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libata: call ata_check_atapi_dma() with qc better prepared 

In atapi_xlat(), prepare qc better before calling
ata_check_atapi_dma() such that ata_check_atapi_dma() can use info
from qc.  While at it, reformat weird looking if/else block in the
function.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-06-27 02:47:35 +09:00 committed by Jeff Garzik
parent 914616a3c2
commit e00f1ff3c8
1 changed files with 8 additions and 12 deletions
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20
drivers/ata/libata-scsi.c
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@ -2384,11 +2384,6 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
int using_pio = (dev->flags & ATA_DFLAG_PIO);
int nodata = (scmd->sc_data_direction == DMA_NONE);
if (!using_pio)
/* Check whether ATAPI DMA is safe */
if (ata_check_atapi_dma(qc))
using_pio = 1;
memset(qc->cdb, 0, dev->cdb_len);
memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
@ -2401,19 +2396,22 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
}
qc->tf.command = ATA_CMD_PACKET;
qc->nbytes = scmd->request_bufflen;
/* check whether ATAPI DMA is safe */
if (!using_pio && ata_check_atapi_dma(qc))
using_pio = 1;
/* no data, or PIO data xfer */
if (using_pio || nodata) {
/* no data, or PIO data xfer */
if (nodata)
qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
else
qc->tf.protocol = ATA_PROT_ATAPI;
qc->tf.lbam = (8 * 1024) & 0xff;
qc->tf.lbah = (8 * 1024) >> 8;
}
/* DMA data xfer */
else {
} else {
/* DMA data xfer */
qc->tf.protocol = ATA_PROT_ATAPI_DMA;
qc->tf.feature |= ATAPI_PKT_DMA;
@ -2422,8 +2420,6 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
qc->tf.feature |= ATAPI_DMADIR;
}
qc->nbytes = scmd->request_bufflen;
return 0;
}