diff options
author | Paul Mackerras <paulus@samba.org> | 2006-05-19 15:02:42 +1000 |
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committer | Paul Mackerras <paulus@samba.org> | 2006-05-19 15:02:42 +1000 |
commit | 3c06da5ae5358e9d325d541a053e1059e9654bcc (patch) | |
tree | 04c953cc82fe57cff248ac523095cd4f0d9611a7 /block/ll_rw_blk.c | |
parent | 4d1f3f25d9c303d1ce63b42cc94c54ac0ab2e950 (diff) | |
parent | a54c9d30dbb06391ec4422aaf0e1dc2c8c53bd3e (diff) |
Merge ../linux-2.6
Diffstat (limited to 'block/ll_rw_blk.c')
-rw-r--r-- | block/ll_rw_blk.c | 17 |
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); |