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Fix crash when setting brightness via Fn keys on ideapads (rhbz 748210)

This commit is contained in:
Josh Boyer 2011-11-03 09:49:33 -04:00
parent 436da03d79
commit 3be61a8c60
2 changed files with 38 additions and 0 deletions
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31
ideapad-Check-if-acpi-already-handle-backlight.patch Normal file
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@ -0,0 +1,31 @@
From d4afc7754a60b885b63ef23fd194984e2d53a4e6 Mon Sep 17 00:00:00 2001
From: Rene Bollford <xsecute@googlemail.com>
Date: Sun, 23 Oct 2011 09:56:42 +0200
Subject: [PATCH] [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>
---
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 0c59541..0d94eec 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;
--
1.7.6.4

7
kernel.spec
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@ -771,6 +771,9 @@ Patch21071: WMI-properly-cleanup-devices-to-avoid-crashes.patch
#rhbz 728607
Patch21060: elantech.patch
#rhbz 748210
Patch21061: ideapad-Check-if-acpi-already-handle-backlight.patch
%endif
BuildRoot: %{_tmppath}/kernel-%{KVERREL}-root
@ -1422,6 +1425,9 @@ ApplyPatch WMI-properly-cleanup-devices-to-avoid-crashes.patch
#rhbz 728607
ApplyPatch elantech.patch
#rhbz 748210
ApplyPatch ideapad-Check-if-acpi-already-handle-backlight.patch
# END OF PATCH APPLICATIONS
%endif
@ -2125,6 +2131,7 @@ fi
%changelog
* Thu Nov 03 2011 Josh Boyer <jwboyer@redhat.com>
- Add commits queued for 3.2 for elantech driver (rhbz 728607)
- Fix crash when setting brightness via Fn keys on ideapads (rhbz 748210)
* Wed Nov 02 2011 Josh Boyer <jwboyer@redhat.com>
- Add patch to fix oops when removing wmi module (rhbz 706574)