Move xen patchset to new version's subdir.

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.arch / s390-04-09-zfcp-host-busy-count-fix.patch

From: Gerald Schaefer <geraldsc@de.ibm.com>
Subject: zfcp: prevent double decrement on host_busy counter
References: bnc#445100

Symptom:     SCSI host hangs
Problem:     double finish triggerd for one request
Solution:    respond, act according to SCSI_mid_low API

The zfcp_scsi_queuecommand was not acting according to the standard
when respective unit was not available. In this case an -EBUSY was
returned, which is not valid in itself, and in addition scsi_done 
was called. This combination is not allowed and was leading to a
double finish of the request and therefor double decrement of the
host_busy counter.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Acked-by: John Jolly <jjolly@suse.de>
---
 drivers/s390/scsi/zfcp_scsi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-sles11/drivers/s390/scsi/zfcp_scsi.c
===================================================================
--- linux-sles11.orig/drivers/s390/scsi/zfcp_scsi.c
+++ linux-sles11/drivers/s390/scsi/zfcp_scsi.c
@@ -90,7 +90,7 @@ static int zfcp_scsi_queuecommand(struct
 	ret = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, 0,
 					     ZFCP_REQ_AUTO_CLEANUP);
 	if (unlikely(ret == -EBUSY))
-		zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
+		return SCSI_MLQUEUE_DEVICE_BUSY;
 	else if (unlikely(ret < 0))
 		return SCSI_MLQUEUE_HOST_BUSY;