diff options
| author | Albert Lee <albertcc@tw.ibm.com> | 2007-11-15 10:35:46 +0900 |
|---|---|---|
| committer | Tejun Heo <htejun@gmail.com> | 2007-11-19 12:28:11 +0900 |
| commit | 2d3b8eea7f2fbafd5d779cc92f7aedbd1ef575e9 (patch) | |
| tree | 292cd6197c457defc3e07d02a663cabb3dceb253 | |
| parent | 21bef6dd2b419f28c8096a8e30ad86dcbff44c02 (diff) | |
libata: workaround DRQ=1 ERR=1 for ATAPI tape drives
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>
| -rw-r--r-- | drivers/ata/libata-core.c | 18 | ||||
| -rw-r--r-- | include/linux/libata.h | 1 |
2 files changed, 14 insertions, 5 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 1584164e770..5478b4c6c6e 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -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). diff --git a/include/linux/libata.h b/include/linux/libata.h index 3f9a6a140a9..ef52a07c43d 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -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 */ |