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authorStefan Richter <stefanr@s5r6.in-berlin.de>2008-11-29 14:55:47 +0100
committerStefan Richter <stefanr@s5r6.in-berlin.de>2008-11-29 17:07:56 +0100
commit2642b11295ebcc94843045933061bfbb263fce7f (patch)
treeaa62e749e88e0d769d2d557d4a067168108943f1 /drivers/ieee1394/sbp2.c
parente47c1feb17e61ef4e2f245c0af0c5a8e2a7798b2 (diff)
ieee1394: sbp2: fix race condition in state change
An intermediate transition from _RUNNING to _IN_SHUTDOWN could have been missed by the former code. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/ieee1394/sbp2.c')
-rw-r--r--drivers/ieee1394/sbp2.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index 3f5dbcb21605..a373c18cf7b8 100644
--- a/drivers/ieee1394/sbp2.c
+++ b/drivers/ieee1394/sbp2.c
@@ -895,12 +895,13 @@ static void sbp2_host_reset(struct hpsb_host *host)
return;
read_lock_irqsave(&sbp2_hi_logical_units_lock, flags);
+
list_for_each_entry(lu, &hi->logical_units, lu_list)
- if (likely(atomic_read(&lu->state) !=
- SBP2LU_STATE_IN_SHUTDOWN)) {
- atomic_set(&lu->state, SBP2LU_STATE_IN_RESET);
+ if (atomic_cmpxchg(&lu->state,
+ SBP2LU_STATE_RUNNING, SBP2LU_STATE_IN_RESET)
+ == SBP2LU_STATE_RUNNING)
scsi_block_requests(lu->shost);
- }
+
read_unlock_irqrestore(&sbp2_hi_logical_units_lock, flags);
}