scsi: hisi_sas: fix SAS_QUEUE_FULL problem while running IO

This patch fix SAS_QUEUE_FULL problem. The test situation is close port while
running IO.

In sas_eh_handle_sas_errors(), SCSI EH will free sas_task of the device if
lldd_I_T_nexus_reset() return TMF_RESP_FUNC_COMPLETE or -ENODEV.  But in our
SAS driver, we only free slots of the device when the return value is
TMF_RESP_FUNC_COMPLETE. So if the return value is -ENODEV, the slot resource
will not free any more.

As an solution, we should also free slots of the device in
lldd_I_T_nexus_reset() if the return value is -ENODEV.

Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 302da84..9bd98e5 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -1308,7 +1308,7 @@ static int hisi_sas_I_T_nexus_reset(struct domain_device *device)
 
        rc = hisi_sas_debug_I_T_nexus_reset(device);
 
-       if (rc == TMF_RESP_FUNC_COMPLETE) {
+       if ((rc == TMF_RESP_FUNC_COMPLETE) || (rc == -ENODEV)) {
                spin_lock_irqsave(&hisi_hba->lock, flags);
                hisi_sas_release_task(hisi_hba, device);
                spin_unlock_irqrestore(&hisi_hba->lock, flags);