[SCSI] mpt2sas: removed use of tm_cmds.mutex in IOCTL branch.

Removed all the mutex's for ioc->tm_cmds.mutex, then created one
single mutex inside the function mpt2sas_scsih_issue_tm. This is the
single function used when sending task management. Also the sanity
checks required for scsi mid layer escalation were moved to inside the
same function because these checks need to be done while the mutex is
held. The ioc->tm_cmds.mutex inside the IOCTL branch is really not
required since there is another mutex in this code called for ctl_cmds
handling this sync.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

3 files changed, 108 insertions, 83 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h
index cdedfcbb8ca7..9973efd200a5 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -803,8 +803,9 @@ void mpt2sas_halt_firmware(struct MPT2SAS_ADAPTER *ioc);
 /* scsih shared API */
 u8 mpt2sas_scsih_event_callback(struct MPT2SAS_ADAPTER *ioc, u8 msix_index,
     u32 reply);
-void mpt2sas_scsih_issue_tm(struct MPT2SAS_ADAPTER *ioc, u16 handle, uint lun,
-    u8 type, u16 smid_task, ulong timeout);
+int mpt2sas_scsih_issue_tm(struct MPT2SAS_ADAPTER *ioc, u16 handle,
+    uint channel, uint id, uint lun, u8 type, u16 smid_task,
+    ulong timeout, struct scsi_cmnd *scmd);
 void mpt2sas_scsih_set_tm_flag(struct MPT2SAS_ADAPTER *ioc, u16 handle);
 void mpt2sas_scsih_clear_tm_flag(struct MPT2SAS_ADAPTER *ioc, u16 handle);
 struct _sas_node *mpt2sas_scsih_expander_find_by_handle(struct MPT2SAS_ADAPTER *ioc,
diff --git a/drivers/scsi/mpt2sas/mpt2sas_ctl.c b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
index ae55a912baf4..9860e7edd442 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_ctl.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
@@ -753,6 +753,10 @@ _ctl_do_mpt_command(struct MPT2SAS_ADAPTER *ioc,
                 Mpi2SCSITaskManagementRequest_t *tm_request =
                     (Mpi2SCSITaskManagementRequest_t *)mpi_request;
 
+                dtmprintk(ioc, printk(MPT2SAS_DEBUG_FMT "TASK_MGMT: "
+                    "handle(0x%04x), task_type(0x%02x)\n", ioc->name,
+                    le16_to_cpu(tm_request->DevHandle), tm_request->TaskType));
+
                 if (tm_request->TaskType ==
                     MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK ||
                     tm_request->TaskType ==
@@ -763,7 +767,6 @@ _ctl_do_mpt_command(struct MPT2SAS_ADAPTER *ioc,
                         }
                 }
 
-                mutex_lock(&ioc->tm_cmds.mutex);
                 mpt2sas_scsih_set_tm_flag(ioc, le16_to_cpu(
                     tm_request->DevHandle));
                 mpt2sas_base_put_smid_hi_priority(ioc, smid);
@@ -819,7 +822,6 @@ _ctl_do_mpt_command(struct MPT2SAS_ADAPTER *ioc,
         if (mpi_request->Function == MPI2_FUNCTION_SCSI_TASK_MGMT) {
                 Mpi2SCSITaskManagementRequest_t *tm_request =
                     (Mpi2SCSITaskManagementRequest_t *)mpi_request;
-                mutex_unlock(&ioc->tm_cmds.mutex);
                 mpt2sas_scsih_clear_tm_flag(ioc, le16_to_cpu(
                     tm_request->DevHandle));
         } else if ((mpi_request->Function == MPI2_FUNCTION_SMP_PASSTHROUGH ||
@@ -900,12 +902,11 @@ _ctl_do_mpt_command(struct MPT2SAS_ADAPTER *ioc,
                             "= (0x%04x)\n", ioc->name,
                             le16_to_cpu(mpi_request->FunctionDependent1));
                         mpt2sas_halt_firmware(ioc);
-                        mutex_lock(&ioc->tm_cmds.mutex);
                         mpt2sas_scsih_issue_tm(ioc,
-                            le16_to_cpu(mpi_request->FunctionDependent1), 0,
-                            MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET, 0, 10);
+                            le16_to_cpu(mpi_request->FunctionDependent1), 0, 0,
+                            0, MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET, 0, 10,
+                            NULL);
                         ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
-                        mutex_unlock(&ioc->tm_cmds.mutex);
                 } else
                         mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
                             FORCE_BIG_HAMMER);
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index 3d1be440ed7b..cfaefd10515d 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -1944,65 +1944,78 @@ mpt2sas_scsih_clear_tm_flag(struct MPT2SAS_ADAPTER *ioc, u16 handle)
         }
 }
 
+
 /**
  * mpt2sas_scsih_issue_tm - main routine for sending tm requests
  * @ioc: per adapter struct
  * @device_handle: device handle
+ * @channel: the channel assigned by the OS
+ * @id: the id assigned by the OS
  * @lun: lun number
  * @type: MPI2_SCSITASKMGMT_TASKTYPE__XXX (defined in mpi2_init.h)
  * @smid_task: smid assigned to the task
  * @timeout: timeout in seconds
- * Context: The calling function needs to acquire the tm_cmds.mutex
+ * Context: user
  *
  * A generic API for sending task management requests to firmware.
  *
- * The ioc->tm_cmds.status flag should be MPT2_CMD_NOT_USED before calling
- * this API.
- *
  * The callback index is set inside `ioc->tm_cb_idx`.
  *
- * Return nothing.
+ * Return SUCCESS or FAILED.
  */
-void
-mpt2sas_scsih_issue_tm(struct MPT2SAS_ADAPTER *ioc, u16 handle, uint lun,
-    u8 type, u16 smid_task, ulong timeout)
+int
+mpt2sas_scsih_issue_tm(struct MPT2SAS_ADAPTER *ioc, u16 handle, uint channel,
+    uint id, uint lun, u8 type, u16 smid_task, ulong timeout,
+    struct scsi_cmnd *scmd)
 {
         Mpi2SCSITaskManagementRequest_t *mpi_request;
         Mpi2SCSITaskManagementReply_t *mpi_reply;
         u16 smid = 0;
         u32 ioc_state;
         unsigned long timeleft;
+        struct scsi_cmnd *scmd_lookup;
+        int rc;
 
+        mutex_lock(&ioc->tm_cmds.mutex);
         if (ioc->tm_cmds.status != MPT2_CMD_NOT_USED) {
                 printk(MPT2SAS_INFO_FMT "%s: tm_cmd busy!!!\n",
                     __func__, ioc->name);
-                return;
+                rc = FAILED;
+                goto err_out;
         }
 
         if (ioc->shost_recovery || ioc->remove_host) {
                 printk(MPT2SAS_INFO_FMT "%s: host reset in progress!\n",
                     __func__, ioc->name);
-                return;
+                rc = FAILED;
+                goto err_out;
         }
 
         ioc_state = mpt2sas_base_get_iocstate(ioc, 0);
         if (ioc_state & MPI2_DOORBELL_USED) {
                 dhsprintk(ioc, printk(MPT2SAS_DEBUG_FMT "unexpected doorbell "
                     "active!\n", ioc->name));
-                goto issue_host_reset;
+                mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
+                    FORCE_BIG_HAMMER);
+                rc = SUCCESS;
+                goto err_out;
         }
 
         if ((ioc_state & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT) {
                 mpt2sas_base_fault_info(ioc, ioc_state &
                     MPI2_DOORBELL_DATA_MASK);
-                goto issue_host_reset;
+                mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
+                    FORCE_BIG_HAMMER);
+                rc = SUCCESS;
+                goto err_out;
         }
 
         smid = mpt2sas_base_get_smid_hpr(ioc, ioc->tm_cb_idx);
         if (!smid) {
                 printk(MPT2SAS_ERR_FMT "%s: failed obtaining a smid\n",
                     ioc->name, __func__);
-                return;
+                rc = FAILED;
+                goto err_out;
         }
 
         dtmprintk(ioc, printk(MPT2SAS_INFO_FMT "sending tm: handle(0x%04x),"
@@ -2016,21 +2029,24 @@ mpt2sas_scsih_issue_tm(struct MPT2SAS_ADAPTER *ioc, u16 handle, uint lun,
         mpi_request->DevHandle = cpu_to_le16(handle);
         mpi_request->TaskType = type;
         mpi_request->TaskMID = cpu_to_le16(smid_task);
-        mpi_request->VP_ID = 0;  /* TODO */
-        mpi_request->VF_ID = 0;
         int_to_scsilun(lun, (struct scsi_lun *)mpi_request->LUN);
         mpt2sas_scsih_set_tm_flag(ioc, handle);
         init_completion(&ioc->tm_cmds.done);
         mpt2sas_base_put_smid_hi_priority(ioc, smid);
         timeleft = wait_for_completion_timeout(&ioc->tm_cmds.done, timeout*HZ);
-        mpt2sas_scsih_clear_tm_flag(ioc, handle);
         if (!(ioc->tm_cmds.status & MPT2_CMD_COMPLETE)) {
                 printk(MPT2SAS_ERR_FMT "%s: timeout\n",
                     ioc->name, __func__);
                 _debug_dump_mf(mpi_request,
                     sizeof(Mpi2SCSITaskManagementRequest_t)/4);
-                if (!(ioc->tm_cmds.status & MPT2_CMD_RESET))
-                        goto issue_host_reset;
+                if (!(ioc->tm_cmds.status & MPT2_CMD_RESET)) {
+                        mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
+                            FORCE_BIG_HAMMER);
+                        rc = SUCCESS;
+                        ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
+                        mpt2sas_scsih_clear_tm_flag(ioc, handle);
+                        goto err_out;
+                }
         }
 
         if (ioc->tm_cmds.status & MPT2_CMD_REPLY_VALID) {
@@ -2040,12 +2056,57 @@ mpt2sas_scsih_issue_tm(struct MPT2SAS_ADAPTER *ioc, u16 handle, uint lun,
                     ioc->name, le16_to_cpu(mpi_reply->IOCStatus),
                     le32_to_cpu(mpi_reply->IOCLogInfo),
                     le32_to_cpu(mpi_reply->TerminationCount)));
-                if (ioc->logging_level & MPT_DEBUG_TM)
+                if (ioc->logging_level & MPT_DEBUG_TM) {
                         _scsih_response_code(ioc, mpi_reply->ResponseCode);
+                        if (mpi_reply->IOCStatus)
+                                _debug_dump_mf(mpi_request,
+                                    sizeof(Mpi2SCSITaskManagementRequest_t)/4);
+                }
         }
-        return;
- issue_host_reset:
-        mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP, FORCE_BIG_HAMMER);
+
+        /* sanity check:
+         * Check to see the commands were terminated.
+         * This is only needed for eh callbacks, hence the scmd check.
+         */
+        rc = FAILED;
+        if (scmd == NULL)
+                goto bypass_sanity_checks;
+        switch (type) {
+        case MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK:
+                scmd_lookup = _scsih_scsi_lookup_get(ioc, smid_task);
+                if (scmd_lookup && (scmd_lookup->serial_number ==
+                    scmd->serial_number))
+                        rc = FAILED;
+                else
+                        rc = SUCCESS;
+                break;
+
+        case MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET:
+                if (_scsih_scsi_lookup_find_by_target(ioc, id, channel))
+                        rc = FAILED;
+                else
+                        rc = SUCCESS;
+                break;
+
+        case MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET:
+                if (_scsih_scsi_lookup_find_by_lun(ioc, id, lun, channel))
+                        rc = FAILED;
+                else
+                        rc = SUCCESS;
+                break;
+        }
+
+ bypass_sanity_checks:
+
+        mpt2sas_scsih_clear_tm_flag(ioc, handle);
+        ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
+        mutex_unlock(&ioc->tm_cmds.mutex);
+
+        return rc;
+
+ err_out:
+        mutex_unlock(&ioc->tm_cmds.mutex);
+        return rc;
 }
 
 /**
@@ -2062,7 +2123,6 @@ _scsih_abort(struct scsi_cmnd *scmd)
         u16 smid;
         u16 handle;
         int r;
-        struct scsi_cmnd *scmd_lookup;
 
         printk(MPT2SAS_INFO_FMT "attempting task abort! scmd(%p)\n",
             ioc->name, scmd);
@@ -2097,19 +2157,10 @@ _scsih_abort(struct scsi_cmnd *scmd)
 
         mpt2sas_halt_firmware(ioc);
 
-        mutex_lock(&ioc->tm_cmds.mutex);
         handle = sas_device_priv_data->sas_target->handle;
-        mpt2sas_scsih_issue_tm(ioc, handle, sas_device_priv_data->lun,
-            MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK, smid, 30);
-
-        /* sanity check - see whether command actually completed */
-        scmd_lookup = _scsih_scsi_lookup_get(ioc, smid);
-        if (scmd_lookup && (scmd_lookup->serial_number == scmd->serial_number))
-                r = FAILED;
-        else
-                r = SUCCESS;
-        ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
-        mutex_unlock(&ioc->tm_cmds.mutex);
+        r = mpt2sas_scsih_issue_tm(ioc, handle, scmd->device->channel,
+            scmd->device->id, scmd->device->lun,
+            MPI2_SCSITASKMGMT_TASKTYPE_ABORT_TASK, smid, 30, scmd);
 
  out:
         printk(MPT2SAS_INFO_FMT "task abort: %s scmd(%p)\n",
@@ -2166,22 +2217,9 @@ _scsih_dev_reset(struct scsi_cmnd *scmd)
                 goto out;
         }
 
-        mutex_lock(&ioc->tm_cmds.mutex);
-        mpt2sas_scsih_issue_tm(ioc, handle, 0,
-            MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET, scmd->device->lun,
-            30);
-
-        /*
-         *  sanity check see whether all commands to this device been
-         *  completed
-         */
-        if (_scsih_scsi_lookup_find_by_lun(ioc, scmd->device->id,
-            scmd->device->lun, scmd->device->channel))
-                r = FAILED;
-        else
-                r = SUCCESS;
-        ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
-        mutex_unlock(&ioc->tm_cmds.mutex);
+        r = mpt2sas_scsih_issue_tm(ioc, handle, scmd->device->channel,
+            scmd->device->id, scmd->device->lun,
+            MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET, 0, 30, scmd);
 
  out:
         printk(MPT2SAS_INFO_FMT "device reset: %s scmd(%p)\n",
@@ -2238,21 +2276,9 @@ _scsih_target_reset(struct scsi_cmnd *scmd)
                 goto out;
         }
 
-        mutex_lock(&ioc->tm_cmds.mutex);
-        mpt2sas_scsih_issue_tm(ioc, handle, 0,
-            MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET, 0, 30);
-
-        /*
-         *  sanity check see whether all commands to this target been
-         *  completed
-         */
-        if (_scsih_scsi_lookup_find_by_target(ioc, scmd->device->id,
-            scmd->device->channel))
-                r = FAILED;
-        else
-                r = SUCCESS;
-        ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
-        mutex_unlock(&ioc->tm_cmds.mutex);
+        r = mpt2sas_scsih_issue_tm(ioc, handle, scmd->device->channel,
+            scmd->device->id, 0, MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET, 0,
+            30, scmd);
 
  out:
         printk(MPT2SAS_INFO_FMT "target reset: %s scmd(%p)\n",
@@ -4183,8 +4209,8 @@ _scsih_remove_pd_device(struct MPT2SAS_ADAPTER *ioc, struct _sas_device
                 return;
         dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "issue target reset: "
             "handle(0x%04x)\n", ioc->name, vol_handle));
-        mpt2sas_scsih_issue_tm(ioc, vol_handle, 0,
-            MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET, 0, 30);
+        mpt2sas_scsih_issue_tm(ioc, vol_handle, 0, 0, 0,
+            MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET, 0, 30, NULL);
         dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "issue target reset "
             "done: handle(0x%04x)\n", ioc->name, vol_handle));
         if (ioc->shost_recovery)
@@ -4668,7 +4694,6 @@ _scsih_sas_broadcast_primative_event(struct MPT2SAS_ADAPTER *ioc,
         dtmprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: enter\n", ioc->name,
             __func__));
 
-        mutex_lock(&ioc->tm_cmds.mutex);
         termination_count = 0;
         query_count = 0;
         mpi_reply = ioc->tm_cmds.reply;
@@ -4692,8 +4717,8 @@ _scsih_sas_broadcast_primative_event(struct MPT2SAS_ADAPTER *ioc,
                 lun = sas_device_priv_data->lun;
                 query_count++;
 
-                mpt2sas_scsih_issue_tm(ioc, handle, lun,
-                    MPI2_SCSITASKMGMT_TASKTYPE_QUERY_TASK, smid, 30);
+                mpt2sas_scsih_issue_tm(ioc, handle, 0, 0, lun,
+                    MPI2_SCSITASKMGMT_TASKTYPE_QUERY_TASK, smid, 30, NULL);
                 ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
                 ioc_status = le16_to_cpu(mpi_reply->IOCStatus)
                     & MPI2_IOCSTATUS_MASK;
@@ -4704,13 +4729,11 @@ _scsih_sas_broadcast_primative_event(struct MPT2SAS_ADAPTER *ioc,
                      MPI2_SCSITASKMGMT_RSP_IO_QUEUED_ON_IOC))
                         continue;
 
-                mpt2sas_scsih_issue_tm(ioc, handle, lun,
-                    MPI2_SCSITASKMGMT_TASKTYPE_ABRT_TASK_SET, 0, 30);
-                ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
+                mpt2sas_scsih_issue_tm(ioc, handle, 0, 0, lun,
+                    MPI2_SCSITASKMGMT_TASKTYPE_ABRT_TASK_SET, 0, 30, NULL);
                 termination_count += le32_to_cpu(mpi_reply->TerminationCount);
         }
         ioc->broadcast_aen_busy = 0;
-        mutex_unlock(&ioc->tm_cmds.mutex);
 
         dtmprintk(ioc, printk(MPT2SAS_DEBUG_FMT
             "%s - exit, query_count = %d termination_count = %d\n",