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author <axboe@suse.de>2005-04-12 16:22:06 -0500
committerJames Bottomley <jejb@titanic>2005-04-16 20:10:09 -0500
commit152587deb8903c0edf483a5b889f975bc6bea7e0 (patch)
tree62fc13bff0a28134adbb523ed1a2c0efdd9a85cb /drivers/block/ll_rw_blk.c
parent56fece20086ebe32bce2c0d74ceadd516b56baae (diff)
[PATCH] fix NMI lockup with CFQ scheduler
The current problem seen is that the queue lock is actually in the SCSI device structure, so when that structure is freed on device release, we go boom if the queue tries to access the lock again. The fix here is to move the lock from the scsi_device to the queue. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/block/ll_rw_blk.c')
-rw-r--r--drivers/block/ll_rw_blk.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c
index 46e54b44166..11ef9d9ea13 100644
--- a/drivers/block/ll_rw_blk.c
+++ b/drivers/block/ll_rw_blk.c
@@ -1715,6 +1715,15 @@ request_queue_t *blk_init_queue(request_fn_proc *rfn, spinlock_t *lock)
if (blk_init_free_list(q))
goto out_init;
+ /*
+ * if caller didn't supply a lock, they get per-queue locking with
+ * our embedded lock
+ */
+ if (!lock) {
+ spin_lock_init(&q->__queue_lock);
+ lock = &q->__queue_lock;
+ }
+
q->request_fn = rfn;
q->back_merge_fn = ll_back_merge_fn;
q->front_merge_fn = ll_front_merge_fn;