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authorPaul Mackerras <paulus@samba.org>2006-05-19 15:02:42 +1000
committerPaul Mackerras <paulus@samba.org>2006-05-19 15:02:42 +1000
commit3c06da5ae5358e9d325d541a053e1059e9654bcc (patch)
tree04c953cc82fe57cff248ac523095cd4f0d9611a7 /block/ll_rw_blk.c
parent4d1f3f25d9c303d1ce63b42cc94c54ac0ab2e950 (diff)
parenta54c9d30dbb06391ec4422aaf0e1dc2c8c53bd3e (diff)
Merge ../linux-2.6
Diffstat (limited to 'block/ll_rw_blk.c')
-rw-r--r--block/ll_rw_blk.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index e5041a02e21..eac48bec147 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1732,8 +1732,21 @@ void blk_run_queue(struct request_queue *q)
spin_lock_irqsave(q->queue_lock, flags);
blk_remove_plug(q);
- if (!elv_queue_empty(q))
- q->request_fn(q);
+
+ /*
+ * Only recurse once to avoid overrunning the stack, let the unplug
+ * handling reinvoke the handler shortly if we already got there.
+ */
+ if (!elv_queue_empty(q)) {
+ if (!test_and_set_bit(QUEUE_FLAG_REENTER, &q->queue_flags)) {
+ q->request_fn(q);
+ clear_bit(QUEUE_FLAG_REENTER, &q->queue_flags);
+ } else {
+ blk_plug_device(q);
+ kblockd_schedule_work(&q->unplug_work);
+ }
+ }
+
spin_unlock_irqrestore(q->queue_lock, flags);
}
EXPORT_SYMBOL(blk_run_queue);