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@xxxxxxxxx>
---
drivers/ata/libata-scsi.c | 20 ++++++++------------
1 file changed, 8 insertions(+), 12 deletions(-)
Index: work/drivers/ata/libata-scsi.c
===================================================================
--- work.orig/drivers/ata/libata-scsi.c
+++ work/drivers/ata/libata-scsi.c
@@ -2384,11 +2384,6 @@ static unsigned int atapi_xlat(struct at
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 at
}
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 at
qc->tf.feature |= ATAPI_DMADIR;
}
- qc->nbytes = scmd->request_bufflen;
-
return 0;
}
-
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