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platform/x86: fujitsu-laptop: Don't oops when FUJ02E3 is not presnt

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My Fujitsu-Siemens Lifebook S6120 doesn't have the FUJ02E3 device,
but it does have FUJ02B1. That means we do register the backlight
device (and it even seems to work), but the code will oops as soon
as we try to set the backlight brightness because it's trying to
call call_fext_func() with a NULL device. Let's just skip those
function calls when the FUJ02E3 device is not present.

Cc: Jonathan Woithe <jwoithe@just42.net>
Cc: Andy Shevchenko <andy@infradead.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: <stable@vger.kernel.org> # 4.13.x
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
This commit is contained in:
Ville Syrjälä 2017-09-18 23:00:59 +03:00 committed by Darren Hart (VMware)
parent 2bd6bf03f4
commit ce7c47d60b
1 changed files with 6 additions and 4 deletions
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2
drivers/platform/x86/fujitsu-laptop.c
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@ -254,10 +254,12 @@ static int bl_update_status(struct backlight_device *b)
{
struct acpi_device *device = bl_get_data(b);
if (fext) {
if (b->props.power == FB_BLANK_POWERDOWN)
call_fext_func(fext, FUNC_BACKLIGHT, 0x1, 0x4, 0x3);
else
call_fext_func(fext, FUNC_BACKLIGHT, 0x1, 0x4, 0x0);
}
return set_lcd_level(device, b->props.brightness);
}