diff options
| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2009-08-08 09:26:25 +0200 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-08-30 04:58:19 +0200 |
| commit | 4b4fe3b62e8d88068083218d3e42c45223b51d29 (patch) | |
| tree | 6d08c8117fc004da8bae7312a3715f1c11ef3ced /drivers/acpi/video.c | |
| parent | ACPI video: ignore buggy _BQC (diff) | |
| download | linux-4b4fe3b62e8d88068083218d3e42c45223b51d29.tar.xz linux-4b4fe3b62e8d88068083218d3e42c45223b51d29.zip | |
ACPI: video - fix potential crash when unloading
thermal_cooling_device_register() returns error encoded in a pointer
when it fails in which case we need to explictly set device->cdev
to NULL so we don't try to unregister it when unloading.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/video.c')
| -rw-r--r-- | drivers/acpi/video.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 2020907921cc..aab385188599 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -997,8 +997,18 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device) device->cdev = thermal_cooling_device_register("LCD", device->dev, &video_cooling_ops); - if (IS_ERR(device->cdev)) + if (IS_ERR(device->cdev)) { + /* + * Set cdev to NULL so we don't crash trying to + * free it. + * Also, why the hell we are returning early and + * not attempt to register video output if cooling + * device registration failed? + * -- dtor + */ + device->cdev = NULL; return; + } dev_info(&device->dev->dev, "registered as cooling_device%d\n", device->cdev->id); |