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[SCSI] mpt2sas: Correct resizing calculation for max_queue_depth 

The ioc->hba_queue_depth is not properly resized when the controller
firmware reports that it supports more outstanding IO than what can be fit
inside the reply descriptor pool depth. This is reproduced by setting the
controller global credits larger than 30,000. The bug results in an
incorrect sizing of the queues. The fix is to resize the queue_size by
dividing queue_diff by two.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Kashyap, Desai 2011-01-04 11:34:57 +05:30 committed by James Bottomley
parent efe82a16bc
commit 11e1b961ab
1 changed files with 3 additions and 3 deletions
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6
drivers/scsi/mpt2sas/mpt2sas_base.c
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@ -2176,9 +2176,9 @@ _base_allocate_memory_pools(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
/* adjust hba_queue_depth, reply_free_queue_depth,
* and queue_size
*/
ioc->hba_queue_depth -= queue_diff;
ioc->reply_free_queue_depth -= queue_diff;
queue_size -= queue_diff;
ioc->hba_queue_depth -= (queue_diff / 2);
ioc->reply_free_queue_depth -= (queue_diff / 2);
queue_size = facts->MaxReplyDescriptorPostQueueDepth;
}
ioc->reply_post_queue_depth = queue_size;