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authorKashyap, Desai <kashyap.desai@lsi.com>2011-01-04 01:04:57 -0500
committerJames Bottomley <James.Bottomley@suse.de>2011-01-24 10:22:24 -0500
commit11e1b961ab067ee3acaf723531da4d3f23e1d6f7 (patch)
treeb7dd47b2e399555d43abffbc75307c3981f85343 /drivers/scsi
parentefe82a16bc0f9f9e1fc8fa706eb0309fcd57770a (diff)
[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>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/mpt2sas/mpt2sas_base.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index b2a817055b8b..a11ac6701043 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -2176,9 +2176,9 @@ _base_allocate_memory_pools(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
2176 /* adjust hba_queue_depth, reply_free_queue_depth, 2176 /* adjust hba_queue_depth, reply_free_queue_depth,
2177 * and queue_size 2177 * and queue_size
2178 */ 2178 */
2179 ioc->hba_queue_depth -= queue_diff; 2179 ioc->hba_queue_depth -= (queue_diff / 2);
2180 ioc->reply_free_queue_depth -= queue_diff; 2180 ioc->reply_free_queue_depth -= (queue_diff / 2);
2181 queue_size -= queue_diff; 2181 queue_size = facts->MaxReplyDescriptorPostQueueDepth;
2182 } 2182 }
2183 ioc->reply_post_queue_depth = queue_size; 2183 ioc->reply_post_queue_depth = queue_size;
2184 2184