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Commit b4f6e858 authored by Ben Hutchings's avatar Ben Hutchings Committed by Greg Kroah-Hartman
Browse files

test_firmware: fix setting old custom fw path back on exit, second try 



commit e538409257d0217a9bc715686100a5328db75a15 upstream.

Commit 65c79230576 tried to clear the custom firmware path on exit by
writing a single space to the firmware_class.path parameter.  This
doesn't work because nothing strips this space from the value stored
and fw_get_filesystem_firmware() only ignores zero-length paths.

Instead, write a null byte.

Fixes: 0a8adf58 ("test: add firmware_class loader test")
Fixes: 65c79230576 ("test_firmware: fix setting old custom fw path back on exit")
Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
Acked-by: default avatarLuis R. Rodriguez <mcgrof@kernel.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 43b3ba6e

tools/testing/selftests/firmware/fw_filesystem.sh

+4 −2
Original line number Diff line number Diff line
@@ -46,9 +46,11 @@ test_finish() 
		echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout

	fi

	if [ "$OLD_FWPATH" = "" ]; then

		OLD_FWPATH=" "

	fi

		# A zero-length write won't work; write a null byte

		printf '\000' >/sys/module/firmware_class/parameters/path

	else

		echo -n "$OLD_FWPATH" >/sys/module/firmware_class/parameters/path

	fi

	rm -f "$FW"

	rmdir "$FWPATH"

}