[PATCH 15/17] mpt2sas: Copy sense buffer instead of working on direct memory location

["Kashyap, Desai" <kashyap.desai@lsi.com>]

(1) driver was not setting the sense data size prior to sending SCSI_IO,
resulting in the 0x31190000 loginfo
(2) The driver needs to copy the sense data to local buffer prior
to releasing the request message frame.  If not, the sense buffer gets
overwritten by the next SCSI_IO request.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
---
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index d848744..1f22a76 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -3668,12 +3668,14 @@ mpt2sas_base_attach(struct MPT2SAS_ADAPTER *ioc)
 
 	/* ctl module internal command bits */
 	ioc->ctl_cmds.reply = kzalloc(ioc->reply_sz, GFP_KERNEL);
+	ioc->ctl_cmds.sense = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
 	ioc->ctl_cmds.status = MPT2_CMD_NOT_USED;
 	mutex_init(&ioc->ctl_cmds.mutex);
 
 	if (!ioc->base_cmds.reply || !ioc->transport_cmds.reply ||
 	    !ioc->scsih_cmds.reply || !ioc->tm_cmds.reply ||
-	    !ioc->config_cmds.reply || !ioc->ctl_cmds.reply) {
+	    !ioc->config_cmds.reply || !ioc->ctl_cmds.reply ||
+	    !ioc->ctl_cmds.sense) {
 		r = -ENOMEM;
 		goto out_free_resources;
 	}
@@ -3722,6 +3724,7 @@ mpt2sas_base_attach(struct MPT2SAS_ADAPTER *ioc)
 	kfree(ioc->config_cmds.reply);
 	kfree(ioc->base_cmds.reply);
 	kfree(ioc->ctl_cmds.reply);
+	kfree(ioc->ctl_cmds.sense);
 	kfree(ioc->pfacts);
 	ioc->ctl_cmds.reply = NULL;
 	ioc->base_cmds.reply = NULL;
@@ -3754,6 +3757,7 @@ mpt2sas_base_detach(struct MPT2SAS_ADAPTER *ioc)
 	kfree(ioc->pd_handles);
 	kfree(ioc->pfacts);
 	kfree(ioc->ctl_cmds.reply);
+	kfree(ioc->ctl_cmds.sense);
 	kfree(ioc->base_cmds.reply);
 	kfree(ioc->tm_cmds.reply);
 	kfree(ioc->transport_cmds.reply);
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h
index 9599558..749fd3b 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -247,6 +247,7 @@ struct MPT2SAS_DEVICE {
  * @mutex: mutex
  * @done: completion
  * @reply: reply message pointer
+ * @sense: sense data
  * @status: MPT2_CMD_XXX status
  * @smid: system message id
  */
@@ -254,6 +255,7 @@ struct _internal_cmd {
 	struct mutex mutex;
 	struct completion done;
 	void 	*reply;
+	void	*sense;
 	u16	status;
 	u16	smid;
 };
diff --git a/drivers/scsi/mpt2sas/mpt2sas_ctl.c b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
index 03a9c5d..45d20a2 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_ctl.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
@@ -275,6 +275,9 @@ mpt2sas_ctl_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
 	u32 reply)
 {
 	MPI2DefaultReply_t *mpi_reply;
+	Mpi2SCSIIOReply_t *scsiio_reply;
+	const void *sense_data;
+	u32 sz;
 
 	if (ioc->ctl_cmds.status == MPT2_CMD_NOT_USED)
 		return 1;
@@ -285,6 +288,20 @@ mpt2sas_ctl_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
 	if (mpi_reply) {
 		memcpy(ioc->ctl_cmds.reply, mpi_reply, mpi_reply->MsgLength*4);
 		ioc->ctl_cmds.status |= MPT2_CMD_REPLY_VALID;
+		/* get sense data */
+		if (mpi_reply->Function == MPI2_FUNCTION_SCSI_IO_REQUEST ||
+		    mpi_reply->Function ==
+		    MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH) {
+			scsiio_reply = (Mpi2SCSIIOReply_t *)mpi_reply;
+			if (scsiio_reply->SCSIState &
+			    MPI2_SCSI_STATE_AUTOSENSE_VALID) {
+				sz = min_t(u32, SCSI_SENSE_BUFFERSIZE,
+				    le32_to_cpu(scsiio_reply->SenseCount));
+				sense_data = mpt2sas_base_get_sense_buffer(ioc,
+				    smid);
+				memcpy(ioc->ctl_cmds.sense, sense_data, sz);
+			}
+		}
 	}
 #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
 	_ctl_display_some_debug(ioc, smid, "ctl_done", mpi_reply);
@@ -618,7 +635,6 @@ _ctl_do_mpt_command(struct MPT2SAS_ADAPTER *ioc,
 	u8 issue_reset;
 	u32 sz;
 	void *psge;
-	void *priv_sense = NULL;
 	void *data_out = NULL;
 	dma_addr_t data_out_dma;
 	size_t data_out_sz = 0;
@@ -782,10 +798,10 @@ _ctl_do_mpt_command(struct MPT2SAS_ADAPTER *ioc,
 	{
 		Mpi2SCSIIORequest_t *scsiio_request =
 		    (Mpi2SCSIIORequest_t *)mpi_request;
+		scsiio_request->SenseBufferLength = SCSI_SENSE_BUFFERSIZE;
 		scsiio_request->SenseBufferLowAddress =
 		    mpt2sas_base_get_sense_buffer_dma(ioc, smid);
-		priv_sense = mpt2sas_base_get_sense_buffer(ioc, smid);
-		memset(priv_sense, 0, SCSI_SENSE_BUFFERSIZE);
+		memset(ioc->ctl_cmds.sense, 0, SCSI_SENSE_BUFFERSIZE);
 		if (mpi_request->Function == MPI2_FUNCTION_SCSI_IO_REQUEST)
 			mpt2sas_base_put_smid_scsi_io(ioc, smid,
 			    le16_to_cpu(mpi_request->FunctionDependent1));
@@ -929,7 +945,8 @@ _ctl_do_mpt_command(struct MPT2SAS_ADAPTER *ioc,
 	    MPI2_FUNCTION_SCSI_IO_REQUEST || mpi_request->Function ==
 	    MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH)) {
 		sz = min_t(u32, karg.max_sense_bytes, SCSI_SENSE_BUFFERSIZE);
-		if (copy_to_user(karg.sense_data_ptr, priv_sense, sz)) {
+		if (copy_to_user(karg.sense_data_ptr,
+			ioc->ctl_cmds.sense, sz)) {
 			printk(KERN_ERR "failure at %s:%d/%s()!\n", __FILE__,
 			    __LINE__, __func__);
 			ret = -ENODATA;