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| author | Rene Bollford <xsecute@googlemail.com> | 2011-10-23 09:56:42 +0200 |
|---|---|---|
| committer | Matthew Garrett <mjg@redhat.com> | 2011-10-24 16:52:38 +0200 |
| commit | d4afc7754a60b885b63ef23fd194984e2d53a4e6 (patch) | |
| tree | fc668ab5e445bf04147f51e760f5ce2967481d1b | |
| parent | 1709adab0773616da7a8190f2762e599afb0a295 (diff) | |
| download | linux-3.10-d4afc7754a60b885b63ef23fd194984e2d53a4e6.tar.gz linux-3.10-d4afc7754a60b885b63ef23fd194984e2d53a4e6.tar.bz2 linux-3.10-d4afc7754a60b885b63ef23fd194984e2d53a4e6.zip | |
[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>
| -rw-r--r-- | drivers/platform/x86/ideapad-laptop.c | 2 |
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; |