[DRIVER MODEL] Fix gbefb

Statically allocated devices in module data is a potential cause
of oopsen.  The device may be in use by a userspace process, which
will keep a reference to the device.  If the module is unloaded,
the module data will be freed.  Subsequent use of the platform
device will cause a kernel oops.

Use generic platform device allocation/release code in modules.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 12 insertions, 6 deletions

diff --git a/drivers/video/gbefb.c b/drivers/video/gbefb.c
index 316bfe994811..ed853bef19e9 100644
--- a/drivers/video/gbefb.c
+++ b/drivers/video/gbefb.c
@@ -1260,24 +1260,30 @@ static struct device_driver gbefb_driver = {
         .remove = __devexit_p(gbefb_remove),
 };
 
-static struct platform_device gbefb_device = {
-        .name = "gbefb",
-};
+static struct platform_device *gbefb_device;
 
 int __init gbefb_init(void)
 {
         int ret = driver_register(&gbefb_driver);
         if (!ret) {
-                ret = platform_device_register(&gbefb_device);
-                if (ret)
+                gbefb_device = platform_device_alloc("gbefb", 0);
+                if (gbefb_device) {
+                        ret = platform_device_add(gbefb_device);
+                } else {
+                        ret = -ENOMEM;
+                }
+                if (ret) {
+                        platform_device_put(gbefb_device);
                         driver_unregister(&gbefb_driver);
+                }
         }
         return ret;
 }
 
 void __exit gbefb_exit(void)
 {
-         driver_unregister(&gbefb_driver);
+        platform_device_unregister(gbefb_device);
+        driver_unregister(&gbefb_driver);
 }
 
 module_init(gbefb_init);