platform driver: fix incorrect use of 'platform_bus_type' with 'struct device_driver'

This patch fixes the bug reported in
	http://bugzilla.kernel.org/show_bug.cgi?id=11681.

"Lots of device drivers register a 'struct device_driver' with
the '.bus' member set to '&platform_bus_type'. This is wrong,
since the platform_bus functions expect the 'struct device_driver'
to be wrapped up in a 'struct platform_driver' which provides
some additional callbacks (like suspend_late, resume_early).
The effect may be that platform_suspend_late() uses bogus data
outside the device_driver struct as a pointer pointer to the
device driver's suspend_late() function or other hard to
reproduce failures."(Lothar Wassmann)

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 19 insertions, 18 deletions

diff --git a/drivers/mtd/maps/pxa2xx-flash.c b/drivers/mtd/maps/pxa2xx-flash.c
index 771139c5bf8..e9026cb1c5b 100644
--- a/drivers/mtd/maps/pxa2xx-flash.c
+++ b/drivers/mtd/maps/pxa2xx-flash.c
@@ -41,9 +41,8 @@ struct pxa2xx_flash_info {
 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
 
 
-static int __init pxa2xx_flash_probe(struct device *dev)
+static int __init pxa2xx_flash_probe(struct platform_device *pdev)
 {
-        struct platform_device *pdev = to_platform_device(dev);
         struct flash_platform_data *flash = pdev->dev.platform_data;
         struct pxa2xx_flash_info *info;
         struct mtd_partition *parts;
@@ -114,15 +113,15 @@ static int __init pxa2xx_flash_probe(struct device *dev)
                 add_mtd_device(info->mtd);
         }
 
-        dev_set_drvdata(dev, info);
+        platform_set_drvdata(pdev, info);
         return 0;
 }
 
-static int __exit pxa2xx_flash_remove(struct device *dev)
+static int __exit pxa2xx_flash_remove(struct platform_device *dev)
 {
-        struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
+        struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 
-        dev_set_drvdata(dev, NULL);
+        platform_set_drvdata(dev, NULL);
 
 #ifdef CONFIG_MTD_PARTITIONS
         if (info->nr_parts)
@@ -141,9 +140,9 @@ static int __exit pxa2xx_flash_remove(struct device *dev)
 }
 
 #ifdef CONFIG_PM
-static int pxa2xx_flash_suspend(struct device *dev, pm_message_t state)
+static int pxa2xx_flash_suspend(struct platform_device *dev, pm_message_t state)
 {
-        struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
+        struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
         int ret = 0;
 
         if (info->mtd && info->mtd->suspend)
@@ -151,17 +150,17 @@ static int pxa2xx_flash_suspend(struct device *dev, pm_message_t state)
         return ret;
 }
 
-static int pxa2xx_flash_resume(struct device *dev)
+static int pxa2xx_flash_resume(struct platform_device *dev)
 {
-        struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
+        struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 
         if (info->mtd && info->mtd->resume)
                 info->mtd->resume(info->mtd);
         return 0;
 }
-static void pxa2xx_flash_shutdown(struct device *dev)
+static void pxa2xx_flash_shutdown(struct platform_device *dev)
 {
-        struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
+        struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
 
         if (info && info->mtd->suspend(info->mtd) == 0)
                 info->mtd->resume(info->mtd);
@@ -172,11 +171,13 @@ static void pxa2xx_flash_shutdown(struct device *dev)
 #define pxa2xx_flash_shutdown NULL
 #endif
 
-static struct device_driver pxa2xx_flash_driver = {
-        .name           = "pxa2xx-flash",
-        .bus            = &platform_bus_type,
+static struct platform_driver pxa2xx_flash_driver = {
+        .driver = {
+                .name           = "pxa2xx-flash",
+                .owner          = THIS_MODULE,
+        },
         .probe          = pxa2xx_flash_probe,
-        .remove         = __exit_p(pxa2xx_flash_remove),
+        .remove         = __devexit_p(pxa2xx_flash_remove),
         .suspend        = pxa2xx_flash_suspend,
         .resume         = pxa2xx_flash_resume,
         .shutdown       = pxa2xx_flash_shutdown,
@@ -184,12 +185,12 @@ static struct device_driver pxa2xx_flash_driver = {
 
 static int __init init_pxa2xx_flash(void)
 {
-        return driver_register(&pxa2xx_flash_driver);
+        return platform_driver_register(&pxa2xx_flash_driver);
 }
 
 static void __exit cleanup_pxa2xx_flash(void)
 {
-        driver_unregister(&pxa2xx_flash_driver);
+        platform_driver_unregister(&pxa2xx_flash_driver);
 }
 
 module_init(init_pxa2xx_flash);