linux-kernel - Re: [PATCH v3 2/3] media: uvcvideo: Do not halt the device after disconnect

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Message-ID: <20231122080132.GA1526356@google.com>
Date:   Wed, 22 Nov 2023 17:01:32 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Tomasz Figa <tfiga@...omium.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sean Paul <seanpaul@...omium.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCH v3 2/3] media: uvcvideo: Do not halt the device after
 disconnect

On (23/11/22 16:47), Sergey Senozhatsky wrote:
> Can the following happen?

Consider the following case (when CPU1 experienced a delay, a preemption
or anything):

> CPU0                                            CPU1
>  uvc_disconnect()
> 						uvc_video_stop_streaming()
>  usb_set_intfdata()
>  uvc_unregister_video()
> 
> 						if (!smp_load(&dev->disconnected))
> 
>  smp_store_release(&dev->disconnected, true);
> 
>  kref_put(&dev->ref, uvc_delete);

> 							uvc_video_halt()

That uvc_video_halt() cannot be legal, right?