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Revert "media: v4l2-ctrls: show all owned controls in log_status"

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This reverts commit 9801b5b28c.

This patch introduced a potential deadlock scenario:

[Wed May  8 10:02:06 2024]  Possible unsafe locking scenario:

[Wed May  8 10:02:06 2024]        CPU0                    CPU1
[Wed May  8 10:02:06 2024]        ----                    ----
[Wed May  8 10:02:06 2024]   lock(vivid_ctrls:1620:(hdl_vid_cap)->_lock);
[Wed May  8 10:02:06 2024]                                lock(vivid_ctrls:1608:(hdl_user_vid)->_lock);
[Wed May  8 10:02:06 2024]                                lock(vivid_ctrls:1620:(hdl_vid_cap)->_lock);
[Wed May  8 10:02:06 2024]   lock(vivid_ctrls:1608:(hdl_user_vid)->_lock);

For now just revert.

Fixes: 9801b5b28c ("media: v4l2-ctrls: show all owned controls in log_status")
Cc: stable@vger.kernel.org
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Hans Verkuil 2024-05-10 09:11:46 +02:00
parent 6983352784
commit eba63df7eb
1 changed files with 5 additions and 13 deletions
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18
drivers/media/v4l2-core/v4l2-ctrls-core.c
View file

@ -2507,8 +2507,7 @@ int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
/* Log the control name and value */
static void log_ctrl(const struct v4l2_ctrl_handler *hdl,
struct v4l2_ctrl *ctrl,
static void log_ctrl(const struct v4l2_ctrl *ctrl,
const char *prefix, const char *colon)
{
if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
@ -2518,11 +2517,7 @@ static void log_ctrl(const struct v4l2_ctrl_handler *hdl,
pr_info("%s%s%s: ", prefix, colon, ctrl->name);
if (ctrl->handler != hdl)
v4l2_ctrl_lock(ctrl);
ctrl->type_ops->log(ctrl);
if (ctrl->handler != hdl)
v4l2_ctrl_unlock(ctrl);
if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
V4L2_CTRL_FLAG_GRABBED |
@ -2541,7 +2536,7 @@ static void log_ctrl(const struct v4l2_ctrl_handler *hdl,
void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
const char *prefix)
{
struct v4l2_ctrl_ref *ref;
struct v4l2_ctrl *ctrl;
const char *colon = "";
int len;
@ -2553,12 +2548,9 @@ void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
if (len && prefix[len - 1] != ' ')
colon = ": ";
mutex_lock(hdl->lock);
list_for_each_entry(ref, &hdl->ctrl_refs, node) {
if (ref->from_other_dev ||
(ref->ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
continue;
log_ctrl(hdl, ref->ctrl, prefix, colon);
}
list_for_each_entry(ctrl, &hdl->ctrls, node)
if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
log_ctrl(ctrl, prefix, colon);
mutex_unlock(hdl->lock);
}
EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);