On 2021/1/28 下午10:41, Stefano Garzarella wrote:
__vringh_iov() overwrites the contents of riov and wiov, in fact it resets the 'i' and 'used' fields, but also the consumed field should be reset to avoid an inconsistent state. Signed-off-by: Stefano Garzarella <sgarz...@redhat.com>
I had a question(I remember we had some discussion like this but I forget the conclusion):
I see e.g in vringh_getdesc_kern() it has the following comment: /* * Note that you may need to clean up riov and wiov, even on error! */ So it looks to me the correct way is to call vringh_kiov_cleanup() before? Thanks
--- drivers/vhost/vringh.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c index f68122705719..bee63d68201a 100644 --- a/drivers/vhost/vringh.c +++ b/drivers/vhost/vringh.c @@ -290,9 +290,9 @@ __vringh_iov(struct vringh *vrh, u16 i, return -EINVAL;if (riov)- riov->i = riov->used = 0; + riov->i = riov->used = riov->consumed = 0; if (wiov) - wiov->i = wiov->used = 0; + wiov->i = wiov->used = wiov->consumed = 0;for (;;) {void *addr;
