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libata: Clear tf before doing request sense (take 3) 

patch 2/4:
  Clear tf before doing request sense.

This fixes the AOpen 56X/AKH timeout problem.
(http://bugzilla.kernel.org/show_bug.cgi?id=8244)

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Albert Lee 2007-04-02 11:30:46 +08:00 committed by Jeff Garzik
parent 7152764700
commit 56287768e3
1 changed files with 11 additions and 11 deletions
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22
drivers/ata/libata-eh.c
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@ -982,26 +982,27 @@ static int ata_eh_read_log_10h(struct ata_device *dev,
* RETURNS:
* 0 on success, AC_ERR_* mask on failure
*/
static unsigned int atapi_eh_request_sense(struct ata_device *dev,
unsigned char *sense_buf)
static unsigned int atapi_eh_request_sense(struct ata_queued_cmd *qc)
{
struct ata_device *dev = qc->dev;
unsigned char *sense_buf = qc->scsicmd->sense_buffer;
struct ata_port *ap = dev->ap;
struct ata_taskfile tf;
u8 cdb[ATAPI_CDB_LEN];
DPRINTK("ATAPI request sense\n");
ata_tf_init(dev, &tf);
/* FIXME: is this needed? */
memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
/* XXX: why tf_read here? */
ap->ops->tf_read(ap, &tf);
/* fill these in, for the case where they are -not- overwritten */
/* initialize sense_buf with the error register,
* for the case where they are -not- overwritten
*/
sense_buf[0] = 0x70;
sense_buf[2] = tf.feature >> 4;
sense_buf[2] = qc->result_tf.feature >> 4;
/* some devices time out if garbage left in tf */
ata_tf_init(dev, &tf);
memset(cdb, 0, ATAPI_CDB_LEN);
cdb[0] = REQUEST_SENSE;
@ -1165,8 +1166,7 @@ static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc,
case ATA_DEV_ATAPI:
if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) {
tmp = atapi_eh_request_sense(qc->dev,
qc->scsicmd->sense_buffer);
tmp = atapi_eh_request_sense(qc);
if (!tmp) {
/* ATA_QCFLAG_SENSE_VALID is used to
* tell atapi_qc_complete() that sense