On Mon, Oct 30 2006, Mark Lord wrote:
> (gdb) l *cfq_set_request+0x33e
> 0xc021780e is in cfq_set_request (block/cfq-iosched.c:1224).
> 1219 if (unlikely(!cfqd))
> 1220 return;
> 1221
> 1222 spin_lock(cfqd->queue->queue_lock);
> 1223
> 1224 cfqq = cic->cfqq[ASYNC];
> 1225 if (cfqq) {
> 1226 struct cfq_queue *new_cfqq;
> 1227 new_cfqq = cfq_get_queue(cfqd, CFQ_KEY_ASYNC,
> cic->ioc->task,
> 1228 GFP_ATOMIC);
Bingo, that's a lot better! So that's the real bug, I'm guessing this
got introduced when the ioprio stuff got juggled around recently. Pretty
straight forward, this should fix it for you.
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d3d7613..25c4e7e 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1215,11 +1215,12 @@ static inline void changed_ioprio(struct
{
struct cfq_data *cfqd = cic->key;
struct cfq_queue *cfqq;
+ unsigned long flags;
if (unlikely(!cfqd))
return;
- spin_lock(cfqd->queue->queue_lock);
+ spin_lock_irqsave(cfqd->queue->queue_lock, flags);
cfqq = cic->cfqq[ASYNC];
if (cfqq) {
@@ -1236,7 +1237,7 @@ static inline void changed_ioprio(struct
if (cfqq)
cfq_mark_cfqq_prio_changed(cfqq);
- spin_unlock(cfqd->queue->queue_lock);
+ spin_unlock_irqrestore(cfqd->queue->queue_lock, flags);
}
static void cfq_ioc_set_ioprio(struct io_context *ioc)
--
Jens Axboe
-
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