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[PATCH] CFQ: use irq safe locking in cfq_cic_link() 

If cfq_set_request() is called for a new process AND a non-fs io
request (so that __GFP_WAIT may not be set), cfq_cic_link() may
use spin_lock_irq() and spin_unlock_irq() with interrupts already
disabled.

Fix is to always use irq safe locking in cfq_cic_link()

Acked-By: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jens Axboe 2006-10-30 19:07:48 +01:00 committed by Linus Torvalds
parent 209ad53bc1
commit 0261d6886e
1 changed files with 3 additions and 2 deletions
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5
block/cfq-iosched.c
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@ -1362,6 +1362,7 @@ cfq_cic_link(struct cfq_data *cfqd, struct io_context *ioc,
struct rb_node **p;
struct rb_node *parent;
struct cfq_io_context *__cic;
unsigned long flags;
void *k;
cic->ioc = ioc;
@ -1391,9 +1392,9 @@ restart:
rb_link_node(&cic->rb_node, parent, p);
rb_insert_color(&cic->rb_node, &ioc->cic_root);
spin_lock_irq(cfqd->queue->queue_lock);
spin_lock_irqsave(cfqd->queue->queue_lock, flags);
list_add(&cic->queue_list, &cfqd->cic_list);
spin_unlock_irq(cfqd->queue->queue_lock);
spin_unlock_irqrestore(cfqd->queue->queue_lock, flags);
}
/*