
-       memcpy(&dev->devinfo, recvbuf + 4, sizeof(dev->devinfo));
-       memcpy(dev->product_name, dev->devinfo.product_name, 30);
-       memcpy(dev->product_licence, dev->devinfo.product_licence, 60);
-       dev->product_name[30] = '\0';
-       dev->product_licence[60] = '\0';
-
-       for (p = dev->product_name + 29; dev->product_name <= p; p--)
+       recvbuf = mdev->mq->recvbuf;
+       /* copy the data as individual elements in
+       * case of memory optimisation */
+       memcpy(&mdev->devinfo.function, recvbuf + 4, 4);
+       memcpy(&mdev->devinfo.function_data[0], recvbuf + 8, 12);
+       memcpy(&mdev->devinfo.area_code, recvbuf + 20, 1);
+       memcpy(&mdev->devinfo.connector_direction, recvbuf + 21, 1);
+       memcpy(&mdev->devinfo.product_name[0], recvbuf + 22, 30);
+       memcpy(&mdev->devinfo.product_licence[0], recvbuf + 52, 60);
+       memcpy(&mdev->devinfo.standby_power, recvbuf + 112, 2);
+       memcpy(&mdev->devinfo.max_power, recvbuf + 114, 2);
+       memcpy(mdev->product_name, mdev->devinfo.product_name, 30);
+       mdev->product_name[30] = '\0';
+       memcpy(mdev->product_licence, mdev->devinfo.product_licence, 60);
+       mdev->product_licence[60] = '\0';
+
+       for (p = mdev->product_name + 29; mdev->product_name <= p; p--)
                if (*p == ' ')
                        *p = '\0';
                else
                        break;
-
-       for (p = dev->product_licence + 59; dev->product_licence <= p; p--)
+       for (p = mdev->product_licence + 59; mdev->product_licence <= p; p--)
                if (*p == ' ')
                        *p = '\0';
                else
                        break;
 
-       function = be32_to_cpu(dev->devinfo.function);
+       if (realscan) {
+               printk(KERN_INFO "Maple device detected: %s\n",
+                       mdev->product_name);
+               printk(KERN_INFO "Maple device: %s\n", mdev->product_licence);
+       }
+
+       function = be32_to_cpu(mdev->devinfo.function);
 
        if (function > 0x200) {
                /* Do this silently - as not a real device */
                function = 0;
-               dev->driver = &maple_dummy_driver;
-               sprintf(dev->dev.bus_id, "%d:0.port", dev->port);
+               mdev->driver = &maple_dummy_driver;
+               sprintf(mdev->dev.bus_id, "%d:0.port", mdev->port);
        } else {
-               printk(KERN_INFO
-                      "Maple bus at (%d, %d): Connected function 0x%lX\n",
-                      dev->port, dev->unit, function);
+               if (realscan)
+                       printk(KERN_INFO
+                               "Maple bus at (%d, %d): Function 0x%lX\n",
+                               mdev->port, mdev->unit, function);
 
                matched =
-                   bus_for_each_drv(&maple_bus_type, NULL, dev,
+                   bus_for_each_drv(&maple_bus_type, NULL, mdev,
                                     attach_matching_maple_driver);
 
                if (matched == 0) {
                        /* Driver does not exist yet */
-                       printk(KERN_INFO
-                              "No maple driver found for this device\n");
-                       dev->driver = &maple_dummy_driver;
+                       if (realscan)
+                               printk(KERN_INFO
+                                       "No maple driver found.\n");
+                       mdev->driver = &maple_dummy_driver;
                }
-
-               sprintf(dev->dev.bus_id, "%d:0%d.%lX", dev->port,
-                       dev->unit, function);
+               sprintf(mdev->dev.bus_id, "%d:0%d.%lX", mdev->port,
+                       mdev->unit, function);
        }
-       dev->function = function;
-       dev->dev.bus = &maple_bus_type;
-       dev->dev.parent = &maple_bus;
-       dev->dev.release = &maple_release_device;
-       retval = device_register(&dev->dev);
+       mdev->function = function;
+       mdev->dev.release = &maple_release_device;
+       retval = device_register(&mdev->dev);
        if (retval) {
                printk(KERN_INFO
-                      "Maple bus: Attempt to register device (%x, %x) failed.\n",
-                      dev->port, dev->unit);
-               maple_free_dev(dev);
+               "Maple bus: Attempt to register device"
+               " (%x, %x) failed.\n",
+               mdev->port, mdev->unit);
+               maple_free_dev(mdev);
+               mdev = NULL;
+               return;
        }
-       dev->registered = 1;
 }
 
 /*
@@ -519,7 +539,8 @@ static void maple_dma_handler(struct work_struct *work)
 
                        case MAPLE_RESPONSE_ALLINFO:
                                printk(KERN_DEBUG
-                                      "Maple - extended device information not supported\n");
+                                      "Maple - extended device information"
+                                       " not supported\n");
                                break;
 
                        case MAPLE_RESPONSE_OK:
@@ -555,26 +576,16 @@ static irqreturn_t maplebus_vblank_interrupt(int irq, void *dev_id)
        return IRQ_HANDLED;
 }
 
-static struct irqaction maple_dma_irq = {
-       .name = "maple bus DMA handler",
-       .handler = maplebus_dma_interrupt,
-       .flags = IRQF_SHARED,
-};
-
-static struct irqaction maple_vblank_irq = {
-       .name = "maple bus VBLANK handler",
-       .handler = maplebus_vblank_interrupt,
-       .flags = IRQF_SHARED,
-};
-
 static int maple_set_dma_interrupt_handler(void)
 {
-       return setup_irq(HW_EVENT_MAPLE_DMA, &maple_dma_irq);
+       return request_irq(HW_EVENT_MAPLE_DMA, maplebus_dma_interrupt,
+               IRQF_SHARED, "maple bus DMA", &maple_dummy_driver);
 }
 
 static int maple_set_vblank_interrupt_handler(void)
 {
-       return setup_irq(HW_EVENT_VSYNC, &maple_vblank_irq);
+       return request_irq(HW_EVENT_VSYNC, maplebus_vblank_interrupt,
+               IRQF_SHARED, "maple bus VBLANK", &maple_dummy_driver);
 }
 
 static int maple_get_dma_buffer(void)
@@ -618,7 +629,7 @@ static struct maple_driver maple_dummy_driver = {
        .drv = {
                .name = "maple_dummy_driver",
                .bus = &maple_bus_type,
-               },
+       },
 };
 
 struct bus_type maple_bus_type = {
@@ -626,7 +637,6 @@ struct bus_type maple_bus_type = {
        .match = match_maple_bus_driver,
        .uevent = maple_bus_uevent,
 };
-
 EXPORT_SYMBOL_GPL(maple_bus_type);
 
 static struct device maple_bus = {
@@ -678,7 +688,7 @@ static int __init maple_bus_init(void)
 
        maple_queue_cache =
            kmem_cache_create("maple_queue_cache", 0x400, 0,
-                             SLAB_HWCACHE_ALIGN, NULL);
+                             SLAB_POISON|SLAB_HWCACHE_ALIGN, NULL);
 
        if (!maple_queue_cache)
                goto cleanup_bothirqs;
@@ -691,50 +701,48 @@ static int __init maple_bus_init(void)
                                maple_free_dev(mdev[i]);
                        goto cleanup_cache;
                }
-               mdev[i]->registered = 0;
                mdev[i]->mq->command = MAPLE_COMMAND_DEVINFO;
                mdev[i]->mq->length = 0;
-               maple_attach_driver(mdev[i]);
                maple_add_packet(mdev[i]->mq);
+               /* delay aids hardware detection */
+               udelay(20);
                subdevice_map[i] = 0;
        }
 
+       realscan = 1;
        /* setup maplebus hardware */
        maplebus_dma_reset();
-
        /* initial detection */
        maple_send();
-
        maple_pnp_time = jiffies;
-
        printk(KERN_INFO "Maple bus core now registered.\n");
 
        return 0;
 
-      cleanup_cache:
+cleanup_cache:
        kmem_cache_destroy(maple_queue_cache);
 
-      cleanup_bothirqs:
+cleanup_bothirqs:
        free_irq(HW_EVENT_VSYNC, 0);
 
-      cleanup_irq:
+cleanup_irq:
        free_irq(HW_EVENT_MAPLE_DMA, 0);
 
-      cleanup_dma:
+cleanup_dma:
        free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES);
 
-      cleanup_basic:
+cleanup_basic:
        driver_unregister(&maple_dummy_driver.drv);
 
-      cleanup_bus:
+cleanup_bus:
        bus_unregister(&maple_bus_type);
 
-      cleanup_device:
+cleanup_device:
        device_unregister(&maple_bus);
 
-      cleanup:
+cleanup:
        printk(KERN_INFO "Maple bus registration failed\n");
        return retval;
 }
-
-subsys_initcall(maple_bus_init);
+/* Push init to later to ensure hardware gets detected */
+fs_initcall(maple_bus_init);