[SCSI] mpt2sas: WarpDrive Infinite command retries due to wrong scsi command entry in MPI message

Issue:

This issue is seen on LSI H/W WarpDrive SSS6200 When filed direct I/O
is tried as volume I/O the scmd field in internal lookup table get
cleared and because of that the retried volume I/O never gets reported
as completed to SML.

Result:

I/O timeout and Error handling thread will kicking off

Fix:

Setting back the scmd in the lookup table before retrying the failed
direct i/o

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index 939f283d0c28..6abd2fcc43e2 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -4258,6 +4258,7 @@ _scsih_io_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
         u32 log_info;
         struct MPT2SAS_DEVICE *sas_device_priv_data;
         u32 response_code = 0;
+        unsigned long flags;
 
         mpi_reply = mpt2sas_base_get_reply_virt_addr(ioc, reply);
         scmd = _scsih_scsi_lookup_get_clear(ioc, smid);
@@ -4282,6 +4283,9 @@ _scsih_io_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
          * the failed direct I/O should be redirected to volume
          */
         if (_scsih_scsi_direct_io_get(ioc, smid)) {
+                spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
+                ioc->scsi_lookup[smid - 1].scmd = scmd;
+                spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
                 _scsih_scsi_direct_io_set(ioc, smid, 0);
                 memcpy(mpi_request->CDB.CDB32, scmd->cmnd, scmd->cmd_len);
                 mpi_request->DevHandle =