From: Ricardo Ribalda <ribalda@chromium.org>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
linux-media@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Ricardo Ribalda <ribalda@chromium.org>,
Hans Verkuil <hverkuil@xs4all.nl>
Subject: [PATCH v4 10/11] media: uvcvideo: Return -EACCES to inactive controls
Date: Mon, 15 Mar 2021 18:36:08 +0100 [thread overview]
Message-ID: <20210315173609.1547857-11-ribalda@chromium.org> (raw)
In-Reply-To: <20210315173609.1547857-1-ribalda@chromium.org>
If a control is inactive return -EACCES to let the userspace know that
the value will not be applied automatically when the control is active
again.
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Suggested-by: Hans Verkuil <hverkuil@xs4all.nl>
---
drivers/media/usb/uvc/uvc_ctrl.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index be0fadaf414c..f1593dc2f1ef 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1580,6 +1580,18 @@ int uvc_ctrl_begin(struct uvc_video_chain *chain)
return mutex_lock_interruptible(&chain->ctrl_mutex) ? -ERESTARTSYS : 0;
}
+static bool uvc_ctrl_is_inactive(struct uvc_control *ctrl)
+{
+ struct uvc_control_mapping *map;
+
+ list_for_each_entry(map, &ctrl->info.mappings, list) {
+ if (map->master_id)
+ return true;
+ }
+
+ return false;
+}
+
static int uvc_ctrl_commit_entity(struct uvc_device *dev,
struct uvc_entity *entity, int rollback)
{
@@ -1623,8 +1635,11 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev,
ctrl->dirty = 0;
- if (ret < 0)
+ if (ret < 0) {
+ if (uvc_ctrl_is_inactive(ctrl))
+ return -EACCES;
return ret;
+ }
}
return 0;
--
2.31.0.rc2.261.g7f71774620-goog
next prev parent reply other threads:[~2021-03-15 17:37 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-15 17:35 [PATCH v4 00/11] uvcvideo: Fix v4l2-compliance errors Ricardo Ribalda
2021-03-15 17:35 ` [PATCH v4 01/11] media: v4l2-ioctl: Fix check_ext_ctrls Ricardo Ribalda
2021-03-15 17:36 ` [PATCH v4 02/11] media: uvcvideo: Set capability in s_param Ricardo Ribalda
2021-03-15 17:36 ` [PATCH v4 03/11] media: uvcvideo: Return -EIO for control errors Ricardo Ribalda
2021-03-15 17:36 ` [PATCH v4 04/11] media: uvcvideo: set error_idx to count on EACCESS Ricardo Ribalda
2021-03-16 11:20 ` Hans Verkuil
2021-03-15 17:36 ` [PATCH v4 05/11] media: uvcvideo: refactor __uvc_ctrl_add_mapping Ricardo Ribalda
2021-03-15 17:36 ` [PATCH v4 06/11] media: uvcvideo: Add support for V4L2_CTRL_TYPE_CTRL_CLASS Ricardo Ribalda
2021-03-16 8:37 ` Hans Verkuil
2021-03-16 10:08 ` Laurent Pinchart
2021-03-16 10:12 ` Ricardo Ribalda
2021-03-16 11:04 ` Laurent Pinchart
2021-03-15 17:36 ` [PATCH v4 07/11] media: uvcvideo: Use dev->name for querycap() Ricardo Ribalda
2021-03-15 17:36 ` [PATCH v4 08/11] media: uvcvideo: Set unique vdev name based in type Ricardo Ribalda
2021-03-16 10:10 ` Hans Verkuil
2021-03-15 17:36 ` [PATCH v4 09/11] media: uvcvideo: Increase the size of UVC_METADATA_BUF_SIZE Ricardo Ribalda
2021-03-16 9:45 ` Hans Verkuil
2021-03-15 17:36 ` Ricardo Ribalda [this message]
2021-03-15 17:36 ` [PATCH v4 11/11] uvc: use vb2 ioctl and fop helpers Ricardo Ribalda
2021-03-16 11:29 ` Hans Verkuil
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