kgdb: fix optional arch functions and probe_kernel_*

[linux-2.6-omap-h63xx.git] / block / blk-merge.c

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 39f2e077a01469fe3f9c04443b285777964224b5..0f58616bcd7f183514c43eb913f0e0c23c855215 100644 (file)
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -220,7 +220,10 @@ new_segment:
                bvprv = bvec;
        } /* segments in rq */
 
-       if (q->dma_drain_size) {
+       if (q->dma_drain_size && q->dma_drain_needed(rq)) {
+               if (rq->cmd_flags & REQ_RW)
+                       memset(q->dma_drain_buffer, 0, q->dma_drain_size);
+
                sg->page_link &= ~0x02;
                sg = sg_next(sg);
                sg_set_page(sg, virt_to_page(q->dma_drain_buffer),
@@ -228,7 +231,7 @@ new_segment:
                            ((unsigned long)q->dma_drain_buffer) &
                            (PAGE_SIZE - 1));
                nsegs++;
-               rq->data_len += q->dma_drain_size;
+               rq->extra_len += q->dma_drain_size;
        }
 
        if (sg)