tree a1dc19e6ec49ade2bc1b5a8b592448d037e0b71a
parent 594d2a6fa18883dfd3bc26a6a600da53a09c3e86
author Andrew Scull <ascull@google.com> 1652697692 +0000
committer Tom Rini <trini@konsulko.com> 1654694643 -0400

virtio_ring: Check used descriptors are chain heads

When the device returns used buffers, it should refer to the descriptor
that is the head of the descriptor chain for that buffer. Confirm this
to be the case by tracking the head of descriptor chains that have been
made available to the device.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>