linux-kernel - [ 37/46] SCSI: mpt2sas: Fix for Driver oops, when loading driver with max_queue_depth command line option to a very small value

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Date:	Wed, 12 Sep 2012 16:39:27 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Sreekanth Reddy <sreekanth.reddy@....com>,
	James Bottomley <JBottomley@...allels.com>
Subject: [ 37/46] SCSI: mpt2sas: Fix for Driver oops, when loading driver with max_queue_depth command line option to a very small value

From: Greg KH <gregkh@...uxfoundation.org>

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "sreekanth.reddy@....com" <sreekanth.reddy@....com>

commit 338b131a3269881c7431234855c93c219b0979b6 upstream.

If the specified max_queue_depth setting is less than the
expected number of internal commands, then driver will calculate
the queue depth size to a negitive number. This negitive number
is actually a very large number because variable is unsigned
16bit integer. So, the driver will ask for a very large amount of
memory for message frames and resulting into oops as memory
allocation routines will not able to handle such a large request.

So, in order to limit this kind of oops, The driver need to set
the max_queue_depth to a scsi mid layer's can_queue value. Then
the overall message frames required for IO is minimum of either
(max_queue_depth plus internal commands) or the IOC global
credits.

Signed-off-by: Sreekanth Reddy <sreekanth.reddy@....com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/mpt2sas/mpt2sas_base.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -2140,10 +2140,13 @@ _base_allocate_memory_pools(struct MPT2S
 	}
 
 	/* command line tunables  for max controller queue depth */
-	if (max_queue_depth != -1)
-		max_request_credit = (max_queue_depth < facts->RequestCredit)
-		    ? max_queue_depth : facts->RequestCredit;
-	else
+	if (max_queue_depth != -1 && max_queue_depth != 0) {
+		max_request_credit = min_t(u16, max_queue_depth +
+			ioc->hi_priority_depth + ioc->internal_depth,
+			facts->RequestCredit);
+		if (max_request_credit > MAX_HBA_QUEUE_DEPTH)
+			max_request_credit =  MAX_HBA_QUEUE_DEPTH;
+	} else
 		max_request_credit = min_t(u16, facts->RequestCredit,
 		    MAX_HBA_QUEUE_DEPTH);
 
@@ -2218,7 +2221,7 @@ _base_allocate_memory_pools(struct MPT2S
 	/* set the scsi host can_queue depth
 	 * with some internal commands that could be outstanding
 	 */
-	ioc->shost->can_queue = ioc->scsiio_depth - (2);
+	ioc->shost->can_queue = ioc->scsiio_depth;
 	dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "scsi host: "
 	    "can_queue depth (%d)\n", ioc->name, ioc->shost->can_queue));
 


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