linux-kernel - Re: [PATCH 1/2] driver core: firmware loader: don't cache FW_ACTION

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Date:	Mon, 27 May 2013 22:31:24 +0530
From:	anish singh <anish198519851985@...il.com>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Takashi Iwai <tiwai@...e.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel-mail <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] driver core: firmware loader: don't cache
 FW_ACTION_NOHOTPLUG firmware

On Mon, May 27, 2013 at 6:52 PM, Ming Lei <ming.lei@...onical.com> wrote:
> On Mon, May 27, 2013 at 8:40 PM, anish singh
> <anish198519851985@...il.com> wrote:
>> On Mon, May 27, 2013 at 5:53 PM, Takashi Iwai <tiwai@...e.de> wrote:
>>> At Mon, 27 May 2013 17:26:22 +0530,
>>> anish singh wrote:
>>>>
>>>> On Mon, May 27, 2013 at 4:00 PM, Ming Lei <ming.lei@...onical.com> wrote:
>>>> > Generally there are only two drivers which don't need uevent to
>>>> > handle firmware loading, so don't cache these firmwares during
>> Sorry but it confuses me further,
>
> Please put one blank line before your reply, otherwise it is a bit
> difficult to find your reply in email.

sorry.

>
>> If driver doesn't have information about these firmware then how
>> does it cache it?
>
> Driver only needs firmware's name for caching it, but driver can choose
> if it generates uevent to let userspace handle it. Without one uevent, the
> user space still can handle the request by waiting for the firmware sysfs
> device in advance. But if there is no one user space to handle the request,
> the request in kernel won't be completed and there is no timeout for this
> case, so will block suspend.

Now makes sense.Thanks!!
>
>
> Thanks,
> --
> Ming Lei
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