Patch "test_firmware: fix setting old custom fw path back on exit" has been added to the 4.15-stable tree

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

test_firmware: fix setting old custom fw path back on exit

to the 4.15-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:
test_firmware-fix-setting-old-custom-fw-path-back-on-exit.patch
and it can be found in the queue-4.15 subdirectory.

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

From: "Luis R. Rodriguez" <[email protected]>
Date: Mon, 20 Nov 2017 09:45:35 -0800
Subject: test_firmware: fix setting old custom fw path back on exit

From: "Luis R. Rodriguez" <[email protected]>

[ Upstream commit 65c79230576873b312c3599479c1e42355c9f349 ]

The file /sys/module/firmware_class/parameters/path can be used to set a custom firmware path. The fw_filesystem.sh script creates a temporary directory to add a test firmware file to be used during testing, in order for this to work it uses the custom path syfs file and it was supposed to reset back the file on execution exit. The script failed to do this due to a typo, it was using OLD_PATH instead of OLD_FWPATH, since its inception since v3.17.

Its not as easy to just keep the old setting, it turns out that resetting an empty setting won't actually do what we want, we need to check if it was empty and set an empty space.

Without this we end up having the temporary path always set after we run these tests.

---
 tools/testing/selftests/firmware/fw_filesystem.sh |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

@@ -45,7 +45,10 @@ test_finish()
 	if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
 		echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
 	fi
-	echo -n "$OLD_PATH" >/sys/module/firmware_class/parameters/path
+	if [ "$OLD_FWPATH" = "" ]; then
+		OLD_FWPATH=" "
+	fi
+	echo -n "$OLD_FWPATH" >/sys/module/firmware_class/parameters/path
 	rm -f "$FW"
 	rmdir "$FWPATH"
 }

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

queue-4.15/test_firmware-fix-setting-old-custom-fw-path-back-on-exit.patch