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authorRene Bollford <xsecute@googlemail.com>2011-10-23 09:56:42 +0200
committerMatthew Garrett <mjg@redhat.com>2011-10-24 16:52:38 +0200
commitd4afc7754a60b885b63ef23fd194984e2d53a4e6 (patch)
treefc668ab5e445bf04147f51e760f5ce2967481d1b /drivers/platform
parent1709adab0773616da7a8190f2762e599afb0a295 (diff)
[PATCH] ideapad: Check if acpi already handle backlight power to avoid a page fault
This patch avoid a page fault in the ideapad-laptop extras when turning the backlight power on or off. Signed-off-by: Rene Bolldorf <xsecute@googlemail.com> Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/ideapad-laptop.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 0c595410e78..0d94eec00f4 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -493,6 +493,8 @@ static void ideapad_backlight_notify_power(struct ideapad_private *priv)
unsigned long power;
struct backlight_device *blightdev = priv->blightdev;
+ if (!blightdev)
+ return;
if (read_ec_data(ideapad_handle, 0x18, &power))
return;
blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;