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libata: Limit ATAPI DMA to R/W commands only for TORiSAN DVD drives (take 3)

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patch 4/4:

  Limit ATAPI DMA to R/W commands only for TORiSAN DRD-N216 DVD-ROM drives
  (http://bugzilla.kernel.org/show_bug.cgi?id=6710)

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 11:39:25 +08:00 committed by Jeff Garzik
parent 18d6e9d518
commit 6f23a31d1c
2 changed files with 27 additions and 1 deletions
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27
drivers/ata/libata-core.c
View file

@ -1787,6 +1787,10 @@ int ata_dev_configure(struct ata_device *dev)
if (ata_device_blacklisted(dev) & ATA_HORKAGE_MAX_SEC_128)
dev->max_sectors = min(ATA_MAX_SECTORS_128, dev->max_sectors);
/* limit ATAPI DMA to R/W commands only */
if (ata_device_blacklisted(dev) & ATA_HORKAGE_DMA_RW_ONLY)
dev->horkage |= ATA_HORKAGE_DMA_RW_ONLY;
if (ap->ops->dev_config)
ap->ops->dev_config(ap, dev);
@ -3356,7 +3360,8 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
{ "SAMSUNG CD-ROM SN-124","N001", ATA_HORKAGE_NODMA },
/* Weird ATAPI devices */
{ "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
{ "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 |
ATA_HORKAGE_DMA_RW_ONLY },
/* Devices we expect to fail diagnostics */
@ -3680,6 +3685,26 @@ int ata_check_atapi_dma(struct ata_queued_cmd *qc)
struct ata_port *ap = qc->ap;
int rc = 0; /* Assume ATAPI DMA is OK by default */
/* some drives can only do ATAPI DMA on read/write */
if (unlikely(qc->dev->horkage & ATA_HORKAGE_DMA_RW_ONLY)) {
struct scsi_cmnd *cmd = qc->scsicmd;
u8 *scsicmd = cmd->cmnd;
switch (scsicmd[0]) {
case READ_10:
case WRITE_10:
case READ_12:
case WRITE_12:
case READ_6:
case WRITE_6:
/* atapi dma maybe ok */
break;
default:
/* turn off atapi dma */
return 1;
}
}
if (ap->ops->check_atapi_dma)
rc = ap->ops->check_atapi_dma(qc);

1
include/linux/libata.h
View file

@ -312,6 +312,7 @@ enum {
ATA_HORKAGE_NODMA = (1 << 1), /* DMA problems */
ATA_HORKAGE_NONCQ = (1 << 2), /* Don't use NCQ */
ATA_HORKAGE_MAX_SEC_128 = (1 << 3), /* Limit max sects to 128 */
ATA_HORKAGE_DMA_RW_ONLY = (1 << 4), /* ATAPI DMA for RW only */
};
enum hsm_task_states {