io_uring/zcrx: assert area type in io_zcrx_iov_page

Add a simple debug assertion to io_zcrx_iov_page() making it's not
trying to return pages for a dmabuf area.

Signed-off-by: Pavel Begunkov <[email protected]>
Link: https://lore.kernel.org/r/c3c30a926a18436a399a1768f3cc86c76cd17fa7.1751466461.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <[email protected]>

Author: isilence

io_uring/zcrx.c

@@ -44,6 +44,8 @@ static inline struct page *io_zcrx_iov_page(const struct net_iov *niov)
 {
 	struct io_zcrx_area *area = io_zcrx_iov_to_area(niov);
 
+	lockdep_assert(!area->mem.is_dmabuf);
+
 	return area->mem.pages[net_iov_idx(niov)];
 }