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[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>
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@ -70,7 +70,7 @@ typedef struct idescsi_pc_s {
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u8 *buffer; /* Data buffer */
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u8 *current_position; /* Pointer into the above buffer */
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struct scatterlist *sg; /* Scatter gather table */
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struct scatterlist *last_sg; /* Last sg element */
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unsigned int sg_cnt; /* Number of entries in sg */
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int b_count; /* Bytes transferred from current entry */
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struct scsi_cmnd *scsi_cmd; /* SCSI command */
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void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
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@ -192,7 +192,7 @@ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigne
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}
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bcount -= count; pc->b_count += count;
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if (pc->b_count == pc->sg->length) {
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if (pc->sg == pc->last_sg)
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if (!--pc->sg_cnt)
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break;
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pc->sg = sg_next(pc->sg);
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pc->b_count = 0;
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@ -229,7 +229,7 @@ static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsign
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}
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bcount -= count; pc->b_count += count;
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if (pc->b_count == pc->sg->length) {
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if (pc->sg == pc->last_sg)
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if (!--pc->sg_cnt)
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break;
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pc->sg = sg_next(pc->sg);
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pc->b_count = 0;
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@ -807,7 +807,7 @@ static int idescsi_queue (struct scsi_cmnd *cmd,
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memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
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pc->buffer = NULL;
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pc->sg = scsi_sglist(cmd);
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pc->last_sg = sg_last(pc->sg, scsi_sg_count(cmd));
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pc->sg_cnt = scsi_sg_count(cmd);
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pc->b_count = 0;
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pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
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pc->scsi_cmd = cmd;
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