mpt2sas: fix internal device reset for older firmware prior to MPI Rev K

commit efe82a16bc0f9f9e1fc8fa706eb0309fcd57770a upstream.

The "internal device reset complete" event is not supported
for older firmware prior to MPI Rev K We added
a check in the driver so the "internal device reset" event is
ignored for older firmware.  When ignored, the tm_busy flag doesn't
get set nor cleared.  Without this fix, IO queues would be froozen
indefinetly after the "internal device reset" event, as the "complete" event
never sent to clear the flag.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index 40585f0..672a9fd 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -4939,6 +4939,12 @@ _scsih_sas_device_status_change_event(struct MPT2SAS_ADAPTER *ioc,
                     event_data);
 #endif
 
+       /* In MPI Revision K (0xC), the internal device reset complete was
+        * implemented, so avoid setting tm_busy flag for older firmware.
+        */
+       if ((ioc->facts.HeaderVersion >> 8) < 0xC)
+               return;
+
        if (event_data->ReasonCode !=
            MPI2_EVENT_SAS_DEV_STAT_RC_INTERNAL_DEVICE_RESET &&
           event_data->ReasonCode !=