Hi Matthew,
this patch avoid a page fault in the ideapad-laptop extras when
turning the backlight power on or off.
Signed-off-by: Rene Bolldorf <xsec...@googlemail.com>
---
diff --git a/drivers/platform/x86/ideapad-laptop.c
b/drivers/platform/x86/ideapad-laptop.c
index 0c59541..0766a9f 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -491,11 +491,13 @@ static void ideapad_backlight_exit(struct
ideapad_private *priv)
static void ideapad_backlight_notify_power(struct ideapad_private *priv)
{
unsigned long power;
- struct backlight_device *blightdev = priv->blightdev;
- if (read_ec_data(ideapad_handle, 0x18, &power))
+ if (priv->blightdev == NULL) {
+ read_ec_data(ideapad_handle, 0x18, &power);
return;
- blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
+ }
+
+ priv->blightdev->props.power = power ? FB_BLANK_UNBLANK :
FB_BLANK_POWERDOWN;
}
static void ideapad_backlight_notify_brightness(struct ideapad_private *priv)
--
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