1 files changed, 83 insertions, 13 deletions

diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c
index 0ea78d9a37db..acb835837eec 100644
--- a/drivers/scsi/osst.c
+++ b/drivers/scsi/osst.c
@@ -280,8 +280,8 @@ static int osst_chk_result(struct osst_tape * STp, struct osst_request * SRpnt)
                         static  int     notyetprinted = 1;
 
                         printk(KERN_WARNING
-                             "%s:W: Warning %x (sugg. bt 0x%x, driver bt 0x%x, host bt 0x%x).\n",
-                             name, result, suggestion(result), driver_byte(result) & DRIVER_MASK,
+                             "%s:W: Warning %x (driver bt 0x%x, host bt 0x%x).\n",
+                             name, result, driver_byte(result),
                              host_byte(result));
                         if (notyetprinted) {
                                 notyetprinted = 0;
@@ -317,18 +317,25 @@ static int osst_chk_result(struct osst_tape * STp, struct osst_request * SRpnt)
 
 
 /* Wakeup from interrupt */
-static void osst_sleep_done(void *data, char *sense, int result, int resid)
+static void osst_end_async(struct request *req, int update)
 {
-        struct osst_request *SRpnt = data;
+        struct osst_request *SRpnt = req->end_io_data;
         struct osst_tape *STp = SRpnt->stp;
+        struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
 
-        memcpy(SRpnt->sense, sense, SCSI_SENSE_BUFFERSIZE);
-        STp->buffer->cmdstat.midlevel_result = SRpnt->result = result;
+        STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
 #if DEBUG
         STp->write_pending = 0;
 #endif
         if (SRpnt->waiting)
                 complete(SRpnt->waiting);
+
+        if (SRpnt->bio) {
+                kfree(mdata->pages);
+                blk_rq_unmap_user(SRpnt->bio);
+        }
+
+        __blk_put_request(req->q, req);
 }
 
 /* osst_request memory management */
@@ -342,6 +349,74 @@ static void osst_release_request(struct osst_request *streq)
         kfree(streq);
 }
 
+static int osst_execute(struct osst_request *SRpnt, const unsigned char *cmd,
+                        int cmd_len, int data_direction, void *buffer, unsigned bufflen,
+                        int use_sg, int timeout, int retries)
+{
+        struct request *req;
+        struct page **pages = NULL;
+        struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
+
+        int err = 0;
+        int write = (data_direction == DMA_TO_DEVICE);
+
+        req = blk_get_request(SRpnt->stp->device->request_queue, write, GFP_KERNEL);
+        if (!req)
+                return DRIVER_ERROR << 24;
+
+        req->cmd_type = REQ_TYPE_BLOCK_PC;
+        req->cmd_flags |= REQ_QUIET;
+
+        SRpnt->bio = NULL;
+
+        if (use_sg) {
+                struct scatterlist *sg, *sgl = (struct scatterlist *)buffer;
+                int i;
+
+                pages = kzalloc(use_sg * sizeof(struct page *), GFP_KERNEL);
+                if (!pages)
+                        goto free_req;
+
+                for_each_sg(sgl, sg, use_sg, i)
+                        pages[i] = sg_page(sg);
+
+                mdata->null_mapped = 1;
+
+                mdata->page_order = get_order(sgl[0].length);
+                mdata->nr_entries =
+                        DIV_ROUND_UP(bufflen, PAGE_SIZE << mdata->page_order);
+                mdata->offset = 0;
+
+                err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, GFP_KERNEL);
+                if (err) {
+                        kfree(pages);
+                        goto free_req;
+                }
+                SRpnt->bio = req->bio;
+                mdata->pages = pages;
+
+        } else if (bufflen) {
+                err = blk_rq_map_kern(req->q, req, buffer, bufflen, GFP_KERNEL);
+                if (err)
+                        goto free_req;
+        }
+
+        req->cmd_len = cmd_len;
+        memset(req->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
+        memcpy(req->cmd, cmd, req->cmd_len);
+        req->sense = SRpnt->sense;
+        req->sense_len = 0;
+        req->timeout = timeout;
+        req->retries = retries;
+        req->end_io_data = SRpnt;
+
+        blk_execute_rq_nowait(req->q, NULL, req, 1, osst_end_async);
+        return 0;
+free_req:
+        blk_put_request(req);
+        return DRIVER_ERROR << 24;
+}
+
 /* Do the scsi command. Waits until command performed if do_wait is true.
    Otherwise osst_write_behind_check() is used to check that the command
    has finished. */
@@ -403,8 +478,8 @@ static	struct osst_request * osst_do_scsi(struct osst_request *SRpnt, struct oss
         STp->buffer->cmdstat.have_sense = 0;
         STp->buffer->syscall_result = 0;
 
-        if (scsi_execute_async(STp->device, cmd, COMMAND_SIZE(cmd[0]), direction, bp, bytes,
-                        use_sg, timeout, retries, SRpnt, osst_sleep_done, GFP_KERNEL))
+        if (osst_execute(SRpnt, cmd, COMMAND_SIZE(cmd[0]), direction, bp, bytes,
+                         use_sg, timeout, retries))
                 /* could not allocate the buffer or request was too large */
                 (STp->buffer)->syscall_result = (-EBUSY);
         else if (do_wait) {
@@ -5286,11 +5361,6 @@ static int enlarge_buffer(struct osst_buffer *STbuffer, int need_dma)
                 struct page *page = alloc_pages(priority, (OS_FRAME_SIZE - got <= PAGE_SIZE) ? 0 : order);
                 STbuffer->sg[segs].offset = 0;
                 if (page == NULL) {
-                        if (OS_FRAME_SIZE - got <= (max_segs - segs) * b_size / 2 && order) {
-                                b_size /= 2;  /* Large enough for the rest of the buffers */
-                                order--;
-                                continue;
-                        }
                         printk(KERN_WARNING "osst :W: Failed to enlarge buffer to %d bytes.\n",
                                                 OS_FRAME_SIZE);
 #if DEBUG