[for-4.4.y,4/4] tools: firmware: check for distro fallback udev cancel rule

Message ID 1510170852-32052-5-git-send-email-amit.pundir@linaro.org
State New
Headers show
  • selftests: firmware: fix mainline test runs
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Commit Message

Amit Pundir Nov. 8, 2017, 7:54 p.m.
From: "Luis R. Rodriguez" <mcgrof@kernel.org>

commit afb999cdef69148f366839e74470d8f5375ba5f1 upstream.

Some distributions (Debian, OpenSUSE) have a udev rule in place to cancel
all fallback mechanism uevents immediately. This would obviously
make it hard to test against the fallback mechanism test interface,
so we need to check for this.

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>

 tools/testing/selftests/firmware/fw_userhelper.sh | 28 +++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)



diff --git a/tools/testing/selftests/firmware/fw_userhelper.sh b/tools/testing/selftests/firmware/fw_userhelper.sh
index b9983f8e09f6..01c626a1f226 100755
--- a/tools/testing/selftests/firmware/fw_userhelper.sh
+++ b/tools/testing/selftests/firmware/fw_userhelper.sh
@@ -64,9 +64,33 @@  trap "test_finish" EXIT
 echo "ABCD0123" >"$FW"
 NAME=$(basename "$FW")
 # Test failure when doing nothing (timeout works).
-echo 1 >/sys/class/firmware/timeout
-echo -n "$NAME" >"$DIR"/trigger_request
+echo -n 2 >/sys/class/firmware/timeout
+echo -n "nope-$NAME" >"$DIR"/trigger_request 2>/dev/null &
+# Give the kernel some time to load the loading file, must be less
+# than the timeout above.
+sleep 1
+if [ ! -f $DEVPATH ]; then
+	echo "$0: fallback mechanism immediately cancelled"
+	echo ""
+	echo "The file never appeared: $DEVPATH"
+	echo ""
+	echo "This might be a distribution udev rule setup by your distribution"
+	echo "to immediately cancel all fallback requests, this must be"
+	echo "removed before running these tests. To confirm look for"
+	echo "a firmware rule like /lib/udev/rules.d/50-firmware.rules"
+	echo "and see if you have something like this:"
+	echo ""
+	echo "SUBSYSTEM==\"firmware\", ACTION==\"add\", ATTR{loading}=\"-1\""
+	echo ""
+	echo "If you do remove this file or comment out this line before"
+	echo "proceeding with these tests."
+	exit 1
 if diff -q "$FW" /dev/test_firmware >/dev/null ; then
 	echo "$0: firmware was not expected to match" >&2
 	exit 1