From be670d8a5b698a7a4edb2e69294b19e610eee95b Mon Sep 17 00:00:00 2001
From: Hirokazu Honda <hiroh@chromium.org>
Date: Wed, 10 Dec 2025 18:09:49 -0800
Subject: [PATCH] Fill v4l2_buffer.length for multi-planar API in qbuf

---
 lib/src/ioctl/qbuf.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/src/ioctl/qbuf.rs b/lib/src/ioctl/qbuf.rs
index b9150fd..4ead0f0 100644
--- a/lib/src/ioctl/qbuf.rs
+++ b/lib/src/ioctl/qbuf.rs
@@ -135,6 +135,7 @@ impl<H: PlaneHandle> From<QBuffer<H>> for UncheckedV4l2Buffer {
             v4l2_buf.0.__bindgen_anon_1.request_fd = *request;
         }
         if let Some(planes) = &mut v4l2_buf.1 {
+            v4l2_buf.0.length = qbuf.planes.len() as u32;
             for (dst_plane, src_plane) in planes.iter_mut().zip(qbuf.planes.into_iter()) {
                 *dst_plane = src_plane.0;
             }