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, 12 insertions, 15 deletions

diff --git a/drivers/watchdog/rm9k_wdt.c b/drivers/watchdog/rm9k_wdt.c
index f1ae3729a19..cce1982a1b5 100644
--- a/drivers/watchdog/rm9k_wdt.c
+++ b/drivers/watchdog/rm9k_wdt.c
@@ -59,8 +59,8 @@ static long wdt_gpi_ioctl(struct file *, unsigned int, unsigned long);
 static int wdt_gpi_notify(struct notifier_block *, unsigned long, void *);
 static const struct resource *wdt_gpi_get_resource(struct platform_device *,
                                                 const char *, unsigned int);
-static int __init wdt_gpi_probe(struct device *);
-static int __exit wdt_gpi_remove(struct device *);
+static int __init wdt_gpi_probe(struct platform_device *);
+static int __exit wdt_gpi_remove(struct platform_device *);
 
 
 static const char wdt_gpi_name[] = "wdt_gpi";
@@ -346,10 +346,9 @@ static const struct resource *wdt_gpi_get_resource(struct platform_device *pdv,
 }
 
 /* No hotplugging on the platform bus - use __init */
-static int __init wdt_gpi_probe(struct device *dev)
+static int __init wdt_gpi_probe(struct platform_device *pdv)
 {
         int res;
-        struct platform_device * const pdv = to_platform_device(dev);
         const struct resource
                 * const rr = wdt_gpi_get_resource(pdv, WDT_RESOURCE_REGS,
                                                   IORESOURCE_MEM),
@@ -374,7 +373,7 @@ static int __init wdt_gpi_probe(struct device *dev)
         return res;
 }
 
-static int __exit wdt_gpi_remove(struct device *dev)
+static int __exit wdt_gpi_remove(struct platform_device *dev)
 {
         int res;
 
@@ -387,15 +386,13 @@ static int __exit wdt_gpi_remove(struct device *dev)
 
 
 /* Device driver init & exit */
-static struct device_driver wdt_gpi_driver = {
-        .name           = (char *) wdt_gpi_name,
-        .bus            = &platform_bus_type,
-        .owner          = THIS_MODULE,
+static struct platform_driver wgt_gpi_driver = {
+        .driver = {
+                .name           = wdt_gpi_name,
+                .owner          = THIS_MODULE,
+        },
         .probe          = wdt_gpi_probe,
-        .remove         = __exit_p(wdt_gpi_remove),
-        .shutdown       = NULL,
-        .suspend        = NULL,
-        .resume         = NULL,
+        .remove         = __devexit_p(wdt_gpi_remove),
 };
 
 static int __init wdt_gpi_init_module(void)
@@ -403,12 +400,12 @@ static int __init wdt_gpi_init_module(void)
         atomic_set(&opencnt, 1);
         if (timeout > MAX_TIMEOUT_SECONDS)
                 timeout = MAX_TIMEOUT_SECONDS;
-        return driver_register(&wdt_gpi_driver);
+        return platform_driver_register(&wdt_gpi_driver);
 }
 
 static void __exit wdt_gpi_cleanup_module(void)
 {
-        driver_unregister(&wdt_gpi_driver);
+        platform_driver_unregister(&wdt_gpi_driver);
 }
 
 module_init(wdt_gpi_init_module);