linux-kernel - Re: [PATCH v2 2/2] media: uvcvideo: Do not alloc dev->status

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Message-ID: <CANiDSCs4onzD-OBYubJpGfyfPGcpMEPfPT8OKd_Q3UtNN1XciA@mail.gmail.com>
Date:   Wed, 14 Dec 2022 06:57:56 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Max Staudt <mstaudt@...gle.com>, Yunke Cao <yunkec@...omium.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] media: uvcvideo: Do not alloc dev->status

Hi Sergey

Thanks for the review

On Wed, 14 Dec 2022 at 01:40, Sergey Senozhatsky
<senozhatsky@...omium.org> wrote:
>
> On (22/12/13 15:35), Ricardo Ribalda wrote:
> [..]
> > +++ b/drivers/media/usb/uvc/uvcvideo.h
> > @@ -559,7 +559,7 @@ struct uvc_device {
> >       /* Status Interrupt Endpoint */
> >       struct usb_host_endpoint *int_ep;
> >       struct urb *int_urb;
> > -     u8 *status;
> > +     u8 status[UVC_MAX_STATUS_SIZE];
>
> Can we use `struct uvc_control_status status;` instead of open-coding it?
> Seems that this is what the code wants anyway:

It can also be a `struct uvc_streaming_status`

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/media/usb/uvc/uvc_status.c#n230

so we always need the casting :(

>
>         struct uvc_control_status *status =
>                                 (struct uvc_control_status *)dev->status;
>
> And then we can drop casts in uvc_status_complete().



-- 
Ricardo Ribalda