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authorVictor Lowther <victor.lowther@gmail.com>2010-06-09 05:23:57 -0500
committerVictor Lowther <victor.lowther@gmail.com>2010-06-09 05:38:24 -0500
commite2ea60907ca2b30e1ac5744d3e17dff16ed910ce (patch)
tree975016144dd301b2f5b7f524258b3c8e498fb49b /pm
parent4eaf130c73b3234ed980866ce54a311407accf36 (diff)
Refuse to change sata link pm states on kernels < 2.6.33
Kernels earlier then 2.6.33 have a bug that can cause filesystem corruption due to the upper layers aborting a transaction instead of retrying it if the sata link glitches out momentarily during a power state transition.
Diffstat (limited to 'pm')
-rw-r--r--pm/power.d/sata_alpm4
1 files changed, 4 insertions, 0 deletions
diff --git a/pm/power.d/sata_alpm b/pm/power.d/sata_alpm
index 82c8201..6391e09 100644
--- a/pm/power.d/sata_alpm
+++ b/pm/power.d/sata_alpm
@@ -22,6 +22,10 @@ EOF
}
set_sata_alpm() {
+ # see kernel commit 6013efd8860bf15c1f86f365332642cfe557152f
+ kv="$(uname -r)"
+ [ "$kv" ] || exit $NA #for paranoia's sake
+ [ "${kv%-*}" \< "2.6.33" ] && exit $NA # avoid fs corruption
for f in /sys/class/scsi_host/host*/link_power_management_policy; do
[ -w "$f" ] || continue
echo "$1" > "$f"