diff options
Diffstat (limited to 'drivers/ata/libata-scsi.c')
| -rw-r--r-- | drivers/ata/libata-scsi.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index f70431a4c9e9..8a66ca5f9530 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -2551,10 +2551,6 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) goto invalid_fld; - if (cdb[1] & 0xe0) - /* PIO multi not supported yet */ - goto invalid_fld; - /* * 12 and 16 byte CDBs use different offsets to * provide the various register values. @@ -2606,6 +2602,22 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) tf->device = qc->dev->devno ? tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; + /* sanity check for pio multi commands */ + if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) + goto invalid_fld; + + if (is_multi_taskfile(tf)) { + unsigned int multi_count = 1 << (cdb[1] >> 5); + + /* compare the passed through multi_count + * with the cached multi_count of libata + */ + if (multi_count != dev->multi_count) + ata_dev_printk(dev, KERN_WARNING, + "invalid multi_count %u ignored\n", + multi_count); + } + /* READ/WRITE LONG use a non-standard sect_size */ qc->sect_size = ATA_SECT_SIZE; switch (tf->command) { |