linux-kernel - Re: [PATCH v4 1/2] media: uvcvideo: Refactor streamon/streamoff

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Date:   Tue, 6 Dec 2022 11:12:46 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, Yunke Cao <yunkec@...omium.org>,
        Max Staudt <mstaudt@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] media: uvcvideo: Refactor streamon/streamoff

On (22/12/02 18:19), Ricardo Ribalda wrote:
> @@ -840,13 +840,19 @@ static int uvc_ioctl_streamon(struct file *file, void *fh,
[..]
> +	handle->is_streaming = !ret;


> @@ -857,15 +863,22 @@ static int uvc_ioctl_streamoff(struct file *file, void *fh,
[..]
> +	handle->is_streaming = !!ret;

Had uvc_ioctl_streamABC() be 3 functions we would have seen

	handle->is_streaming = !!!ret;

:)


[..]

A nit:

>  struct uvc_fh {
>  	struct v4l2_fh vfh;
> +	bool is_streaming;

That's a lot of padding.

>  	struct uvc_video_chain *chain;
>  	struct uvc_streaming *stream;
>  	enum uvc_handle_state state;

I guess is_streaming better be next to enum uvc_handle_state, in which
case is_streaming should not change sizeof(uvc_fh) (at least so on
64-bit).