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zram: retry the device reset instead of dying silently at boot #312

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zram: retry the device reset instead of dying silently at boot #312

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18 changes: 17 additions & 1 deletion meta-opencentauri/recipes-core/zram/files/init
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,23 @@ start() {
modprobe zram num_devices=1
echo "zram devices probed successfully"

echo 1 > /sys/block/zram0/reset
# udev opens the new block device to probe it, and a reset while it is
# open fails with EBUSY. With "set -e" that used to end this script
# silently, before swap was ever enabled. Let udev finish, then retry.
if command -v udevadm >/dev/null 2>&1; then
udevadm settle --timeout=5 || true
fi
tries=0
while ! echo 1 > /sys/block/zram0/reset 2>/dev/null; do
tries=$((tries + 1))
if [ "$tries" -ge 20 ]; then
echo "zram: /sys/block/zram0/reset still busy after $tries tries, giving up"
return 1
fi
sleep 0.25
done
[ "$tries" -gt 0 ] && echo "zram: reset succeeded after $tries retries"

echo lz4 > /sys/block/zram0/comp_algorithm
echo $disksize > /sys/block/zram0/disksize

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