[Midnightbsd-cvs] src [8750] trunk/sys/cam: XPT_DEV_MATCH is probably the only xpt_action() method that is called without holding SIM lock.

[laffer1 at midnightbsd.org]

Revision: 8750
          http://svnweb.midnightbsd.org/src/?rev=8750
Author:   laffer1
Date:     2016-09-25 22:35:36 -0400 (Sun, 25 Sep 2016)
Log Message:
-----------
XPT_DEV_MATCH is probably the only xpt_action() method that is called without holding SIM lock.

Modified Paths:
--------------
    trunk/sys/cam/cam_xpt.c
    trunk/sys/cam/scsi/scsi_enc_ses.c

Modified: trunk/sys/cam/cam_xpt.c
===================================================================
--- trunk/sys/cam/cam_xpt.c	2016-09-26 02:34:48 UTC (rev 8749)
+++ trunk/sys/cam/cam_xpt.c	2016-09-26 02:35:36 UTC (rev 8750)
@@ -582,7 +582,9 @@
 			/*
 			 * This is an immediate CCB, we can send it on directly.
 			 */
+			CAM_SIM_LOCK(xpt_path_sim(xpt_periph->path));
 			xpt_action(inccb);
+			CAM_SIM_UNLOCK(xpt_path_sim(xpt_periph->path));
 
 			/*
 			 * Map the buffers back into user space.
@@ -2815,6 +2817,11 @@
 				position_type = CAM_DEV_POS_PDRV;
 		}
 
+		/*
+		 * Note that we drop the SIM lock here, because the EDT
+		 * traversal code needs to do its own locking.
+		 */
+		CAM_SIM_UNLOCK(xpt_path_sim(cdm->ccb_h.path));
 		switch(position_type & CAM_DEV_POS_TYPEMASK) {
 		case CAM_DEV_POS_EDT:
 			xptedtmatch(cdm);
@@ -2826,6 +2833,7 @@
 			cdm->status = CAM_DEV_MATCH_ERROR;
 			break;
 		}
+		CAM_SIM_LOCK(xpt_path_sim(cdm->ccb_h.path));
 
 		if (cdm->status == CAM_DEV_MATCH_ERROR)
 			start_ccb->ccb_h.status = CAM_REQ_CMP_ERR;

Modified: trunk/sys/cam/scsi/scsi_enc_ses.c
===================================================================
--- trunk/sys/cam/scsi/scsi_enc_ses.c	2016-09-26 02:34:48 UTC (rev 8749)
+++ trunk/sys/cam/scsi/scsi_enc_ses.c	2016-09-26 02:35:36 UTC (rev 8750)
@@ -901,9 +901,10 @@
 	       device_pattern->data.devid_pat.id_len);
 
 	memset(&cdm, 0, sizeof(cdm));
-	if (xpt_create_path(&cdm.ccb_h.path, /*periph*/NULL, CAM_XPT_PATH_ID,
-			    CAM_TARGET_WILDCARD,
-			    CAM_LUN_WILDCARD) != CAM_REQ_CMP)
+	if (xpt_create_path_unlocked(&cdm.ccb_h.path, /*periph*/NULL,
+				     CAM_XPT_PATH_ID,
+				     CAM_TARGET_WILDCARD,
+				     CAM_LUN_WILDCARD) != CAM_REQ_CMP)
 		return;
 
 	cdm.ccb_h.func_code = XPT_DEV_MATCH;
@@ -913,8 +914,11 @@
 	cdm.match_buf_len   = sizeof(match_result);
 	cdm.matches         = &match_result;
 
+	sim = xpt_path_sim(cdm.ccb_h.path);
+	CAM_SIM_LOCK(sim);
 	xpt_action((union ccb *)&cdm);
 	xpt_free_path(cdm.ccb_h.path);
+	CAM_SIM_UNLOCK(sim);
 
 	if ((cdm.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP
 	 || (cdm.status != CAM_DEV_MATCH_LAST