rpmsg: fix published buffer length in rpmsg_recv_done

After processing an incoming message, always publish the real size
of its containing buffer when putting it back on the available rx ring.

Using any different value might erroneously limit the remote processor
(leading it to think the buffer is smaller than it really is).

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Grosen <mgrosen@ti.com>
Cc: Suman Anna <s-anna@ti.com>
Cc: Fernando Guzman Lugo <fernando.lugo@ti.com>
Cc: Rob Clark <rob@ti.com>
Cc: Ludovic BARRE <ludovic.barre@stericsson.com>
Cc: Loic PALLARDY <loic.pallardy@stericsson.com>
Cc: Omar Ramirez Luna <omar.luna@linaro.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 1e8b8b618674..f93ca3b8fd42 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -798,7 +798,8 @@ static void rpmsg_recv_done(struct virtqueue *rvq)
         else
                 dev_warn(dev, "msg received with no recepient\n");
 
-        sg_init_one(&sg, msg, sizeof(*msg) + len);
+        /* publish the real size of the buffer */
+        sg_init_one(&sg, msg, RPMSG_BUF_SIZE);
 
         /* add the buffer back to the remote processor's virtqueue */
         err = virtqueue_add_buf(vrp->rvq, &sg, 0, 1, msg, GFP_KERNEL);