svn commit: r252201 - in stable/9/sys/cam: ata scsi

[Alexander Motin]

Author: mav
Date: Tue Jun 25 07:27:23 2013
New Revision: 252201
URL: http://svnweb.freebsd.org/changeset/base/252201

Log:
  MFC r251792:
  Restore use of polling mode for disk cache flush in case of kernel panic.
  While I am not sure that any extra hardware access is a good idea after
  panic, that is an existing behaviour that should better work correctly.

Modified:
  stable/9/sys/cam/ata/ata_da.c
  stable/9/sys/cam/scsi/scsi_da.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/cam/ata/ata_da.c
==============================================================================
--- stable/9/sys/cam/ata/ata_da.c	Tue Jun 25 07:17:30 2013	(r252200)
+++ stable/9/sys/cam/ata/ata_da.c	Tue Jun 25 07:27:23 2013	(r252201)
@@ -45,6 +45,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/eventhandler.h>
 #include <sys/malloc.h>
 #include <sys/cons.h>
+#include <sys/proc.h>
 #include <sys/reboot.h>
 #include <geom/geom_disk.h>
 #endif /* _KERNEL */
@@ -1932,11 +1933,16 @@ adaflush(void)
 	int error;
 
 	CAM_PERIPH_FOREACH(periph, &adadriver) {
-		/* If we paniced with lock held - not recurse here. */
-		if (cam_periph_owned(periph))
+		softc = (struct ada_softc *)periph->softc;
+		if (SCHEDULER_STOPPED()) {
+			/* If we paniced with the lock held, do not recurse. */
+			if (!cam_periph_owned(periph) &&
+			    (softc->flags & ADA_FLAG_OPEN)) {
+				adadump(softc->disk, NULL, 0, 0, 0);
+			}
 			continue;
+		}
 		cam_periph_lock(periph);
-		softc = (struct ada_softc *)periph->softc;
 		/*
 		 * We only sync the cache if the drive is still open, and
 		 * if the drive is capable of it..

Modified: stable/9/sys/cam/scsi/scsi_da.c
==============================================================================
--- stable/9/sys/cam/scsi/scsi_da.c	Tue Jun 25 07:17:30 2013	(r252200)
+++ stable/9/sys/cam/scsi/scsi_da.c	Tue Jun 25 07:27:23 2013	(r252201)
@@ -45,6 +45,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/malloc.h>
 #include <sys/cons.h>
 #include <sys/endian.h>
+#include <sys/proc.h>
 #include <geom/geom.h>
 #include <geom/geom_disk.h>
 #endif /* _KERNEL */
@@ -3617,8 +3618,16 @@ dashutdown(void * arg, int howto)
 	int error;
 
 	CAM_PERIPH_FOREACH(periph, &dadriver) {
-		cam_periph_lock(periph);
 		softc = (struct da_softc *)periph->softc;
+		if (SCHEDULER_STOPPED()) {
+			/* If we paniced with the lock held, do not recurse. */
+			if (!cam_periph_owned(periph) &&
+			    (softc->flags & DA_FLAG_OPEN)) {
+				dadump(softc->disk, NULL, 0, 0, 0);
+			}
+			continue;
+		}
+		cam_periph_lock(periph);
 
 		/*
 		 * We only sync the cache if the drive is still open, and