2 files changed, 36 insertions, 2 deletions

diff --git a/block/bsg.c b/block/bsg.c
index 8e181ab3afb9..69b0a9d33306 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -445,6 +445,15 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
         else
                 hdr->dout_resid = rq->data_len;
 
+        /*
+         * If the request generated a negative error number, return it
+         * (providing we aren't already returning an error); if it's
+         * just a protocol response (i.e. non negative), that gets
+         * processed above.
+         */
+        if (!ret && rq->errors < 0)
+                ret = rq->errors;
+
         blk_rq_unmap_user(bio);
         blk_put_request(rq);
 
@@ -837,6 +846,7 @@ static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
         struct bsg_device *bd = file->private_data;
         int __user *uarg = (int __user *) arg;
+        int ret;
 
         switch (cmd) {
                 /*
@@ -889,12 +899,12 @@ static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                 if (rq->next_rq)
                         bidi_bio = rq->next_rq->bio;
                 blk_execute_rq(bd->queue, NULL, rq, 0);
-                blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio);
+                ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio);
 
                 if (copy_to_user(uarg, &hdr, sizeof(hdr)))
                         return -EFAULT;
 
-                return 0;
+                return ret;
         }
         /*
          * block device ioctls
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 5ccec8aa964b..3d0422f48453 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -760,6 +760,30 @@ void blk_queue_dma_alignment(struct request_queue *q, int mask)
 EXPORT_SYMBOL(blk_queue_dma_alignment);
 
 /**
+ * blk_queue_update_dma_alignment - update dma length and memory alignment
+ * @q:     the request queue for the device
+ * @mask:  alignment mask
+ *
+ * description:
+ *    update required memory and length aligment for direct dma transactions.
+ *    If the requested alignment is larger than the current alignment, then
+ *    the current queue alignment is updated to the new value, otherwise it
+ *    is left alone.  The design of this is to allow multiple objects
+ *    (driver, device, transport etc) to set their respective
+ *    alignments without having them interfere.
+ *
+ **/
+void blk_queue_update_dma_alignment(struct request_queue *q, int mask)
+{
+        BUG_ON(mask > PAGE_SIZE);
+
+        if (mask > q->dma_alignment)
+                q->dma_alignment = mask;
+}
+
+EXPORT_SYMBOL(blk_queue_update_dma_alignment);
+
+/**
  * blk_queue_find_tag - find a request by its tag and queue
  * @q:   The request queue for the device
  * @tag: The tag of the request