scsi: mpi3mr: Allow certain commands during pci-remove hook

Instead of driver returning DID_NO_CONNECT during driver unload allow SSU
and Sync Cache commands to be sent to the controller to flush any cached
data from the drive.

Link: https://lore.kernel.org/r/20210520152545.2710479-16-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/mpi3mr/mpi3mr_os.c b/drivers/scsi/mpi3mr/mpi3mr_os.c
index 0a0e42d..221a850 100644 (file)
--- a/drivers/scsi/mpi3mr/mpi3mr_os.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_os.c
@@ -2768,6 +2768,26 @@ static int mpi3mr_target_alloc(struct scsi_target *starget)
 }
 
 /**
+ * mpi3mr_allow_scmd_to_fw - Command is allowed during shutdown
+ * @scmd: SCSI Command reference
+ *
+ * Checks whether a cdb is allowed during shutdown or not.
+ *
+ * Return: TRUE for allowed commands, FALSE otherwise.
+ */
+
+inline bool mpi3mr_allow_scmd_to_fw(struct scsi_cmnd *scmd)
+{
+       switch (scmd->cmnd[0]) {
+       case SYNCHRONIZE_CACHE:
+       case START_STOP:
+               return true;
+       default:
+               return false;
+       }
+}
+
+/**
  * mpi3mr_qcmd - I/O request despatcher
  * @shost: SCSI Host reference
  * @scmd: SCSI Command reference
@@ -2802,7 +2822,8 @@ static int mpi3mr_qcmd(struct Scsi_Host *shost,
                goto out;
        }
 
-       if (mrioc->stop_drv_processing) {
+       if (mrioc->stop_drv_processing &&
+           !(mpi3mr_allow_scmd_to_fw(scmd))) {
                scmd->result = DID_NO_CONNECT << 16;
                scmd->scsi_done(scmd);
                goto out;