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SubjectRe: [PATCH] [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>

diff --git a/drivers/video/gbefb.c b/drivers/video/gbefb.c
--- a/drivers/video/gbefb.c
+++ b/drivers/video/gbefb.c
@@ -1254,17 +1254,22 @@ 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;
}
@@ -1271,7 +1276,8 @@ int __init gbefb_init(void)

void __exit gbefb_exit(void)
{
- driver_unregister(&gbefb_driver);
+ platform_device_unregister(gbefb_device);
+ driver_unregister(&gbefb_driver);
}

module_init(gbefb_init);

--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
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