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authorJens Axboe <jens.axboe@oracle.com>2006-10-30 19:07:48 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-30 10:21:58 -0800
commit0261d6886eb5822867a5310dc1e4479b940a1942 (patch)
treee1abc43a23dce3a2250eed8732e68fd6e8a92053 /block/cfq-iosched.c
parent209ad53bc19667a128d9c51beba873a5c62bff6e (diff)
downloadlinux-2.6.34-ux500-0261d6886eb5822867a5310dc1e4479b940a1942.tar.gz
[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>
Diffstat (limited to 'block/cfq-iosched.c')
-rw-r--r--block/cfq-iosched.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d3d76136f53..5c3da894a56 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -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);
}
/*