[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>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 7701ab588404..6fb1f3afd1e0 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -74,6 +74,11 @@ static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
 
         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;