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libata: workaround DRQ=1 ERR=1 for ATAPI tape drives

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After an error condition, some ATAPI tape drives set DRQ=1 together
with ERR=1 when asking the host to transfer the CDB of the next packet
command (i.e. request sense).  This patch, a revised version of
Alan/Mark's previous patch, adds ATA_HORKAGE_STUCK_ERR to workaround
the problem by ignoring the ERR bit and proceed sending the CDB.

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Mark Lord <liml@rtr.ca>
Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Albert Lee 2007-11-15 10:35:46 +09:00 committed by Tejun Heo
parent 21bef6dd2b
commit 2d3b8eea7f
2 changed files with 14 additions and 5 deletions
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18
drivers/ata/libata-core.c
View File

@ -5415,11 +5415,19 @@ fsm_start:
* let the EH abort the command or reset the device.
*/
if (unlikely(status & (ATA_ERR | ATA_DF))) {
ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
"error, dev_stat 0x%X\n", status);
qc->err_mask |= AC_ERR_HSM;
ap->hsm_task_state = HSM_ST_ERR;
goto fsm_start;
/* Some ATAPI tape drives forget to clear the ERR bit
* when doing the next command (mostly request sense).
* We ignore ERR here to workaround and proceed sending
* the CDB.
*/
if (!(qc->dev->horkage & ATA_HORKAGE_STUCK_ERR)) {
ata_port_printk(ap, KERN_WARNING,
"DRQ=1 with device error, "
"dev_stat 0x%X\n", status);
qc->err_mask |= AC_ERR_HSM;
ap->hsm_task_state = HSM_ST_ERR;
goto fsm_start;
}
}
/* Send the CDB (atapi) or the first data block (ata pio out).

1
include/linux/libata.h
View File

@ -340,6 +340,7 @@ enum {
ATA_HORKAGE_HPA_SIZE = (1 << 6), /* native size off by one */
ATA_HORKAGE_IPM = (1 << 7), /* Link PM problems */
ATA_HORKAGE_IVB = (1 << 8), /* cbl det validity bit bugs */
ATA_HORKAGE_STUCK_ERR = (1 << 9), /* stuck ERR on next PACKET */
/* DMA mask for user DMA control: User visible values; DO NOT
renumber */