[SCSI] Prevent scsi_execute_async from guessing cdb length

When the scsi_execute_async interface was added it ended up reducing
the flexibility of userspace to send arbitrary scsi commands through
sg using SG_IO. The SG_IO interface allows userspace to specify the
CDB length. This is now ignored in scsi_execute_async and it is
guessed using the COMMAND_SIZE macro, which is not always correct,
particularly for vendor specific commands. This patch adds a cmd_len
parameter to the scsi_execute_async interface to allow the caller
to specify the length of the CDB.

Signed-off-by: Brian King <brking@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 13b1d3aac265..7f96f33c1bb1 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -508,7 +508,7 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd
         STp->buffer->cmdstat.have_sense = 0;
         STp->buffer->syscall_result = 0;
 
-        if (scsi_execute_async(STp->device, cmd, direction,
+        if (scsi_execute_async(STp->device, cmd, COMMAND_SIZE(cmd[0]), direction,
                         &((STp->buffer)->sg[0]), bytes, (STp->buffer)->sg_segs,
                                timeout, retries, SRpnt, st_sleep_done, GFP_KERNEL)) {
                 /* could not allocate the buffer or request was too large */