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skd: Simplify the code for handling data direction 

Use DMA_FROM_DEVICE and DMA_TO_DEVICE directly instead of
introducing driver-private constants with the same numerical
value.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2017-08-17 13:13:12 -07:00 committed by Jens Axboe
parent 0b2e0c0772
commit b1824eef28
1 changed files with 9 additions and 16 deletions
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25
drivers/block/skd_main.c
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@ -212,7 +212,7 @@ struct skd_request_context {
u8 flush_cmd;
u32 timeout_stamp;
u8 sg_data_dir;
enum dma_data_direction data_dir;
struct scatterlist *sg;
u32 n_sg;
u32 sg_byte_count;
@ -225,8 +225,6 @@ struct skd_request_context {
struct fit_comp_error_info err_info;
};
#define SKD_DATA_DIR_HOST_TO_CARD 1
#define SKD_DATA_DIR_CARD_TO_HOST 2
struct skd_special_context {
struct skd_request_context req;
@ -615,8 +613,8 @@ static void skd_request_fn(struct request_queue *q)
skreq->req = req;
skreq->fitmsg_id = 0;
skreq->sg_data_dir = data_dir == READ ?
SKD_DATA_DIR_CARD_TO_HOST : SKD_DATA_DIR_HOST_TO_CARD;
skreq->data_dir = data_dir == READ ? DMA_FROM_DEVICE :
DMA_TO_DEVICE;
if (req->bio && !skd_preop_sg_list(skdev, skreq)) {
dev_dbg(&skdev->pdev->dev, "error Out\n");
@ -742,16 +740,14 @@ static bool skd_preop_sg_list(struct skd_device *skdev,
struct skd_request_context *skreq)
{
struct request *req = skreq->req;
int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
struct scatterlist *sg = &skreq->sg[0];
int n_sg;
int i;
skreq->sg_byte_count = 0;
/* SKD_ASSERT(skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD ||
skreq->sg_data_dir == SKD_DATA_DIR_CARD_TO_HOST); */
WARN_ON_ONCE(skreq->data_dir != DMA_TO_DEVICE &&
skreq->data_dir != DMA_FROM_DEVICE);
n_sg = blk_rq_map_sg(skdev->queue, req, sg);
if (n_sg <= 0)
@ -761,7 +757,7 @@ static bool skd_preop_sg_list(struct skd_device *skdev,
* Map scatterlist to PCI bus addresses.
* Note PCI might change the number of entries.
*/
n_sg = pci_map_sg(skdev->pdev, sg, n_sg, pci_dir);
n_sg = pci_map_sg(skdev->pdev, sg, n_sg, skreq->data_dir);
if (n_sg <= 0)
return false;
@ -804,9 +800,6 @@ static bool skd_preop_sg_list(struct skd_device *skdev,
static void skd_postop_sg_list(struct skd_device *skdev,
struct skd_request_context *skreq)
{
int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
/*
* restore the next ptr for next IO request so we
* don't have to set it every time.
@ -814,7 +807,7 @@ static void skd_postop_sg_list(struct skd_device *skdev,
skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr =
skreq->sksg_dma_address +
((skreq->n_sg) * sizeof(struct fit_sg_descriptor));
pci_unmap_sg(skdev->pdev, &skreq->sg[0], skreq->n_sg, pci_dir);
pci_unmap_sg(skdev->pdev, &skreq->sg[0], skreq->n_sg, skreq->data_dir);
}
static void skd_request_fn_not_online(struct request_queue *q)
@ -2506,7 +2499,7 @@ static void skd_process_scsi_inq(struct skd_device *skdev,
struct skd_scsi_request *scsi_req = &skspcl->msg_buf->scsi[0];
dma_sync_sg_for_cpu(skdev->class_dev, skspcl->req.sg, skspcl->req.n_sg,
skspcl->req.sg_data_dir);
skspcl->req.data_dir);
buf = skd_sg_1st_page_ptr(skspcl->req.sg);
if (buf)
@ -4935,7 +4928,7 @@ static void skd_log_skreq(struct skd_device *skdev,
skd_skreq_state_to_str(skreq->state), skreq->state, skreq->id,
skreq->fitmsg_id);
dev_dbg(&skdev->pdev->dev, " timo=0x%x sg_dir=%d n_sg=%d\n",
skreq->timeout_stamp, skreq->sg_data_dir, skreq->n_sg);
skreq->timeout_stamp, skreq->data_dir, skreq->n_sg);
if (skreq->req != NULL) {
struct request *req = skreq->req;