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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
scsi_execute().

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: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
FUJITA Tomonori 2008-12-05 15:25:21 +09:00 committed by James Bottomley
parent 4deba245d0
commit ffb4349499
1 changed files with 22 additions and 0 deletions
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22
drivers/scsi/st.c
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@ -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