diff options
| -rw-r--r-- | sys/dev/xen/blkfront/blkfront.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/sys/dev/xen/blkfront/blkfront.c b/sys/dev/xen/blkfront/blkfront.c index a71251d..eeb4fee 100644 --- a/sys/dev/xen/blkfront/blkfront.c +++ b/sys/dev/xen/blkfront/blkfront.c @@ -168,7 +168,6 @@ xbd_queue_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error) uint64_t fsect, lsect; int ref; int op; - int block_segs; cm = arg; sc = cm->cm_sc; @@ -180,6 +179,9 @@ xbd_queue_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error) return; } + KASSERT(nsegs <= BLKIF_MAX_SEGMENTS_PER_REQUEST, + ("Too many segments in a blkfront I/O")); + /* Fill out a communications ring structure. */ ring_req = RING_GET_REQUEST(&sc->xbd_ring, sc->xbd_ring.req_prod_pvt); sc->xbd_ring.req_prod_pvt++; @@ -190,9 +192,8 @@ xbd_queue_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error) ring_req->nr_segments = nsegs; cm->cm_nseg = nsegs; - block_segs = MIN(nsegs, BLKIF_MAX_SEGMENTS_PER_REQUEST); sg = ring_req->seg; - last_block_sg = sg + block_segs; + last_block_sg = sg + nsegs; sg_ref = cm->cm_sg_refs; while (sg < last_block_sg) { @@ -227,7 +228,6 @@ xbd_queue_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error) sg++; sg_ref++; segs++; - nsegs--; } if (cm->cm_operation == BLKIF_OP_READ) |
