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Commit 542b1444 authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik
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[PATCH] libata: clean up variable name usage in xlat related functions 

Variable names in xlat functions are quite confusing now.  'scsicmd'
is used for CDB while qc->scsicmd points to struct scsi_cmnd while
'cmd' is used for struct scsi_cmnd.

This patch cleans up variable names in xlat functions such that 'scmd'
is used for struct scsi_cmnd and 'cdb' for CDB.  Also, 'scmd' local
variable is added if qc->scsicmd is used multiple times.
Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 6fbf5ba4
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Showing with 105 additions and 112 deletions
drivers/ata/libata-scsi.c
View file @ 542b1444
......@@ -51,7 +51,7 @@
#define SECTOR_SIZE 512
typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, const u8 *scsicmd);
typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, const u8 *cdb);
static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
const struct scsi_device *scsidev);
......@@ -935,7 +935,7 @@ int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
/**
* ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
* @qc: Storage for translated ATA taskfile
* @scsicmd: SCSI command to translate
* @cdb: SCSI command to translate
*
* Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
* (to start). Perhaps these commands should be preceded by
......@@ -948,22 +948,22 @@ int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
* RETURNS:
* Zero on success, non-zero on error.
*/
static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
const u8 *scsicmd)
const u8 *cdb)
{
struct scsi_cmnd *scmd = qc->scsicmd;
struct ata_taskfile *tf = &qc->tf;
tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
tf->protocol = ATA_PROT_NODATA;
if (scsicmd[1] & 0x1) {
if (cdb[1] & 0x1) {
; /* ignore IMMED bit, violates sat-r05 */
}
if (scsicmd[4] & 0x2)
if (cdb[4] & 0x2)
goto invalid_fld; /* LOEJ bit set not supported */
if (((scsicmd[4] >> 4) & 0xf) != 0)
if (((cdb[4] >> 4) & 0xf) != 0)
goto invalid_fld; /* power conditions not supported */
if (scsicmd[4] & 0x1) {
if (cdb[4] & 0x1) {
tf->nsect = 1; /* 1 sector, lba=0 */
if (qc->dev->flags & ATA_DFLAG_LBA) {
......@@ -996,7 +996,7 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
return 0;
invalid_fld:
ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
/* "Invalid field in cbd" */
return 1;
}
......@@ -1005,7 +1005,7 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
/**
* ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
* @qc: Storage for translated ATA taskfile
* @scsicmd: SCSI command to translate (ignored)
* @cdb: SCSI command to translate (ignored)
*
* Sets up an ATA taskfile to issue FLUSH CACHE or
* FLUSH CACHE EXT.
......@@ -1016,8 +1016,7 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
* RETURNS:
* Zero on success, non-zero on error.
*/
static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, const u8 *cdb)
{
struct ata_taskfile *tf = &qc->tf;
......@@ -1034,7 +1033,7 @@ static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, const u8 *scs
/**
* scsi_6_lba_len - Get LBA and transfer length
* @scsicmd: SCSI command to translate
* @cdb: SCSI command to translate
*
* Calculate LBA and transfer length for 6-byte commands.
*
......@@ -1042,18 +1041,17 @@ static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, const u8 *scs
* @plba: the LBA
* @plen: the transfer length
*/
static void scsi_6_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
{
u64 lba = 0;
u32 len = 0;
VPRINTK("six-byte command\n");
lba |= ((u64)scsicmd[2]) << 8;
lba |= ((u64)scsicmd[3]);
lba |= ((u64)cdb[2]) << 8;
lba |= ((u64)cdb[3]);
len |= ((u32)scsicmd[4]);
len |= ((u32)cdb[4]);
*plba = lba;
*plen = len;
......@@ -1061,7 +1059,7 @@ static void scsi_6_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
/**
* scsi_10_lba_len - Get LBA and transfer length
* @scsicmd: SCSI command to translate
* @cdb: SCSI command to translate
*
* Calculate LBA and transfer length for 10-byte commands.
*
......@@ -1069,21 +1067,20 @@ static void scsi_6_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
* @plba: the LBA
* @plen: the transfer length
*/
static void scsi_10_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
{
u64 lba = 0;
u32 len = 0;
VPRINTK("ten-byte command\n");
lba |= ((u64)scsicmd[2]) << 24;
lba |= ((u64)scsicmd[3]) << 16;
lba |= ((u64)scsicmd[4]) << 8;
lba |= ((u64)scsicmd[5]);
lba |= ((u64)cdb[2]) << 24;
lba |= ((u64)cdb[3]) << 16;
lba |= ((u64)cdb[4]) << 8;
lba |= ((u64)cdb[5]);
len |= ((u32)scsicmd[7]) << 8;
len |= ((u32)scsicmd[8]);
len |= ((u32)cdb[7]) << 8;
len |= ((u32)cdb[8]);
*plba = lba;
*plen = len;
......@@ -1091,7 +1088,7 @@ static void scsi_10_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
/**
* scsi_16_lba_len - Get LBA and transfer length
* @scsicmd: SCSI command to translate
* @cdb: SCSI command to translate
*
* Calculate LBA and transfer length for 16-byte commands.
*
......@@ -1099,27 +1096,26 @@ static void scsi_10_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
* @plba: the LBA
* @plen: the transfer length
*/
static void scsi_16_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
{
u64 lba = 0;
u32 len = 0;
VPRINTK("sixteen-byte command\n");
lba |= ((u64)scsicmd[2]) << 56;
lba |= ((u64)scsicmd[3]) << 48;
lba |= ((u64)scsicmd[4]) << 40;
lba |= ((u64)scsicmd[5]) << 32;
lba |= ((u64)scsicmd[6]) << 24;
lba |= ((u64)scsicmd[7]) << 16;
lba |= ((u64)scsicmd[8]) << 8;
lba |= ((u64)scsicmd[9]);
lba |= ((u64)cdb[2]) << 56;
lba |= ((u64)cdb[3]) << 48;
lba |= ((u64)cdb[4]) << 40;
lba |= ((u64)cdb[5]) << 32;
lba |= ((u64)cdb[6]) << 24;
lba |= ((u64)cdb[7]) << 16;
lba |= ((u64)cdb[8]) << 8;
lba |= ((u64)cdb[9]);
len |= ((u32)scsicmd[10]) << 24;
len |= ((u32)scsicmd[11]) << 16;
len |= ((u32)scsicmd[12]) << 8;
len |= ((u32)scsicmd[13]);
len |= ((u32)cdb[10]) << 24;
len |= ((u32)cdb[11]) << 16;
len |= ((u32)cdb[12]) << 8;
len |= ((u32)cdb[13]);
*plba = lba;
*plen = len;
......@@ -1128,7 +1124,7 @@ static void scsi_16_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
/**
* ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
* @qc: Storage for translated ATA taskfile
* @scsicmd: SCSI command to translate
* @cdb: SCSI command to translate
*
* Converts SCSI VERIFY command to an ATA READ VERIFY command.
*
......@@ -1138,9 +1134,9 @@ static void scsi_16_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
* RETURNS:
* Zero on success, non-zero on error.
*/
static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, const u8 *cdb)
{
struct scsi_cmnd *scmd = qc->scsicmd;
struct ata_taskfile *tf = &qc->tf;
struct ata_device *dev = qc->dev;
u64 dev_sectors = qc->dev->n_sectors;
......@@ -1150,10 +1146,10 @@ static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, const u8 *sc
tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf->protocol = ATA_PROT_NODATA;
if (scsicmd[0] == VERIFY)
scsi_10_lba_len(scsicmd, &block, &n_block);
else if (scsicmd[0] == VERIFY_16)
scsi_16_lba_len(scsicmd, &block, &n_block);
if (cdb[0] == VERIFY)
scsi_10_lba_len(cdb, &block, &n_block);
else if (cdb[0] == VERIFY_16)
scsi_16_lba_len(cdb, &block, &n_block);
else
goto invalid_fld;
......@@ -1229,24 +1225,24 @@ static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, const u8 *sc
return 0;
invalid_fld:
ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
/* "Invalid field in cbd" */
return 1;
out_of_range:
ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
/* "Logical Block Address out of range" */
return 1;
nothing_to_do:
qc->scsicmd->result = SAM_STAT_GOOD;
scmd->result = SAM_STAT_GOOD;
return 1;
}
/**
* ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
* @qc: Storage for translated ATA taskfile
* @scsicmd: SCSI command to translate
* @cdb: SCSI command to translate
*
* Converts any of six SCSI read/write commands into the
* ATA counterpart, including starting sector (LBA),
......@@ -1262,29 +1258,28 @@ static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, const u8 *sc
* RETURNS:
* Zero on success, non-zero on error.
*/
static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *cdb)
{
struct scsi_cmnd *scmd = qc->scsicmd;
unsigned int tf_flags = 0;
u64 block;
u32 n_block;
int rc;
if (scsicmd[0] == WRITE_10 || scsicmd[0] == WRITE_6 ||
scsicmd[0] == WRITE_16)
if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
tf_flags |= ATA_TFLAG_WRITE;
/* Calculate the SCSI LBA, transfer length and FUA. */
switch (scsicmd[0]) {
switch (cdb[0]) {
case READ_10:
case WRITE_10:
scsi_10_lba_len(scsicmd, &block, &n_block);
if (unlikely(scsicmd[1] & (1 << 3)))
scsi_10_lba_len(cdb, &block, &n_block);
if (unlikely(cdb[1] & (1 << 3)))
tf_flags |= ATA_TFLAG_FUA;
break;
case READ_6:
case WRITE_6:
scsi_6_lba_len(scsicmd, &block, &n_block);
scsi_6_lba_len(cdb, &block, &n_block);
/* for 6-byte r/w commands, transfer length 0
* means 256 blocks of data, not 0 block.
......@@ -1294,8 +1289,8 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *scsicm
break;
case READ_16:
case WRITE_16:
scsi_16_lba_len(scsicmd, &block, &n_block);
if (unlikely(scsicmd[1] & (1 << 3)))
scsi_16_lba_len(cdb, &block, &n_block);
if (unlikely(cdb[1] & (1 << 3)))
tf_flags |= ATA_TFLAG_FUA;
break;
default:
......@@ -1326,17 +1321,17 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *scsicm
goto out_of_range;
/* treat all other errors as -EINVAL, fall through */
invalid_fld:
ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
/* "Invalid field in cbd" */
return 1;
out_of_range:
ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
/* "Logical Block Address out of range" */
return 1;
nothing_to_do:
qc->scsicmd->result = SAM_STAT_GOOD;
scmd->result = SAM_STAT_GOOD;
return 1;
}
......@@ -1456,7 +1451,7 @@ static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
ata_xlat_func_t xlat_func)
{
struct ata_queued_cmd *qc;
u8 *scsicmd = cmd->cmnd;
u8 *cdb = cmd->cmnd;
int is_io = xlat_func == ata_scsi_rw_xlat;
VPRINTK("ENTER\n");
......@@ -1488,7 +1483,7 @@ static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
qc->complete_fn = ata_scsi_qc_complete;
if (xlat_func(qc, scsicmd))
if (xlat_func(qc, cdb))
goto early_finish;
/* select device, send command to hardware */
......@@ -2344,7 +2339,7 @@ static void atapi_qc_complete(struct ata_queued_cmd *qc)
/**
* atapi_xlat - Initialize PACKET taskfile
* @qc: command structure to be initialized
* @scsicmd: SCSI CDB associated with this PACKET command
* @cdb: SCSI CDB associated with this PACKET command
*
* LOCKING:
* spin_lock_irqsave(host lock)
......@@ -2352,25 +2347,24 @@ static void atapi_qc_complete(struct ata_queued_cmd *qc)
* RETURNS:
* Zero on success, non-zero on failure.
*/
static unsigned int atapi_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
static unsigned int atapi_xlat(struct ata_queued_cmd *qc, const u8 *cdb)
{
struct scsi_cmnd *cmd = qc->scsicmd;
struct scsi_cmnd *scmd = qc->scsicmd;
struct ata_device *dev = qc->dev;
int using_pio = (dev->flags & ATA_DFLAG_PIO);
int nodata = (cmd->sc_data_direction == DMA_NONE);
int nodata = (scmd->sc_data_direction == DMA_NONE);
if (!using_pio)
/* Check whether ATAPI DMA is safe */
if (ata_check_atapi_dma(qc))
using_pio = 1;
memcpy(&qc->cdb, scsicmd, dev->cdb_len);
memcpy(&qc->cdb, cdb, dev->cdb_len);
qc->complete_fn = atapi_qc_complete;
qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
if (cmd->sc_data_direction == DMA_TO_DEVICE) {
if (scmd->sc_data_direction == DMA_TO_DEVICE) {
qc->tf.flags |= ATA_TFLAG_WRITE;
DPRINTK("direction: write\n");
}
......@@ -2392,12 +2386,12 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
qc->tf.protocol = ATA_PROT_ATAPI_DMA;
qc->tf.feature |= ATAPI_PKT_DMA;
if (atapi_dmadir && (cmd->sc_data_direction != DMA_TO_DEVICE))
if (atapi_dmadir && (scmd->sc_data_direction != DMA_TO_DEVICE))
/* some SATA bridges need us to indicate data xfer direction */
qc->tf.feature |= ATAPI_DMADIR;
}
qc->nbytes = cmd->request_bufflen;
qc->nbytes = scmd->request_bufflen;
return 0;
}
......@@ -2517,28 +2511,27 @@ ata_scsi_map_proto(u8 byte1)
/**
* ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
* @qc: command structure to be initialized
* @scsicmd: SCSI command to convert
* @cdb: SCSI command to convert
*
* Handles either 12 or 16-byte versions of the CDB.
*
* RETURNS:
* Zero on success, non-zero on failure.
*/
static unsigned int
ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *cdb)
{
struct ata_taskfile *tf = &(qc->tf);
struct scsi_cmnd *cmd = qc->scsicmd;
struct scsi_cmnd *scmd = qc->scsicmd;
struct ata_device *dev = qc->dev;
if ((tf->protocol = ata_scsi_map_proto(scsicmd[1])) == ATA_PROT_UNKNOWN)
if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
goto invalid_fld;
/* We may not issue DMA commands if no DMA mode is set */
if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
goto invalid_fld;
if (scsicmd[1] & 0xe0)
if (cdb[1] & 0xe0)
/* PIO multi not supported yet */
goto invalid_fld;
......@@ -2546,18 +2539,18 @@ ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
* 12 and 16 byte CDBs use different offsets to
* provide the various register values.
*/
if (scsicmd[0] == ATA_16) {
if (cdb[0] == ATA_16) {
/*
* 16-byte CDB - may contain extended commands.
*
* If that is the case, copy the upper byte register values.
*/
if (scsicmd[1] & 0x01) {
tf->hob_feature = scsicmd[3];
tf->hob_nsect = scsicmd[5];
tf->hob_lbal = scsicmd[7];
tf->hob_lbam = scsicmd[9];
tf->hob_lbah = scsicmd[11];
if (cdb[1] & 0x01) {
tf->hob_feature = cdb[3];
tf->hob_nsect = cdb[5];
tf->hob_lbal = cdb[7];
tf->hob_lbam = cdb[9];
tf->hob_lbah = cdb[11];
tf->flags |= ATA_TFLAG_LBA48;
} else
tf->flags &= ~ATA_TFLAG_LBA48;
......@@ -2565,26 +2558,26 @@ ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
/*
* Always copy low byte, device and command registers.
*/
tf->feature = scsicmd[4];
tf->nsect = scsicmd[6];
tf->lbal = scsicmd[8];
tf->lbam = scsicmd[10];
tf->lbah = scsicmd[12];
tf->device = scsicmd[13];
tf->command = scsicmd[14];
tf->feature = cdb[4];
tf->nsect = cdb[6];
tf->lbal = cdb[8];
tf->lbam = cdb[10];
tf->lbah = cdb[12];
tf->device = cdb[13];
tf->command = cdb[14];
} else {
/*
* 12-byte CDB - incapable of extended commands.
*/
tf->flags &= ~ATA_TFLAG_LBA48;
tf->feature = scsicmd[3];
tf->nsect = scsicmd[4];
tf->lbal = scsicmd[5];
tf->lbam = scsicmd[6];
tf->lbah = scsicmd[7];
tf->device = scsicmd[8];
tf->command = scsicmd[9];
tf->feature = cdb[3];
tf->nsect = cdb[4];
tf->lbal = cdb[5];
tf->lbam = cdb[6];
tf->lbah = cdb[7];
tf->device = cdb[8];
tf->command = cdb[9];
}
/*
* If slave is possible, enforce correct master/slave bit
......@@ -2611,7 +2604,7 @@ ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
*/
tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
if (cmd->sc_data_direction == DMA_TO_DEVICE)
if (scmd->sc_data_direction == DMA_TO_DEVICE)
tf->flags |= ATA_TFLAG_WRITE;
/*
......@@ -2620,7 +2613,7 @@ ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
* TODO: find out if we need to do more here to
* cover scatter/gather case.
*/
qc->nsect = cmd->request_bufflen / ATA_SECT_SIZE;
qc->nsect = scmd->request_bufflen / ATA_SECT_SIZE;
/* request result TF */
qc->flags |= ATA_QCFLAG_RESULT_TF;
......@@ -2628,7 +2621,7 @@ ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
return 0;
invalid_fld:
ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x00);
ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
/* "Invalid field in cdb" */
return 1;
}
......@@ -2701,7 +2694,7 @@ static inline void ata_scsi_dump_cdb(struct ata_port *ap,
#endif
}
static inline int __ata_scsi_queuecmd(struct scsi_cmnd *cmd,
static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
void (*done)(struct scsi_cmnd *),
struct ata_device *dev)
{
......@@ -2709,14 +2702,14 @@ static inline int __ata_scsi_queuecmd(struct scsi_cmnd *cmd,
if (dev->class == ATA_DEV_ATA) {
ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
cmd->cmnd[0]);
scmd->cmnd[0]);
if (xlat_func)
rc = ata_scsi_translate(dev, cmd, done, xlat_func);
rc = ata_scsi_translate(dev, scmd, done, xlat_func);
else
ata_scsi_simulate(dev, cmd, done);
ata_scsi_simulate(dev, scmd, done);
} else
rc = ata_scsi_translate(dev, cmd, done, atapi_xlat);
rc = ata_scsi_translate(dev, scmd, done, atapi_xlat);
return rc;
}
......
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