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tools: firmware: check for distro fallback udev cancel rule

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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>
This commit is contained in:
Luis R. Rodriguez 2017-01-23 08:11:07 -08:00 committed by Greg Kroah-Hartman
parent 083a93b0c1
commit afb999cdef
1 changed files with 26 additions and 2 deletions
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28
tools/testing/selftests/firmware/fw_userhelper.sh
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@ -64,9 +64,33 @@ trap "test_finish" EXIT
echo "ABCD0123" >"$FW"
NAME=$(basename "$FW")
DEVPATH="$DIR"/"nope-$NAME"/loading
# Test failure when doing nothing (timeout works).
echo 1 >/sys/class/firmware/timeout
echo -n "$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: $DEVPATH"
echo ""
echo "This might be a distribution udev rule setup by your distribution"
echo "to immediately cancel all fallback requests, this must be"
echo "removed before running these tests. To confirm look for"
echo "a firmware rule like /lib/udev/rules.d/50-firmware.rules"
echo "and see if you have something like this:"
echo ""
echo "SUBSYSTEM==\"firmware\", ACTION==\"add\", ATTR{loading}=\"-1\""
echo ""
echo "If you do remove this file or comment out this line before"
echo "proceeding with these tests."
exit 1
fi
if diff -q "$FW" /dev/test_firmware >/dev/null ; then
echo "$0: firmware was not expected to match" >&2
exit 1