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test_firmware: add test case for SIGCHLD on sync fallback

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It has been reported that SIGCHLD will trigger an immediate abort
on sync firmware requests which rely on the sysfs interface for a
trigger. This is unexpected behaviour, this reproduces this issue.

This test case currenty fails.

Reported-by: Martin Fuzzey <mfuzzey@parkeon.com>
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 2017-07-20 13:13:38 -07:00 committed by Greg Kroah-Hartman
parent 1f5000bd8a
commit 0d1f417eee
1 changed files with 31 additions and 0 deletions
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31
tools/testing/selftests/firmware/fw_fallback.sh
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@ -134,6 +134,27 @@ load_fw_custom_cancel()
wait
}
load_fw_fallback_with_child()
{
local name="$1"
local file="$2"
# This is the value already set but we want to be explicit
echo 4 >/sys/class/firmware/timeout
sleep 1 &
SECONDS_BEFORE=$(date +%s)
echo -n "$name" >"$DIR"/trigger_request 2>/dev/null
SECONDS_AFTER=$(date +%s)
SECONDS_DELTA=$(($SECONDS_AFTER - $SECONDS_BEFORE))
if [ "$SECONDS_DELTA" -lt 4 ]; then
RET=1
else
RET=0
fi
wait
return $RET
}
trap "test_finish" EXIT
@ -221,4 +242,14 @@ else
echo "$0: cancelling custom fallback mechanism works"
fi
set +e
load_fw_fallback_with_child "nope-signal-$NAME" "$FW"
if [ "$?" -eq 0 ]; then
echo "$0: SIGCHLD on sync ignored as expected" >&2
else
echo "$0: error - sync firmware request cancelled due to SIGCHLD" >&2
exit 1
fi
set -e
exit 0