Commit ffb43494 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by James Bottomley
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[SCSI] st: add st_scsi_kern_execute helper function

st_scsi_kern_execute is a helper function to perform SCSI commands
synchronously. It supports data transfer with a liner in-kernel buffer
(not scatter gather). st_scsi_kern_execute internally uses

The majority of st_do_scsi can be replaced with
st_scsi_kern_execute. This is a preparation for rewriting st_do_scsi
to remove obsolete scsi_execute_async().
Signed-off-by: default avatarFUJITA Tomonori <>
Signed-off-by: default avatarJames Bottomley <>
parent 4deba245
......@@ -533,6 +533,28 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd
return SRpnt;
static int st_scsi_kern_execute(struct st_request *streq,
const unsigned char *cmd, int data_direction,
void *buffer, unsigned bufflen, int timeout,
int retries)
struct scsi_tape *stp = streq->stp;
int ret, resid;
stp->buffer->cmdstat.have_sense = 0;
memcpy(streq->cmd, cmd, sizeof(streq->cmd));
ret = scsi_execute(stp->device, cmd, data_direction, buffer, bufflen,
streq->sense, timeout, retries, 0, &resid);
if (driver_byte(ret) & DRIVER_ERROR)
return -EBUSY;
stp->buffer->cmdstat.midlevel_result = streq->result = ret;
stp->buffer->cmdstat.residual = resid;
stp->buffer->syscall_result = st_chk_result(stp, streq);
return 0;
/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
write has been correct but EOM early warning reached, -EIO if write ended in
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