Patch "platform/x86: fujitsu-laptop: Don't oops when FUJ02E3 is not presnt" has been added to the 4.13-stable tree

This is a note to let you know that I've just added the patch titled

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

to the 4.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
platform-x86-fujitsu-laptop-don-t-oops-when-fuj02e3-is-not-presnt.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <[email protected]>
Date: Mon, 18 Sep 2017 23:00:59 +0300
Subject: platform/x86: fujitsu-laptop: Don't oops when FUJ02E3 is not presnt
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From: Ville Syrjälä <[email protected]>

commit ce7c47d60bda6c7f09ccf16e978d971c8fa16ff0 upstream.

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.

---
 drivers/platform/x86/fujitsu-laptop.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

@@ -254,10 +254,12 @@ static int bl_update_status(struct backl
 {
 	struct acpi_device *device = bl_get_data(b);
 
-	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);
+	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);
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.13/platform-x86-fujitsu-laptop-don-t-oops-when-fuj02e3-is-not-presnt.patch