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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-12-05 15:25:21 +0900 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-12-29 11:24:29 -0600 |
| commit | ffb4349499c00cd8ec90cb896599789cc00a7415 (patch) | |
| tree | 95905f11c7463740d9905256d3c04c837ebb6701 /drivers/scsi/st.c | |
| parent | 4deba245d0d6b2dc97cc4277c37f8519655d3afe (diff) | |
| download | linux-ffb4349499c00cd8ec90cb896599789cc00a7415.tar.gz linux-ffb4349499c00cd8ec90cb896599789cc00a7415.tar.bz2 linux-ffb4349499c00cd8ec90cb896599789cc00a7415.zip | |
[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>
Diffstat (limited to 'drivers/scsi/st.c')
| -rw-r--r-- | drivers/scsi/st.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 203f22e816c0..11341b717bba 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -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 |