linux-kernel - Re: [PATCH v3 2/2] [media] uvcvideo: Remain runtime-suspended at sleeps

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 20 Apr 2015 09:11:36 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-media@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] [media] uvcvideo: Remain runtime-suspended at sleeps

On 17 April 2015 at 19:32, Alan Stern <stern@...land.harvard.edu> wrote:
> On Fri, 17 Apr 2015, Tomeu Vizoso wrote:
>
>> When the system goes to sleep and afterwards resumes, a significant
>> amount of time is spent suspending and resuming devices that were
>> already runtime-suspended.
>>
>> By setting the power.force_direct_complete flag, the PM core will ignore
>> the state of descendant devices and the device will be let in
>> runtime-suspend.
>>
>> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
>> ---
>>  drivers/media/usb/uvc/uvc_driver.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
>> index 5970dd6..ae75a70 100644
>> --- a/drivers/media/usb/uvc/uvc_driver.c
>> +++ b/drivers/media/usb/uvc/uvc_driver.c
>> @@ -1945,6 +1945,8 @@ static int uvc_probe(struct usb_interface *intf,
>>                       "supported.\n", ret);
>>       }
>>
>> +     intf->dev.parent->power.force_direct_complete = true;
>
> This seems wrong.  The uvc driver is bound to intf, not to intf's
> parent.  So it would be okay for the driver to set
> intf->dev.power.force_direct_complete, but it's wrong to set
> intf->dev.parent->power.force_direct_complete.

Agreed.

Thanks,

Tomeu

> Alan Stern
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/