diff options
| author | Mark Lord <liml@rtr.ca> | 2007-11-15 13:13:59 +0900 |
|---|---|---|
| committer | Tejun Heo <htejun@gmail.com> | 2007-11-19 12:28:11 +0900 |
| commit | 607126c2a21cd6e9bb807fdd415c1a992f7b9009 (patch) | |
| tree | ec383bc937b0a19b8da4e1c02a3191ea625f40db /drivers/ata/libata-scsi.c | |
| parent | f442cd86c1c86c5f44bc2cf23f89536f7e4cfe59 (diff) | |
| download | lwn-607126c2a21cd6e9bb807fdd415c1a992f7b9009.tar.gz lwn-607126c2a21cd6e9bb807fdd415c1a992f7b9009.zip | |
libata-scsi: be tolerant of 12-byte ATAPI commands in 16-byte CDBs
Sebastian Kemper reported that issuing CD/DVD commands under libata is
not fully compatible with ide-scsi. In particular, the
GPCMD_SET_STREAMING was being rejected at the host level in some
instances.
The reason is that libata-scsi insists upon the cmd_len field exactly
matching the SCSI opcode being issued, whereas ide-scsi tolerates
12-byte commands contained within a 16-byte (cmd_len) CDB.
There doesn't seem to be a good reason for us to not be compatible
there, so here is a patch to fix libata-scsi to permit SCSI opcodes so
long as they fit within whatever size CDB is provided.
Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Tejun Heo <htejun@gmail.com>
Diffstat (limited to 'drivers/ata/libata-scsi.c')
| -rw-r--r-- | drivers/ata/libata-scsi.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 94144ed50a6b..a45f6ac3b245 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -2869,7 +2869,8 @@ static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, xlat_func = NULL; if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { /* relay SCSI command to ATAPI device */ - if (unlikely(scmd->cmd_len > dev->cdb_len)) + int len = COMMAND_SIZE(scsi_op); + if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) goto bad_cdb_len; xlat_func = atapi_xlat; |