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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-12-05 15:25:21 +0900
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-12-29 11:24:29 -0600
commitffb4349499c00cd8ec90cb896599789cc00a7415 (patch)
tree95905f11c7463740d9905256d3c04c837ebb6701 /drivers/scsi/st.c
parent4deba245d0d6b2dc97cc4277c37f8519655d3afe (diff)
[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.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 203f22e816c..11341b717bb 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