From 6948ec44c7f77fbd34283bfef7a661bd0d3c991d Mon Sep 17 00:00:00 2001 From: Jacopo Mondi Date: Wed, 26 Jun 2019 12:05:02 +0200 Subject: libcamera: v4l2_device: Fix control enumeration bug When enumerating the available V4L2 controls at video device open time set the V4L2_CTRL_FLAG_NEXT_CTRL flag if an unsupported control type is encountered to prevent infinite loops. While at it, downgrade the message reporting the unsupported control type to Debug, as it is not an error worth being reported unconditionally. Fixes: 030ce6491ed3 ("libcamera: v4l2_device: List valid controls at open") Signed-off-by: Jacopo Mondi Reviewed-by: Kieran Bingham Signed-off-by: Laurent Pinchart Reviewed-by: Laurent Pinchart --- src/libcamera/v4l2_device.cpp | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'src') diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp index 84758a81..f1821a7b 100644 --- a/src/libcamera/v4l2_device.cpp +++ b/src/libcamera/v4l2_device.cpp @@ -321,13 +321,14 @@ void V4L2Device::listControls() struct v4l2_query_ext_ctrl ctrl = {}; /* \todo Add support for menu and compound controls. */ - ctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL; - while (ioctl(VIDIOC_QUERY_EXT_CTRL, &ctrl) == 0) { + while (1) { + ctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL; + if (ioctl(VIDIOC_QUERY_EXT_CTRL, &ctrl)) + break; + if (ctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS || - ctrl.flags & V4L2_CTRL_FLAG_DISABLED) { - ctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL; + ctrl.flags & V4L2_CTRL_FLAG_DISABLED) continue; - } V4L2ControlInfo info(ctrl); switch (info.type()) { @@ -341,13 +342,12 @@ void V4L2Device::listControls() break; /* \todo Support compound controls. */ default: - LOG(V4L2, Error) << "Control type '" << info.type() + LOG(V4L2, Debug) << "Control type '" << info.type() << "' not supported"; continue; } controls_.emplace(ctrl.id, info); - ctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL; } } -- cgit v1.2.1