X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=drivers%2Facpi%2Fvideo.c;h=d10668f146997d07c53630b722d15fad2054ed98;hb=bc61b0102a53ee0ced3a8747cd4afe656a453756;hp=f051b151580d7de14647213f6c4497a75a4eff57;hpb=dad2ad82c5f058367df79de022bd12d36afcd065;p=powerpc.git

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index f051b15158..d10668f146 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -812,7 +812,7 @@ acpi_video_device_write_brightness(struct file *file,
 
 	ACPI_FUNCTION_TRACE("acpi_video_device_write_brightness");
 
-	if (!dev || count + 1 > sizeof str)
+	if (!dev || !dev->brightness || count + 1 > sizeof str)
 		return_VALUE(-EINVAL);
 
 	if (copy_from_user(str, buffer, count))