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authorDan Williams <dan.j.williams@intel.com>2011-06-13 00:51:30 -0700
committerDan Williams <dan.j.williams@intel.com>2011-07-03 04:04:51 -0700
commit0d0cf14c9bd2943ed5afd15df459f564d85eacde (patch)
treeb996109708782750f7f3d58fea957b5cf19f0fa6 /drivers/scsi/isci/request.c
parent994a9303d33f8238d57f58c26067b6d4ac9af222 (diff)
isci: cleanup request allocation
Rather than return an error code and update a pointer that was passed by reference just return the request object directly (or null if allocation failed). Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/scsi/isci/request.c')
-rw-r--r--drivers/scsi/isci/request.c197
1 files changed, 67 insertions, 130 deletions
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index 9d7531ad9a74..f0813d076c50 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -3510,172 +3510,110 @@ static enum sci_status isci_io_request_build(
return SCI_SUCCESS;
}
-/**
- * isci_request_alloc_core() - This function gets the request object from the
- * isci_host dma cache.
- * @isci_host: This parameter specifies the ISCI host object
- * @isci_request: This parameter will contain the pointer to the new
- * isci_request object.
- * @isci_device: This parameter is the pointer to the isci remote device object
- * that is the destination for this request.
- * @gfp_flags: This parameter specifies the os allocation flags.
- *
- * SCI_SUCCESS on successfull completion, or specific failure code.
- */
-static int isci_request_alloc_core(
- struct isci_host *isci_host,
- struct isci_request **isci_request,
- struct isci_remote_device *isci_device,
- gfp_t gfp_flags)
+static struct isci_request *isci_request_alloc_core(struct isci_host *ihost,
+ struct isci_remote_device *idev,
+ gfp_t gfp_flags)
{
- int ret = 0;
dma_addr_t handle;
- struct isci_request *request;
-
+ struct isci_request *ireq;
- /* get pointer to dma memory. This actually points
- * to both the isci_remote_device object and the
- * sci object. The isci object is at the beginning
- * of the memory allocated here.
- */
- request = dma_pool_alloc(isci_host->dma_pool, gfp_flags, &handle);
- if (!request) {
- dev_warn(&isci_host->pdev->dev,
+ ireq = dma_pool_alloc(ihost->dma_pool, gfp_flags, &handle);
+ if (!ireq) {
+ dev_warn(&ihost->pdev->dev,
"%s: dma_pool_alloc returned NULL\n", __func__);
- return -ENOMEM;
+ return NULL;
}
/* initialize the request object. */
- spin_lock_init(&request->state_lock);
- request->request_daddr = handle;
- request->isci_host = isci_host;
- request->isci_device = isci_device;
- request->io_request_completion = NULL;
- request->terminated = false;
+ spin_lock_init(&ireq->state_lock);
+ ireq->request_daddr = handle;
+ ireq->isci_host = ihost;
+ ireq->isci_device = idev;
+ ireq->io_request_completion = NULL;
+ ireq->terminated = false;
- request->num_sg_entries = 0;
+ ireq->num_sg_entries = 0;
- request->complete_in_target = false;
+ ireq->complete_in_target = false;
- INIT_LIST_HEAD(&request->completed_node);
- INIT_LIST_HEAD(&request->dev_node);
+ INIT_LIST_HEAD(&ireq->completed_node);
+ INIT_LIST_HEAD(&ireq->dev_node);
- *isci_request = request;
- isci_request_change_state(request, allocated);
+ isci_request_change_state(ireq, allocated);
- return ret;
+ return ireq;
}
-static int isci_request_alloc_io(
- struct isci_host *isci_host,
- struct sas_task *task,
- struct isci_request **isci_request,
- struct isci_remote_device *isci_device,
- gfp_t gfp_flags)
+static struct isci_request *isci_request_alloc_io(struct isci_host *ihost,
+ struct sas_task *task,
+ struct isci_remote_device *idev,
+ gfp_t gfp_flags)
{
- int retval = isci_request_alloc_core(isci_host, isci_request,
- isci_device, gfp_flags);
-
- if (!retval) {
- (*isci_request)->ttype_ptr.io_task_ptr = task;
- (*isci_request)->ttype = io_task;
+ struct isci_request *ireq;
- task->lldd_task = *isci_request;
+ ireq = isci_request_alloc_core(ihost, idev, gfp_flags);
+ if (ireq) {
+ ireq->ttype_ptr.io_task_ptr = task;
+ ireq->ttype = io_task;
+ task->lldd_task = ireq;
}
- return retval;
+ return ireq;
}
-/**
- * isci_request_alloc_tmf() - This function gets the request object from the
- * isci_host dma cache and initializes the relevant fields as a sas_task.
- * @isci_host: This parameter specifies the ISCI host object
- * @sas_task: This parameter is the task struct from the upper layer driver.
- * @isci_request: This parameter will contain the pointer to the new
- * isci_request object.
- * @isci_device: This parameter is the pointer to the isci remote device object
- * that is the destination for this request.
- * @gfp_flags: This parameter specifies the os allocation flags.
- *
- * SCI_SUCCESS on successfull completion, or specific failure code.
- */
-int isci_request_alloc_tmf(
- struct isci_host *isci_host,
- struct isci_tmf *isci_tmf,
- struct isci_request **isci_request,
- struct isci_remote_device *isci_device,
- gfp_t gfp_flags)
+struct isci_request *isci_request_alloc_tmf(struct isci_host *ihost,
+ struct isci_tmf *isci_tmf,
+ struct isci_remote_device *idev,
+ gfp_t gfp_flags)
{
- int retval = isci_request_alloc_core(isci_host, isci_request,
- isci_device, gfp_flags);
-
- if (!retval) {
+ struct isci_request *ireq;
- (*isci_request)->ttype_ptr.tmf_task_ptr = isci_tmf;
- (*isci_request)->ttype = tmf_task;
+ ireq = isci_request_alloc_core(ihost, idev, gfp_flags);
+ if (ireq) {
+ ireq->ttype_ptr.tmf_task_ptr = isci_tmf;
+ ireq->ttype = tmf_task;
}
- return retval;
+ return ireq;
}
-/**
- * isci_request_execute() - This function allocates the isci_request object,
- * all fills in some common fields.
- * @isci_host: This parameter specifies the ISCI host object
- * @sas_task: This parameter is the task struct from the upper layer driver.
- * @isci_request: This parameter will contain the pointer to the new
- * isci_request object.
- * @gfp_flags: This parameter specifies the os allocation flags.
- *
- * SCI_SUCCESS on successfull completion, or specific failure code.
- */
-int isci_request_execute(
- struct isci_host *isci_host,
- struct sas_task *task,
- struct isci_request **isci_request,
- gfp_t gfp_flags)
+int isci_request_execute(struct isci_host *ihost, struct sas_task *task,
+ gfp_t gfp_flags)
{
- int ret = 0;
- struct scic_sds_remote_device *sci_device;
enum sci_status status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
- struct isci_remote_device *isci_device;
- struct isci_request *request;
+ struct scic_sds_remote_device *sci_dev;
+ struct isci_remote_device *idev;
+ struct isci_request *ireq;
unsigned long flags;
+ int ret = 0;
- isci_device = task->dev->lldd_dev;
- sci_device = &isci_device->sci;
+ idev = task->dev->lldd_dev;
+ sci_dev = &idev->sci;
/* do common allocation and init of request object. */
- ret = isci_request_alloc_io(
- isci_host,
- task,
- &request,
- isci_device,
- gfp_flags
- );
-
- if (ret)
+ ireq = isci_request_alloc_io(ihost, task, idev, gfp_flags);
+ if (!ireq)
goto out;
- status = isci_io_request_build(isci_host, request, isci_device);
+ status = isci_io_request_build(ihost, ireq, idev);
if (status != SCI_SUCCESS) {
- dev_warn(&isci_host->pdev->dev,
+ dev_warn(&ihost->pdev->dev,
"%s: request_construct failed - status = 0x%x\n",
__func__,
status);
goto out;
}
- spin_lock_irqsave(&isci_host->scic_lock, flags);
+ spin_lock_irqsave(&ihost->scic_lock, flags);
/* send the request, let the core assign the IO TAG. */
- status = scic_controller_start_io(&isci_host->sci, sci_device,
- &request->sci,
+ status = scic_controller_start_io(&ihost->sci, sci_dev,
+ &ireq->sci,
SCI_CONTROLLER_INVALID_IO_TAG);
if (status != SCI_SUCCESS &&
status != SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
- dev_warn(&isci_host->pdev->dev,
+ dev_warn(&ihost->pdev->dev,
"%s: failed request start (0x%x)\n",
__func__, status);
- spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
goto out;
}
@@ -3687,21 +3625,21 @@ int isci_request_execute(
* Update it's status and add it to the list in the
* remote device object.
*/
- list_add(&request->dev_node, &isci_device->reqs_in_process);
+ list_add(&ireq->dev_node, &idev->reqs_in_process);
if (status == SCI_SUCCESS) {
/* Save the tag for possible task mgmt later. */
- request->io_tag = request->sci.io_tag;
- isci_request_change_state(request, started);
+ ireq->io_tag = ireq->sci.io_tag;
+ isci_request_change_state(ireq, started);
} else {
/* The request did not really start in the
* hardware, so clear the request handle
* here so no terminations will be done.
*/
- request->terminated = true;
- isci_request_change_state(request, completed);
+ ireq->terminated = true;
+ isci_request_change_state(ireq, completed);
}
- spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (status ==
SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
@@ -3716,7 +3654,7 @@ int isci_request_execute(
/* Cause this task to be scheduled in the SCSI error
* handler thread.
*/
- isci_execpath_callback(isci_host, task,
+ isci_execpath_callback(ihost, task,
sas_task_abort);
/* Change the status, since we are holding
@@ -3729,11 +3667,10 @@ int isci_request_execute(
out:
if (status != SCI_SUCCESS) {
/* release dma memory on failure. */
- isci_request_free(isci_host, request);
- request = NULL;
+ isci_request_free(ihost, ireq);
+ ireq = NULL;
ret = SCI_FAILURE;
}
- *isci_request = request;
return ret;
}

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