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, 14 insertions, 11 deletions

diff --git a/drivers/video/au1200fb.c b/drivers/video/au1200fb.c
index 03e57ef88378..0d96f1d2d4c5 100644
--- a/drivers/video/au1200fb.c
+++ b/drivers/video/au1200fb.c
@@ -1622,7 +1622,7 @@ static int au1200fb_init_fbinfo(struct au1200fb_device *fbdev)
 
 /* AU1200 LCD controller device driver */
 
-static int au1200fb_drv_probe(struct device *dev)
+static int au1200fb_drv_probe(struct platform_device *dev)
 {
         struct au1200fb_device *fbdev;
         unsigned long page;
@@ -1645,7 +1645,7 @@ static int au1200fb_drv_probe(struct device *dev)
                 /* Allocate the framebuffer to the maximum screen size */
                 fbdev->fb_len = (win->w[plane].xres * win->w[plane].yres * bpp) / 8;
 
-                fbdev->fb_mem = dma_alloc_noncoherent(dev,
+                fbdev->fb_mem = dma_alloc_noncoherent(&dev->dev,
                                 PAGE_ALIGN(fbdev->fb_len),
                                 &fbdev->fb_phys, GFP_KERNEL);
                 if (!fbdev->fb_mem) {
@@ -1715,7 +1715,7 @@ failed:
         return ret;
 }
 
-static int au1200fb_drv_remove(struct device *dev)
+static int au1200fb_drv_remove(struct platform_device *dev)
 {
         struct au1200fb_device *fbdev;
         int plane;
@@ -1733,7 +1733,8 @@ static int au1200fb_drv_remove(struct device *dev)
                 /* Clean up all probe data */
                 unregister_framebuffer(&fbdev->fb_info);
                 if (fbdev->fb_mem)
-                        dma_free_noncoherent(dev, PAGE_ALIGN(fbdev->fb_len),
+                        dma_free_noncoherent(&dev->dev,
+                                        PAGE_ALIGN(fbdev->fb_len),
                                         fbdev->fb_mem, fbdev->fb_phys);
                 if (fbdev->fb_info.cmap.len != 0)
                         fb_dealloc_cmap(&fbdev->fb_info.cmap);
@@ -1747,22 +1748,24 @@ static int au1200fb_drv_remove(struct device *dev)
 }
 
 #ifdef CONFIG_PM
-static int au1200fb_drv_suspend(struct device *dev, u32 state, u32 level)
+static int au1200fb_drv_suspend(struct platform_device *dev, u32 state)
 {
         /* TODO */
         return 0;
 }
 
-static int au1200fb_drv_resume(struct device *dev, u32 level)
+static int au1200fb_drv_resume(struct platform_device *dev)
 {
         /* TODO */
         return 0;
 }
 #endif /* CONFIG_PM */
 
-static struct device_driver au1200fb_driver = {
-        .name           = "au1200-lcd",
-        .bus            = &platform_bus_type,
+static struct platform_driver au1200fb_driver = {
+        .driver = {
+                .name           = "au1200-lcd",
+                .owner          = THIS_MODULE,
+        },
         .probe          = au1200fb_drv_probe,
         .remove         = au1200fb_drv_remove,
 #ifdef CONFIG_PM
@@ -1906,12 +1909,12 @@ static int __init au1200fb_init(void)
                 printk(KERN_INFO "Power management device entry for the au1200fb loaded.\n");
         #endif
 
-        return driver_register(&au1200fb_driver);
+        return platform_driver_register(&au1200fb_driver);
 }
 
 static void __exit au1200fb_cleanup(void)
 {
-        driver_unregister(&au1200fb_driver);
+        platform_driver_unregister(&au1200fb_driver);
 }
 
 module_init(au1200fb_init);