mirror of
https://github.com/torvalds/linux.git
synced 2024-11-02 02:01:29 +00:00
[SCSI] ide-scsi: remove usage of sg_last()
We want to remove sg_last(), it's a very expensive interface. So keep track of number of sg entries in the sg list, instead of comparing with the last entry. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
parent
5804509e65
commit
c79d88b7fa
@ -70,7 +70,7 @@ typedef struct idescsi_pc_s {
|
||||
u8 *buffer; /* Data buffer */
|
||||
u8 *current_position; /* Pointer into the above buffer */
|
||||
struct scatterlist *sg; /* Scatter gather table */
|
||||
struct scatterlist *last_sg; /* Last sg element */
|
||||
unsigned int sg_cnt; /* Number of entries in sg */
|
||||
int b_count; /* Bytes transferred from current entry */
|
||||
struct scsi_cmnd *scsi_cmd; /* SCSI command */
|
||||
void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
|
||||
@ -192,7 +192,7 @@ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigne
|
||||
}
|
||||
bcount -= count; pc->b_count += count;
|
||||
if (pc->b_count == pc->sg->length) {
|
||||
if (pc->sg == pc->last_sg)
|
||||
if (!--pc->sg_cnt)
|
||||
break;
|
||||
pc->sg = sg_next(pc->sg);
|
||||
pc->b_count = 0;
|
||||
@ -229,7 +229,7 @@ static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsign
|
||||
}
|
||||
bcount -= count; pc->b_count += count;
|
||||
if (pc->b_count == pc->sg->length) {
|
||||
if (pc->sg == pc->last_sg)
|
||||
if (!--pc->sg_cnt)
|
||||
break;
|
||||
pc->sg = sg_next(pc->sg);
|
||||
pc->b_count = 0;
|
||||
@ -807,7 +807,7 @@ static int idescsi_queue (struct scsi_cmnd *cmd,
|
||||
memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
|
||||
pc->buffer = NULL;
|
||||
pc->sg = scsi_sglist(cmd);
|
||||
pc->last_sg = sg_last(pc->sg, scsi_sg_count(cmd));
|
||||
pc->sg_cnt = scsi_sg_count(cmd);
|
||||
pc->b_count = 0;
|
||||
pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
|
||||
pc->scsi_cmd = cmd;
|
||||
|
Loading…
Reference in New Issue
Block a user