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Revert "media: v4l2-ctrls: show all owned controls in log_status"
This reverts commit9801b5b28c
. 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>
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@ -2507,8 +2507,7 @@ int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
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EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
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/* Log the control name and value */
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static void log_ctrl(const struct v4l2_ctrl_handler *hdl,
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struct v4l2_ctrl *ctrl,
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static void log_ctrl(const struct v4l2_ctrl *ctrl,
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const char *prefix, const char *colon)
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{
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if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
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@ -2518,11 +2517,7 @@ static void log_ctrl(const struct v4l2_ctrl_handler *hdl,
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pr_info("%s%s%s: ", prefix, colon, ctrl->name);
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if (ctrl->handler != hdl)
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v4l2_ctrl_lock(ctrl);
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ctrl->type_ops->log(ctrl);
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if (ctrl->handler != hdl)
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v4l2_ctrl_unlock(ctrl);
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if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
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V4L2_CTRL_FLAG_GRABBED |
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@ -2541,7 +2536,7 @@ static void log_ctrl(const struct v4l2_ctrl_handler *hdl,
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void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
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const char *prefix)
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{
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struct v4l2_ctrl_ref *ref;
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struct v4l2_ctrl *ctrl;
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const char *colon = "";
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int len;
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@ -2553,12 +2548,9 @@ void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
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if (len && prefix[len - 1] != ' ')
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colon = ": ";
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mutex_lock(hdl->lock);
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list_for_each_entry(ref, &hdl->ctrl_refs, node) {
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if (ref->from_other_dev ||
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(ref->ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
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continue;
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log_ctrl(hdl, ref->ctrl, prefix, colon);
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}
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list_for_each_entry(ctrl, &hdl->ctrls, node)
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if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
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log_ctrl(ctrl, prefix, colon);
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mutex_unlock(hdl->lock);
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}
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EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
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