From: Suganath Prabu suganath-prabu.subramani@broadcom.com
[ Upstream commit 9029a72500b95578a35877a43473b82cb0386c53 ]
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 Reviewed-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 7d67a68bcc624..8735e4257028a 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c +++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c @@ -3254,6 +3254,40 @@ _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 @@ -3880,7 +3914,7 @@ 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;