From ffb4349499c00cd8ec90cb896599789cc00a7415 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Fri, 5 Dec 2008 15:25:21 +0900 Subject: [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 Signed-off-by: James Bottomley --- drivers/scsi/st.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'drivers/scsi/st.c') 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 -- cgit v1.2.1