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Subject[PATCH v7 5/8] mpt3sas: Fix Sync cache command failure during driver unload
Date
This is to fix SYNC CACHE and START STOP command
failures with DID_NO_CONNECT during driver unload.

In driver's IO submission patch (i.e. in driver's .queuecommand())
driver won't allow any SCSI commands to the IOC when ioc->remove_host
flag is set and hence SYNC CACHE commands which are issued to the
target drives (where write cache is enabled) during driver unload time
is failed with DID_NO_CONNECT status.

Now modified the driver to allow SYNC CACHE and START STOP commands
to IOC, even when remove_host flag is set.

Signed-off-by: Suganath Prabu <suganath-prabu.subramani@broadcom.com>
---
drivers/scsi/mpt3sas/mpt3sas_scsih.c | 36 +++++++++++++++++++++++++++++++++++-
1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index 12f565c..df56cbe 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -3748,6 +3748,40 @@ _scsih_tm_tr_complete(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
return _scsih_check_for_pending_tm(ioc, smid);
}

+/** _scsih_allow_scmd_to_device - check whether scmd needs to
+ * issue to IOC or not.
+ * @ioc: per adapter object
+ * @scmd: pointer to scsi command object
+ *
+ * Returns true if scmd can be issued to IOC otherwise returns false.
+ */
+inline bool _scsih_allow_scmd_to_device(struct MPT3SAS_ADAPTER *ioc,
+ struct scsi_cmnd *scmd)
+{
+
+ if (ioc->pci_error_recovery)
+ return false;
+
+ if (ioc->hba_mpi_version_belonged == MPI2_VERSION) {
+ if (ioc->remove_host)
+ return false;
+
+ return true;
+ }
+
+ if (ioc->remove_host) {
+
+ switch (scmd->cmnd[0]) {
+ case SYNCHRONIZE_CACHE:
+ case START_STOP:
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ return true;
+}

/**
* _scsih_sas_control_complete - completion routine
@@ -4571,7 +4605,7 @@ scsih_qcmd(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
return 0;
}

- if (ioc->pci_error_recovery || ioc->remove_host) {
+ if (!(_scsih_allow_scmd_to_device(ioc, scmd))) {
scmd->result = DID_NO_CONNECT << 16;
scmd->scsi_done(scmd);
return 0;
--
1.8.3.1
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