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Commit 9f21316f authored by Joe Lawrence's avatar Joe Lawrence Committed by Christoph Hellwig
Browse files

mptfusion: tweak null pointer checks 



Fixes the following smatch warnings:

  drivers/message/fusion/mptbase.c:652 mptbase_reply() warn: variable
    dereferenced before check 'reply' (see line 639)

      [JL: No-brainer, the enclosing switch statement dereferences
       reply, so we can't get here unless reply is valid.]

  drivers/message/fusion/mptsas.c:1255 mptsas_taskmgmt_complete() error:
    we previously assumed 'pScsiTmReply' could be null (see line 1227)

      [HCH: Reading the code in mptsas_taskmgmt_complete it's pretty
       obvious that it can't do anything useful if mr/pScsiTmReply are
       NULL, so I suspect it would be best to just return at the
       beginning of the function.

       I'd love to understand if it actually could ever be zero, which I
       doubt.  Maybe the LSI people can shed some light on that?]

  drivers/message/fusion/mptsas.c:3888 mptsas_not_responding_devices()
    error: we previously assumed 'port_info->phy_info' could be null
    (see line 3875)

      [HCH: It's pretty obvious from reading mptsas_sas_io_unit_pg0 that
       we never register a port_info with a NULL phy_info in the lists,
       so all NULL checks on it could be deleted.]

  drivers/message/fusion/mptscsih.c:1284 mptscsih_info() error:
    we previously assumed 'h' could be null (see line 1274)

      [HCH: shost_priv can't return NULL, so the if (h) should be
       removed.]

  drivers/message/fusion/mptscsih.c:1388 mptscsih_qcmd() error: we
    previously assumed 'vdevice' could be null (see line 1373)

      [HCH: vdevice can't ever be NULL here, it's allocated in
       ->slave_alloc and thus guaranteed to be around when
       ->queuecommand is called.]

Signed-off-by: default avatarJoe Lawrence <joe.lawrence@stratus.com>
Acked-by: default avatarSreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 32696198

drivers/message/fusion/mptbase.c

+4 −6
Original line number Diff line number Diff line
@@ -649,12 +649,10 @@ mptbase_reply(MPT_ADAPTER *ioc, MPT_FRAME_HDR *req, MPT_FRAME_HDR *reply) 
	case MPI_FUNCTION_CONFIG:

	case MPI_FUNCTION_SAS_IO_UNIT_CONTROL:

		ioc->mptbase_cmds.status |= MPT_MGMT_STATUS_COMMAND_GOOD;

		if (reply) {

		ioc->mptbase_cmds.status |= MPT_MGMT_STATUS_RF_VALID;

		memcpy(ioc->mptbase_cmds.reply, reply,

		    min(MPT_DEFAULT_FRAME_SIZE,

			4 * reply->u.reply.MsgLength));

		}

		if (ioc->mptbase_cmds.status & MPT_MGMT_STATUS_PENDING) {

			ioc->mptbase_cmds.status &= ~MPT_MGMT_STATUS_PENDING;

			complete(&ioc->mptbase_cmds.done);

drivers/message/fusion/mptsas.c

+25 −27
Original line number Diff line number Diff line
@@ -1203,7 +1203,9 @@ mptsas_taskmgmt_complete(MPT_ADAPTER *ioc, MPT_FRAME_HDR *mf, MPT_FRAME_HDR *mr) 
	    "(mf = %p, mr = %p)\n", ioc->name, mf, mr));



	pScsiTmReply = (SCSITaskMgmtReply_t *)mr;

	if (pScsiTmReply) {

	if (!pScsiTmReply)

		return 0;



	dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT

	    "\tTaskMgmt completed: fw_channel = %d, fw_id = %d,\n"

	    "\ttask_type = 0x%02X, iocstatus = 0x%04X "
@@ -1219,11 +1221,10 @@ mptsas_taskmgmt_complete(MPT_ADAPTER *ioc, MPT_FRAME_HDR *mf, MPT_FRAME_HDR *mr) 
	if (pScsiTmReply->ResponseCode)

		mptscsih_taskmgmt_response_code(ioc,

		pScsiTmReply->ResponseCode);

	}



	if (pScsiTmReply && (pScsiTmReply->TaskType ==

	if (pScsiTmReply->TaskType ==

	    MPI_SCSITASKMGMT_TASKTYPE_QUERY_TASK || pScsiTmReply->TaskType ==

	     MPI_SCSITASKMGMT_TASKTYPE_ABRT_TASK_SET)) {

	     MPI_SCSITASKMGMT_TASKTYPE_ABRT_TASK_SET) {

		ioc->taskmgmt_cmds.status |= MPT_MGMT_STATUS_COMMAND_GOOD;

		ioc->taskmgmt_cmds.status |= MPT_MGMT_STATUS_RF_VALID;

		memcpy(ioc->taskmgmt_cmds.reply, mr,
@@ -3853,10 +3854,8 @@ mptsas_not_responding_devices(MPT_ADAPTER *ioc) 
			phy_info = mptsas_find_phyinfo_by_sas_address(ioc,

					sas_info->sas_address);



			if (phy_info) {

			mptsas_del_end_device(ioc, phy_info);

			goto redo_device_scan;

			}

		} else

			mptsas_volume_delete(ioc, sas_info->fw.id);

	}
@@ -3867,9 +3866,8 @@ mptsas_not_responding_devices(MPT_ADAPTER *ioc) 
 redo_expander_scan:

	list_for_each_entry(port_info, &ioc->sas_topology, list) {



		if (port_info->phy_info &&

		    (!(port_info->phy_info[0].identify.device_info &

		    MPI_SAS_DEVICE_INFO_SMP_TARGET)))

		if (!(port_info->phy_info[0].identify.device_info &

		    MPI_SAS_DEVICE_INFO_SMP_TARGET))

			continue;

		found_expander = 0;

		handle = 0xFFFF;

drivers/message/fusion/mptscsih.c

+8 −11
Original line number Diff line number Diff line
@@ -1271,7 +1271,6 @@ mptscsih_info(struct Scsi_Host *SChost) 


	h = shost_priv(SChost);



	if (h) {

	if (h->info_kbuf == NULL)

		if ((h->info_kbuf = kmalloc(0x1000 /* 4Kb */, GFP_KERNEL)) == NULL)

			return h->info_kbuf;
@@ -1279,7 +1278,6 @@ mptscsih_info(struct Scsi_Host *SChost) 


	mpt_print_ioc_summary(h->ioc, h->info_kbuf, &size, 0, 0);

	h->info_kbuf[size-1] = '\0';

	}



	return h->info_kbuf;

}
@@ -1368,8 +1366,7 @@ mptscsih_qcmd(struct scsi_cmnd *SCpnt) 
	/* Default to untagged. Once a target structure has been allocated,

	 * use the Inquiry data to determine if device supports tagged.

	 */

	if (vdevice

	    && (vdevice->vtarget->tflags & MPT_TARGET_FLAGS_Q_YES)

	if ((vdevice->vtarget->tflags & MPT_TARGET_FLAGS_Q_YES)

	    && (SCpnt->device->tagged_supported)) {

		scsictl = scsidir | MPI_SCSIIO_CONTROL_SIMPLEQ;

		if (SCpnt->request && SCpnt->request->ioprio) {