sbp2: fix another deadlock after disconnection
authorStefan Richter <stefanr@s5r6.in-berlin.de>
Tue, 31 Jan 2006 05:13:06 +0000 (00:13 -0500)
committerJody McIntyre <scjody@modernduck.com>
Thu, 23 Feb 2006 05:25:08 +0000 (00:25 -0500)
If there were commands enqueued but not completed before an SBP-2 unit
was unplugged (or an attempt to reconnect failed), knodemgrd or any
process which tried to remove the device would sleep uninterruptibly
in blk_execute_rq().  Therefore make sure that all commands are
completed when sbp2 retreats.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jody McIntyre <scjody@modernduck.com>
(cherry picked from 61daa34c132c5d4ed8630e2c46e9bf2f0c7b3428 commit)

drivers/ieee1394/sbp2.c

index c2c776f..8963dd4 100644 (file)
@@ -643,9 +643,15 @@ static int sbp2_remove(struct device *dev)
        if (!scsi_id)
                return 0;
 
-       /* Trigger shutdown functions in scsi's highlevel. */
-       if (scsi_id->scsi_host)
+       if (scsi_id->scsi_host) {
+               /* Get rid of enqueued commands if there is no chance to
+                * send them. */
+               if (!sbp2util_node_is_available(scsi_id))
+                       sbp2scsi_complete_all_commands(scsi_id, DID_NO_CONNECT);
+               /* scsi_remove_device() will trigger shutdown functions of SCSI
+                * highlevel drivers which would deadlock if blocked. */
                scsi_unblock_requests(scsi_id->scsi_host);
+       }
        sdev = scsi_id->sdev;
        if (sdev) {
                scsi_id->sdev = NULL;