svn commit: r241749 - stable/9/sys/cam

[Alexander Motin]

Author: mav
Date: Fri Oct 19 19:27:33 2012
New Revision: 241749
URL: http://svn.freebsd.org/changeset/base/241749

Log:
  MFC r241444:
  Increase device CCB queue array size by CAM_RL_VALUES - 1 (4) elements.
  It is required to store extra recovery requests in case of bus resets.
  On ATA/SATA this fixes assertion panics on HEAD with INVARIANTS enabled or
  possible memory corruptions otherwise if timeout/reset happens when device
  CCB queue is already full.

Modified:
  stable/9/sys/cam/cam_queue.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/cam/cam_queue.c
==============================================================================
--- stable/9/sys/cam/cam_queue.c	Fri Oct 19 19:17:43 2012	(r241748)
+++ stable/9/sys/cam/cam_queue.c	Fri Oct 19 19:27:33 2012	(r241749)
@@ -316,7 +316,8 @@ cam_ccbq_resize(struct cam_ccbq *ccbq, i
 	 * same size once the outstanding entries have been processed.
 	 */
 	if (space_left < 0
-	 || camq_resize(&ccbq->queue, new_size) == CAM_REQ_CMP) {
+	 || camq_resize(&ccbq->queue, new_size + (CAM_RL_VALUES - 1)) ==
+	    CAM_REQ_CMP) {
 		ccbq->devq_openings += delta;
 		ccbq->dev_openings += delta;
 		return (CAM_REQ_CMP);
@@ -329,7 +330,7 @@ int
 cam_ccbq_init(struct cam_ccbq *ccbq, int openings)
 {
 	bzero(ccbq, sizeof(*ccbq));
-	if (camq_init(&ccbq->queue, openings) != 0) {
+	if (camq_init(&ccbq->queue, openings + (CAM_RL_VALUES - 1)) != 0) {
 		return (1);
 	}
 	ccbq->devq_openings = openings;