scsi: libsas: Fix error path in sas_notify_lldd_dev_found()

In sas_notify_lldd_dev_found(), if we can't allocate the necessary
resources, then it seems like the wrong thing to mark the device as found
and to increment the reference count.  None of the callers ever drop the
reference in that situation.

[mkp: tweaked commit desc based on feedback from John]

Link: https://lore.kernel.org/r/20200905125836.GF183976@mwanda
Fixes: 735f7d2fedf5 ("[SCSI] libsas: fix domain_device leak")
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Acked-by: John Garry <john.garry@huawei.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
index daf951b0b3f5538fa05f7c7b5e2e99626e18d5cd..13ad2b3d314e27bdd4621d05124ac44da55febd2 100644 (file)
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -182,10 +182,11 @@ int sas_notify_lldd_dev_found(struct domain_device *dev)
                pr_warn("driver on host %s cannot handle device %016llx, error:%d\n",
                        dev_name(sas_ha->dev),
                        SAS_ADDR(dev->sas_addr), res);
+               return res;
        }
        set_bit(SAS_DEV_FOUND, &dev->state);
        kref_get(&dev->kref);
-       return res;
+       return 0;
 }