[PATCH] libcamera: v4l2_videodevice: Log buffer count on error

[Sven Püschel]

Log the actual and requested buffer count in the v4l2 error,
when not the requested buffer count could was allocated by V4L2.

Signed-off-by: Sven Püschel <s.pueschel at pengutronix.de>
Reviewed-by: Barnabás Pőcze <barnabas.pocze at ideasonboard.com>

---

Extracted from a [1], as it is independent of it.

[1] https://lists.libcamera.org/pipermail/libcamera-devel/2025-April/050024.html
---
 src/libcamera/v4l2_videodevice.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp
index f5b3fa09..d6f8c3cd 100644
--- a/src/libcamera/v4l2_videodevice.cpp
+++ b/src/libcamera/v4l2_videodevice.cpp
@@ -1326,7 +1326,8 @@ int V4L2VideoDevice::requestBuffers(unsigned int count,
 
 	if (rb.count < count) {
 		LOG(V4L2, Error)
-			<< "Not enough buffers provided by V4L2VideoDevice";
+			<< "Not enough buffers provided by V4L2VideoDevice. Wanted: "
+			<< count << ", got: " << rb.count;
 		requestBuffers(0, memoryType);
 		return -ENOMEM;
 	}
-- 
2.49.0