lguest: Fix lguest virtio-blk backend size computation

This seems like an obvious typo but it's worked in the past because the virtio
blk frontend just ignores the length field on completion.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 4 insertions, 4 deletions

diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index f2668390e8f7..157f6a26b939 100644
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -1342,7 +1342,7 @@ static bool service_io(struct device *dev)
         if (out->type & VIRTIO_BLK_T_SCSI_CMD) {
                 fprintf(stderr, "Scsi commands unsupported\n");
                 in->status = VIRTIO_BLK_S_UNSUPP;
-                wlen = sizeof(in);
+                wlen = sizeof(*in);
         } else if (out->type & VIRTIO_BLK_T_OUT) {
                 /* Write */
 
@@ -1363,7 +1363,7 @@ static bool service_io(struct device *dev)
                         /* Die, bad Guest, die. */
                         errx(1, "Write past end %llu+%u", off, ret);
                 }
-                wlen = sizeof(in);
+                wlen = sizeof(*in);
                 in->status = (ret >= 0 ? VIRTIO_BLK_S_OK : VIRTIO_BLK_S_IOERR);
         } else {
                 /* Read */
@@ -1376,10 +1376,10 @@ static bool service_io(struct device *dev)
                 ret = readv(vblk->fd, iov+1, in_num-1);
                 verbose("READ from sector %llu: %i\n", out->sector, ret);
                 if (ret >= 0) {
-                        wlen = sizeof(in) + ret;
+                        wlen = sizeof(*in) + ret;
                         in->status = VIRTIO_BLK_S_OK;
                 } else {
-                        wlen = sizeof(in);
+                        wlen = sizeof(*in);
                         in->status = VIRTIO_BLK_S_IOERR;
                 }
         }