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isci: fix dma_unmap_sg usage 

One bug and a cleanup:
1/ Fix cases where we were unmapping invalid addresses (smp requests were
   being unmapped)

[  604.662770] ------------[ cut here ]------------
[  604.668026] WARNING: at lib/dma-debug.c:800 check_unmap+0x418/0x740()
[  604.675315] Hardware name: SandyBridge Platform
[  604.680465] isci 0000:03:00.0: DMA-API: device driver tries to free an invalid DMA memory address

2/ The unmap routine is too large to be an inline function, and
   isci_request_io_request_get_next_sge is unused.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2011-06-17 10:40:43 -07:00
parent 5edc33480c
commit ddcc7e347a
2 changed files with 18 additions and 90 deletions
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17
drivers/scsi/isci/request.c
View File

@ -2930,7 +2930,22 @@ static void isci_request_io_request_complete(struct isci_host *isci_host,
break;
}
isci_request_unmap_sgl(request, isci_host->pdev);
switch (task->task_proto) {
case SAS_PROTOCOL_SSP:
if (task->data_dir == DMA_NONE)
break;
if (task->num_scatter == 0)
/* 0 indicates a single dma address */
dma_unmap_single(&isci_host->pdev->dev,
request->zero_scatter_daddr,
task->total_xfer_len, task->data_dir);
else /* unmap the sgl dma addresses */
dma_unmap_sg(&isci_host->pdev->dev, task->scatter,
request->num_sg_entries, task->data_dir);
break;
default:
break;
}
/* Put the completed request on the correct list */
isci_task_save_for_upper_layer_completion(isci_host, request, response,

91
drivers/scsi/isci/request.h
View File

@ -672,97 +672,10 @@ static inline void isci_request_free(struct isci_host *isci_host,
struct isci_request *isci_request_alloc_tmf(struct isci_host *ihost,
struct isci_tmf *isci_tmf,
gfp_t gfp_flags);
int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
struct sas_task *task, gfp_t gfp_flags);
/**
* isci_request_unmap_sgl() - This function unmaps the DMA address of a given
* sgl
* @request: This parameter points to the isci_request object
* @*pdev: This Parameter is the pci_device struct for the controller
*
*/
static inline void
isci_request_unmap_sgl(struct isci_request *request, struct pci_dev *pdev)
{
struct sas_task *task = isci_request_access_task(request);
dev_dbg(&request->isci_host->pdev->dev,
"%s: request = %p, task = %p,\n"
"task->data_dir = %d, is_sata = %d\n ",
__func__,
request,
task,
task->data_dir,
sas_protocol_ata(task->task_proto));
if ((task->data_dir != PCI_DMA_NONE) &&
!sas_protocol_ata(task->task_proto)) {
if (task->num_scatter == 0)
/* 0 indicates a single dma address */
dma_unmap_single(
&pdev->dev,
request->zero_scatter_daddr,
task->total_xfer_len,
task->data_dir
);
else /* unmap the sgl dma addresses */
dma_unmap_sg(
&pdev->dev,
task->scatter,
request->num_sg_entries,
task->data_dir
);
}
}
/**
* isci_request_io_request_get_next_sge() - This function is called by the sci
* core to retrieve the next sge for a given request.
* @request: This parameter is the isci_request object.
* @current_sge_address: This parameter is the last sge retrieved by the sci
* core for this request.
*
* pointer to the next sge for specified request.
*/
static inline void *
isci_request_io_request_get_next_sge(struct isci_request *request,
void *current_sge_address)
{
struct sas_task *task = isci_request_access_task(request);
void *ret = NULL;
dev_dbg(&request->isci_host->pdev->dev,
"%s: request = %p, "
"current_sge_address = %p, "
"num_scatter = %d\n",
__func__,
request,
current_sge_address,
task->num_scatter);
if (!current_sge_address) /* First time through.. */
ret = task->scatter; /* always task->scatter */
else if (task->num_scatter == 0) /* Next element, if num_scatter == 0 */
ret = NULL; /* there is only one element. */
else
ret = sg_next(current_sge_address); /* sg_next returns NULL
* for the last element
*/
dev_dbg(&request->isci_host->pdev->dev,
"%s: next sge address = %p\n",
__func__,
ret);
return ret;
}
void
isci_terminate_pending_requests(struct isci_host *ihost,
struct isci_remote_device *idev);
void isci_terminate_pending_requests(struct isci_host *ihost,
struct isci_remote_device *idev);
enum sci_status
scic_task_request_construct(struct scic_sds_controller *scic,
struct scic_sds_remote_device *sci_dev,