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, 21 insertions, 9 deletions

diff --git a/drivers/pcmcia/m32r_cfc.c b/drivers/pcmcia/m32r_cfc.c
index 2ab4f22c21de..62b4ecc97c46 100644
--- a/drivers/pcmcia/m32r_cfc.c
+++ b/drivers/pcmcia/m32r_cfc.c
@@ -696,13 +696,25 @@ static struct pccard_operations pcc_operations = {
         .set_mem_map            = pcc_set_mem_map,
 };
 
+static int cfc_drv_pcmcia_suspend(struct platform_device *dev,
+                                     pm_message_t state)
+{
+        return pcmcia_socket_dev_suspend(&dev->dev, state);
+}
+
+static int cfc_drv_pcmcia_resume(struct platform_device *dev)
+{
+        return pcmcia_socket_dev_resume(&dev->dev);
+}
 /*====================================================================*/
 
-static struct device_driver pcc_driver = {
-        .name = "cfc",
-        .bus = &platform_bus_type,
-        .suspend = pcmcia_socket_dev_suspend,
-        .resume = pcmcia_socket_dev_resume,
+static struct platform_driver pcc_driver = {
+        .driver = {
+                .name           = "cfc",
+                .owner          = THIS_MODULE,
+        },
+        .suspend        = cfc_drv_pcmcia_suspend,
+        .resume         = cfc_drv_pcmcia_resume,
 };
 
 static struct platform_device pcc_device = {
@@ -716,13 +728,13 @@ static int __init init_m32r_pcc(void)
 {
         int i, ret;
 
-        ret = driver_register(&pcc_driver);
+        ret = platform_driver_register(&pcc_driver);
         if (ret)
                 return ret;
 
         ret = platform_device_register(&pcc_device);
         if (ret){
-                driver_unregister(&pcc_driver);
+                platform_driver_unregister(&pcc_driver);
                 return ret;
         }
 
@@ -754,7 +766,7 @@ static int __init init_m32r_pcc(void)
         if (pcc_sockets == 0) {
                 printk("socket is not found.\n");
                 platform_device_unregister(&pcc_device);
-                driver_unregister(&pcc_driver);
+                platform_driver_unregister(&pcc_driver);
                 return -ENODEV;
         }
 
@@ -802,7 +814,7 @@ static void __exit exit_m32r_pcc(void)
         if (poll_interval != 0)
                 del_timer_sync(&poll_timer);
 
-        driver_unregister(&pcc_driver);
+        platform_driver_unregister(&pcc_driver);
 } /* exit_m32r_pcc */
 
 module_init(init_m32r_pcc);