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authorDean Nelson <dcn@sgi.com>2009-01-15 13:50:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-15 16:39:37 -0800
commit158bc69effbf96f59c01cdeb20f8d4c184e59f8e (patch)
tree001dc5f61d6b08445c7e1676468c1bcaa7788921
parentcafa1d8b0c90252e73f20db1b6f32cf88e73ff17 (diff)
sgi-xp: eliminate false detection of no heartbeat
After XPC has been up and running on multiple partitions for any length of time, if XPC on one of the partitions is stopped and restarted (either by a rmmod/insmod or a system restart), it is possible for the XPCs running on the other partitions to falsely detect a lack of heartbeat from the XPC that was just restarted. This false detection will occur if the restarted XPC comes up within the five-seconds preceding one of the other XPC's heartbeat check (which occurs once every twenty seconds). The detection of no heartbeat results in the detecting XPC deactivating from the just restarted XPC. The only remedy is to restart one of the XPCs and hope that one doesn't hit this five-second window on any of the other partitions. Signed-off-by: Dean Nelson <dcn@sgi.com> Signed-off-by: Robin Holt <holt@sgi.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/misc/sgi-xp/xpc_sn2.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/misc/sgi-xp/xpc_sn2.c b/drivers/misc/sgi-xp/xpc_sn2.c
index 73b7fb8de47..82fb9958f22 100644
--- a/drivers/misc/sgi-xp/xpc_sn2.c
+++ b/drivers/misc/sgi-xp/xpc_sn2.c
@@ -899,7 +899,7 @@ xpc_update_partition_info_sn2(struct xpc_partition *part, u8 remote_rp_version,
dev_dbg(xpc_part, " remote_vars_pa = 0x%016lx\n",
part_sn2->remote_vars_pa);
- part->last_heartbeat = remote_vars->heartbeat;
+ part->last_heartbeat = remote_vars->heartbeat - 1;
dev_dbg(xpc_part, " last_heartbeat = 0x%016lx\n",
part->last_heartbeat);