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@xxxxxxxxxx> --- I guess maybe other commands like READ_DVD_STRUCTURE and READ_CD also work under ATAPI DMA, but not confirmed by Vlad yet. So, allow ATAPI DMA only for Read/Write here for safty. Patch against libata-dev tree, for your review, thanks. diff -Nrup 03_max_sect/drivers/ata/libata-core.c 04_dma_rw_only/drivers/ata/libata-core.c --- 03_max_sect/drivers/ata/libata-core.c 2007-03-31 14:11:33.000000000 +0800 +++ 04_dma_rw_only/drivers/ata/libata-core.c 2007-03-31 14:27:47.000000000 +0800 @@ -1787,6 +1787,10 @@ int ata_dev_configure(struct ata_device if (ata_device_blacklisted(dev) & ATA_HORKAGE_MAX_SEC_240) dev->max_sectors = min(ATA_MAX_SECTORS_240, 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 { "SAMSUNG CD-ROM SN-124","N001", ATA_HORKAGE_NODMA }, /* Weird ATAPI devices */ - { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_240 }, + { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_240 | + ATA_HORKAGE_DMA_RW_ONLY }, /* Devices we expect to fail diagnostics */ @@ -3676,6 +3681,26 @@ int ata_check_atapi_dma(struct ata_queue 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); diff -Nrup 03_max_sect/include/linux/libata.h 04_dma_rw_only/include/linux/libata.h --- 03_max_sect/include/linux/libata.h 2007-03-31 14:07:49.000000000 +0800 +++ 04_dma_rw_only/include/linux/libata.h 2007-03-31 14:08:31.000000000 +0800 @@ -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_240 = (1 << 3), /* Limit max sects below 256 */ + ATA_HORKAGE_DMA_RW_ONLY = (1 << 4), /* ATAPI DMA for RW only */ }; enum hsm_task_states { - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
