commit 3a9c5560f677690f65038f399f4f598c79b83186
author Dan Williams <dan.j.williams@intel.com> Wed Dec 21 15:19:56 2011 -0800
committer James Bottomley <JBottomley@Parallels.com> Wed Feb 29 12:55:12 2012 -0600
tree 1e15d427fd86260fc26670bc4ceff61d51ef025e
parent 0508c2f3b701f3cd8ed52b2a4abbb2a670f69ce2

[SCSI] libsas: check for 'gone' expanders in smp_execute_task()

No sense in issuing or retrying commands to an expander that has been
removed.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/libsas/sas_expander.c

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 7701ab5..6fb1f3a 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -74,6 +74,11 @@
 
 	mutex_lock(&dev->ex_dev.cmd_mutex);
 	for (retry = 0; retry < 3; retry++) {
+		if (test_bit(SAS_DEV_GONE, &dev->state)) {
+			res = -ECOMM;
+			break;
+		}
+
 		task = sas_alloc_task(GFP_KERNEL);
 		if (!task) {
 			res = -ENOMEM;