ata: libata-scsi: ignore reserved bits for REPORT SUPPORTED OPERATION CODES

For REPORT SUPPORTED OPERATION CODES command, the service action field is
defined as bits 0-4 in the second byte in the CDB. Bits 5-7 in the second
byte are reserved.

Only look at the service action field in the second byte when determining
if the MAINTENANCE IN opcode is a REPORT SUPPORTED OPERATION CODES command.

This matches how we only look at the service action field in the second
byte when determining if the SERVICE ACTION IN(16) opcode is a READ
CAPACITY(16) command (reserved bits 5-7 in the second byte are ignored).

Fixes: 7b2030942859 ("libata: Add support for SCT Write Same")
Cc: stable@vger.kernel.org
Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index d3f28b8..fb73c14 100644 (file)
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -4312,7 +4312,7 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
                break;
 
        case MAINTENANCE_IN:
-               if (scsicmd[1] == MI_REPORT_SUPPORTED_OPERATION_CODES)
+               if ((scsicmd[1] & 0x1f) == MI_REPORT_SUPPORTED_OPERATION_CODES)
                        ata_scsi_rbuf_fill(&args, ata_scsiop_maint_in);
                else
                        ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);