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Merge pull request #639 from jpoimboe/activeness-safety-retry

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kpatch: retry kpatch load on failure
This commit is contained in:
Jessica Yu 2016-12-16 16:35:34 -08:00 committed by GitHub
commit dd8d03ba9b
1 changed files with 27 additions and 5 deletions
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32
kpatch/kpatch
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@ -136,6 +136,8 @@ verify_module_checksum () {
}
load_module () {
local module="$1"
if ! core_module_loaded; then
if modprobe -q kpatch; then
echo "loaded core module"
@ -146,11 +148,11 @@ load_module () {
fi
fi
modname=$(get_module_name $1)
moddir=/sys/kernel/kpatch/patches/$modname
local modname=$(get_module_name $module)
local moddir=/sys/kernel/kpatch/patches/$modname
if [[ -d $moddir ]] ; then
if [[ $(cat "${moddir}/enabled") -eq 0 ]]; then
if verify_module_checksum $1; then # same checksum
if verify_module_checksum $module; then # same checksum
echo "module already loaded, re-enabling"
echo 1 > ${moddir}/enabled || die "failed to re-enable module $modname"
return
@ -162,8 +164,28 @@ load_module () {
fi
fi
echo "loading patch module: $1"
insmod "$1" "$2"
echo "loading patch module: $module"
local i=0
while true; do
out=$(insmod "$module" 2>&1)
[[ -z $out ]] && break
echo $out 1>&2
[[ ! $out =~ "Device or resource busy" ]] &&
die "failed to load module $module"
# "Device or resource busy" means the activeness safety check
# failed. Retry in a few seconds.
i=$((i+1))
if [[ $i = 5 ]]; then
die "failed to load module $module"
break
else
warn "retrying..."
sleep 2
fi
done
return 0
}
unload_module () {