From 98a3c781057fa43494e7e8b39d639e93fca0ecbf Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Thu, 31 Aug 2006 14:04:34 +1000 Subject: [PATCH] fbdev: Fix crashes in various fbdev's blank routines The backlight changes that went in had a bug where they could cause the kernel to access an unitialized pointer when blanking if there is no backlight control on a machine. The bug affects atyfb, aty128fb, nvidiafb and rivafb. radeonfb seems to be ok. This fixes it. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Linus Torvalds --- drivers/video/aty/aty128fb.c | 5 ++++- drivers/video/aty/atyfb_base.c | 5 ++++- 2 files changed, 8 insertions(+), 2 deletions(-) (limited to 'drivers/video/aty') diff --git a/drivers/video/aty/aty128fb.c b/drivers/video/aty/aty128fb.c index 3e827e0..106d428 100644 --- a/drivers/video/aty/aty128fb.c +++ b/drivers/video/aty/aty128fb.c @@ -1800,6 +1800,9 @@ static struct backlight_properties aty128_bl_data = { static void aty128_bl_set_power(struct fb_info *info, int power) { + if (info->bl_dev == NULL) + return; + mutex_lock(&info->bl_mutex); up(&info->bl_dev->sem); info->bl_dev->props->power = power; @@ -1828,7 +1831,7 @@ static void aty128_bl_init(struct aty128fb_par *par) bd = backlight_device_register(name, par, &aty128_bl_data); if (IS_ERR(bd)) { info->bl_dev = NULL; - printk("aty128: Backlight registration failed\n"); + printk(KERN_WARNING "aty128: Backlight registration failed\n"); goto error; } diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c index 053ff63..510e4ea 100644 --- a/drivers/video/aty/atyfb_base.c +++ b/drivers/video/aty/atyfb_base.c @@ -2199,6 +2199,9 @@ static struct backlight_properties aty_bl_data = { static void aty_bl_set_power(struct fb_info *info, int power) { + if (info->bl_dev == NULL) + return; + mutex_lock(&info->bl_mutex); up(&info->bl_dev->sem); info->bl_dev->props->power = power; @@ -2223,7 +2226,7 @@ static void aty_bl_init(struct atyfb_par *par) bd = backlight_device_register(name, par, &aty_bl_data); if (IS_ERR(bd)) { info->bl_dev = NULL; - printk("aty: Backlight registration failed\n"); + printk(KERN_WARNING "aty: Backlight registration failed\n"); goto error; } -- cgit v1.1