libata-scsi: Remove !use_sg code paths
This is a minimal patch needed to remove use of !use_sg but it is not a complete clean up of the !use_sg paths. Libata-core still has the qc->flags & ATA_QCFLAG_SG and !qc->n_elem code paths. Perhaps an ata maintainer would have a go at it. - TODO: further cleanup of qc->flags & ATA_QCFLAG_SG and !qc->n_elem code paths in libata-core - TODO: Use scsi_dma_{map,unmap} where applicable. Signed-off-by: Jeff Garzik <jeff@garzik.org>
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@ -450,13 +450,8 @@ static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
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qc->scsicmd = cmd;
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qc->scsidone = done;
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if (cmd->use_sg) {
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qc->__sg = (struct scatterlist *) cmd->request_buffer;
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qc->n_elem = cmd->use_sg;
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} else if (cmd->request_bufflen) {
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qc->__sg = &qc->sgent;
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qc->n_elem = 1;
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}
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qc->__sg = (struct scatterlist *) cmd->request_buffer;
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qc->n_elem = cmd->use_sg;
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} else {
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cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
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done(cmd);
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@ -1504,11 +1499,7 @@ static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
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goto err_did;
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}
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if (cmd->use_sg)
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ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
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else
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ata_sg_init_one(qc, cmd->request_buffer,
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cmd->request_bufflen);
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ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
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qc->dma_dir = cmd->sc_data_direction;
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}
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@ -1562,15 +1553,14 @@ static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
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u8 *buf;
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unsigned int buflen;
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if (cmd->use_sg) {
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struct scatterlist *sg;
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struct scatterlist *sg = (struct scatterlist *) cmd->request_buffer;
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sg = (struct scatterlist *) cmd->request_buffer;
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if (sg) {
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buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
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buflen = sg->length;
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} else {
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buf = cmd->request_buffer;
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buflen = cmd->request_bufflen;
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buf = NULL;
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buflen = 0;
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}
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*buf_out = buf;
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@ -1590,12 +1580,9 @@ static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
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static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
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{
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if (cmd->use_sg) {
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struct scatterlist *sg;
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sg = (struct scatterlist *) cmd->request_buffer;
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struct scatterlist *sg = (struct scatterlist *) cmd->request_buffer;
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if (sg)
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kunmap_atomic(buf - sg->offset, KM_IRQ0);
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}
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}
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/**
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