[SCSI] pm8001: Fixes for tag alloc, error goto and code cleanup

Allocate right size for bitmap tag,fix error goto and cleanup print
message and undocable commemts. patch attached.

Signed-off-by: Lindar Liu <lindar_liu@usish.com>
Signed-off-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 36 insertions, 35 deletions

diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
index 811b5d36d5f0..42ebe725d5a5 100644
--- a/drivers/scsi/pm8001/pm8001_init.c
+++ b/drivers/scsi/pm8001/pm8001_init.c
@@ -203,9 +203,9 @@ static int __devinit pm8001_alloc(struct pm8001_hba_info *pm8001_ha)
         for (i = 0; i < pm8001_ha->chip->n_phy; i++)
                 pm8001_phy_init(pm8001_ha, i);
 
-        pm8001_ha->tags = kmalloc(sizeof(*pm8001_ha->tags)*PM8001_MAX_DEVICES,
-                GFP_KERNEL);
-
+        pm8001_ha->tags = kzalloc(PM8001_MAX_CCB, GFP_KERNEL);
+        if (!pm8001_ha->tags)
+                goto err_out;
         /* MPI Memory region 1 for AAP Event Log for fw */
         pm8001_ha->memoryMap.region[AAP1].num_elements = 1;
         pm8001_ha->memoryMap.region[AAP1].element_size = PM8001_EVENT_LOG_SIZE;
@@ -287,6 +287,9 @@ static int __devinit pm8001_alloc(struct pm8001_hba_info *pm8001_ha)
                 pm8001_ha->ccb_info[i].ccb_dma_handle =
                         pm8001_ha->memoryMap.region[CCB_MEM].phys_addr +
                         i * sizeof(struct pm8001_ccb_info);
+                pm8001_ha->ccb_info[i].task = NULL;
+                pm8001_ha->ccb_info[i].ccb_tag = 0xffffffff;
+                pm8001_ha->ccb_info[i].device = NULL;
                 ++pm8001_ha->tags_num;
         }
         pm8001_ha->flags = PM8001F_INIT_TIME;
@@ -578,7 +581,7 @@ static u32 pm8001_request_irq(struct pm8001_hba_info *pm8001_ha)
 {
         struct pci_dev *pdev;
         irq_handler_t irq_handler = pm8001_interrupt;
-        u32 rc;
+        int rc;
 
         pdev = pm8001_ha->pdev;
 
diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index 1e840fd15160..1f767a0e727a 100644
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -330,15 +330,12 @@ int pm8001_slave_configure(struct scsi_device *sdev)
         return 0;
 }
 /**
-  * pm8001_task_exec -execute the task which come from upper level, send the
-  * command or data to DMA area and then increase CI,for queuecommand(ssp),
-  * it is from upper layer and for smp command,it is from libsas,
-  * for ata command it is from libata.
+  * pm8001_task_exec - queue the task(ssp, smp && ata) to the hardware.
   * @task: the task to be execute.
   * @num: if can_queue great than 1, the task can be queued up. for SMP task,
   * we always execute one one time.
   * @gfp_flags: gfp_flags.
-  * @is tmf: if it is task management task.
+  * @is_tmf: if it is task management task.
   * @tmf: the task management IU
   */
 #define DEV_IS_GONE(pm8001_dev) \
@@ -379,7 +376,7 @@ static int pm8001_task_exec(struct sas_task *task, const int num,
                                         pm8001_printk("device %016llx not "
                                         "ready.\n", SAS_ADDR(dev->sas_addr)));
                         }
-                rc = SAS_PHY_DOWN;
+                        rc = SAS_PHY_DOWN;
                         goto out_done;
                 }
                 rc = pm8001_tag_alloc(pm8001_ha, &tag);
@@ -395,14 +392,14 @@ static int pm8001_task_exec(struct sas_task *task, const int num,
                                         t->data_dir);
                                 if (!n_elem) {
                                         rc = -ENOMEM;
-                                        goto err_out;
+                                        goto err_out_tag;
                                 }
                         }
                 } else {
                         n_elem = t->num_scatter;
                 }
 
-                t->lldd_task = NULL;
+                t->lldd_task = ccb;
                 ccb->n_elem = n_elem;
                 ccb->ccb_tag = tag;
                 ccb->task = t;
@@ -435,7 +432,6 @@ static int pm8001_task_exec(struct sas_task *task, const int num,
                                 pm8001_printk("rc is %x\n", rc));
                         goto err_out_tag;
                 }
-                t->lldd_task = ccb;
                 /* TODO: select normal or high priority */
                 spin_lock(&t->task_state_lock);
                 t->task_state_flags |= SAS_TASK_AT_INITIATOR;
@@ -518,8 +514,7 @@ void pm8001_ccb_task_free(struct pm8001_hba_info *pm8001_ha,
 }
 
  /**
-  * pm8001_alloc_dev - find the empty pm8001_device structure, allocate and
-  * return it for use.
+  * pm8001_alloc_dev - find a empty pm8001_device
   * @pm8001_ha: our hba card information
   */
 struct pm8001_device *pm8001_alloc_dev(struct pm8001_hba_info *pm8001_ha)
@@ -550,14 +545,16 @@ static void pm8001_free_dev(struct pm8001_device *pm8001_dev)
 }
 
 /**
-  * pm8001_dev_found_notify - when libsas find a sas domain device, it should
-  * tell the LLDD that device is found, and then LLDD register this device to
-  * HBA FW by the command "OPC_INB_REG_DEV", after that the HBA will assign
-  * a device ID(according to device's sas address) and returned it to LLDD.from
+  * pm8001_dev_found_notify - libsas notify a device is found.
+  * @dev: the device structure which sas layer used.
+  *
+  * when libsas find a sas domain device, it should tell the LLDD that
+  * device is found, and then LLDD register this device to HBA firmware
+  * by the command "OPC_INB_REG_DEV", after that the HBA will assign a
+  * device ID(according to device's sas address) and returned it to LLDD. From
   * now on, we communicate with HBA FW with the device ID which HBA assigned
   * rather than sas address. it is the neccessary step for our HBA but it is
   * the optional for other HBA driver.
-  * @dev: the device structure which sas layer used.
   */
 static int pm8001_dev_found_notify(struct domain_device *dev)
 {
@@ -665,14 +662,15 @@ static void pm8001_tmf_timedout(unsigned long data)
 
 #define PM8001_TASK_TIMEOUT 20
 /**
-  * pm8001_exec_internal_tmf_task - when errors or exception happened, we may
-  * want to do something, for example abort issued task which result in this
-  * execption, this is by calling this function, note it is also with the task
-  * execute interface.
+  * pm8001_exec_internal_tmf_task - execute some task management commands.
   * @dev: the wanted device.
   * @tmf: which task management wanted to be take.
   * @para_len: para_len.
   * @parameter: ssp task parameter.
+  *
+  * when errors or exception happened, we may want to do something, for example
+  * abort the issued task which result in this execption, it is done by calling
+  * this function, note it is also with the task execute interface.
   */
 static int pm8001_exec_internal_tmf_task(struct domain_device *dev,
         void *parameter, u32 para_len, struct pm8001_tmf_task *tmf)
@@ -737,9 +735,9 @@ static int pm8001_exec_internal_tmf_task(struct domain_device *dev,
                         res = -EMSGSIZE;
                         break;
                 } else {
-                        PM8001_IO_DBG(pm8001_ha,
-                        pm8001_printk(" Task to dev %016llx response: 0x%x"
-                                "status 0x%x\n",
+                        PM8001_EH_DBG(pm8001_ha,
+                                pm8001_printk(" Task to dev %016llx response:"
+                                "0x%x status 0x%x\n",
                                 SAS_ADDR(dev->sas_addr),
                                 task->task_status.resp,
                                 task->task_status.stat));
@@ -760,7 +758,7 @@ pm8001_exec_internal_task_abort(struct pm8001_hba_info *pm8001_ha,
         u32 task_tag)
 {
         int res, retry;
-        u32 rc, ccb_tag;
+        u32 ccb_tag;
         struct pm8001_ccb_info *ccb;
         struct sas_task *task = NULL;
 
@@ -777,9 +775,9 @@ pm8001_exec_internal_task_abort(struct pm8001_hba_info *pm8001_ha,
                 task->timer.expires = jiffies + PM8001_TASK_TIMEOUT*HZ;
                 add_timer(&task->timer);
 
-                rc = pm8001_tag_alloc(pm8001_ha, &ccb_tag);
-                if (rc)
-                        return rc;
+                res = pm8001_tag_alloc(pm8001_ha, &ccb_tag);
+                if (res)
+                        return res;
                 ccb = &pm8001_ha->ccb_info[ccb_tag];
                 ccb->device = pm8001_dev;
                 ccb->ccb_tag = ccb_tag;
@@ -812,7 +810,7 @@ pm8001_exec_internal_task_abort(struct pm8001_hba_info *pm8001_ha,
                         break;
 
                 } else {
-                        PM8001_IO_DBG(pm8001_ha,
+                        PM8001_EH_DBG(pm8001_ha,
                                 pm8001_printk(" Task to dev %016llx response: "
                                         "0x%x status 0x%x\n",
                                 SAS_ADDR(dev->sas_addr),
@@ -1027,11 +1025,11 @@ int pm8001_abort_task(struct sas_task *task)
                 }
                 device_id = pm8001_dev->device_id;
                 PM8001_EH_DBG(pm8001_ha,
-                pm8001_printk("abort io to device_id = %d\n", device_id));
-                tmf_task.tmf =  TMF_ABORT_TASK;
+                        pm8001_printk("abort io to deviceid= %d\n", device_id));
+                tmf_task.tmf = TMF_ABORT_TASK;
                 tmf_task.tag_of_task_to_be_managed = tag;
                 rc = pm8001_issue_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
-                rc = pm8001_exec_internal_task_abort(pm8001_ha, pm8001_dev,
+                pm8001_exec_internal_task_abort(pm8001_ha, pm8001_dev,
                         pm8001_dev->sas_device, 0, tag);
         } else if (task->task_proto & SAS_PROTOCOL_SATA ||
                 task->task_proto & SAS_PROTOCOL_STP) {