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[PATCH] blk_start_queue() must be called with irq disabled - add warning

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The queue lock can be taken from interrupts so it must always be taken with
irq disabling primitives.  Some primitives already verify this.
blk_start_queue() is called under this lock, so interrupts must be
disabled.

Also document this requirement clearly in blk_init_queue(), where the queue
spinlock is set.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2006-06-05 12:09:01 +02:00 committed by Jens Axboe
parent bae386f788
commit a038e25364
1 changed files with 4 additions and 1 deletions
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5
block/ll_rw_blk.c
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@ -1663,6 +1663,8 @@ static void blk_unplug_timeout(unsigned long data)
**/
void blk_start_queue(request_queue_t *q)
{
WARN_ON(!irqs_disabled());
clear_bit(QUEUE_FLAG_STOPPED, &q->queue_flags);
/*
@ -1878,7 +1880,8 @@ EXPORT_SYMBOL(blk_alloc_queue_node);
* get dealt with eventually.
*
* The queue spin lock must be held while manipulating the requests on the
* request queue.
* request queue; this lock will be taken also from interrupt context, so irq
* disabling is needed for it.
*
* Function returns a pointer to the initialized request queue, or NULL if
* it didn't succeed.