libata: Limit ATAPI DMA to R/W commands only for TORiSAN DVD drives (take 3)
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>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 84f6f85..cf2338c 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1787,6 +1787,10 @@
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 @@
{ "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 @@
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);