[SCSI] use scatter lists for all block pc requests and simplify hw handlers

Original From: Mike Christie <michaelc@cs.wisc.edu>

Add scsi_execute_req() as a replacement for scsi_wait_req()

Fixed up various pieces (added REQ_SPECIAL and caught req use after
free)

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/scsi/scsi_request.h b/include/scsi/scsi_request.h
index 98719407d554..d64903a617c3 100644
--- a/include/scsi/scsi_request.h
+++ b/include/scsi/scsi_request.h
@@ -54,6 +54,9 @@ extern void scsi_do_req(struct scsi_request *, const void *cmnd,
                         void *buffer, unsigned bufflen,
                         void (*done) (struct scsi_cmnd *),
                         int timeout, int retries);
+extern int scsi_execute_req(struct scsi_device *sdev, unsigned char *cmd,
+                            int data_direction, void *buffer, unsigned bufflen,
+                            unsigned char *sense, int timeout, int retries);
 
 struct scsi_mode_data {
         __u32   length;