linux-kernel - Re: [PATCH] firmware loader: don't cancel _nowait requests when helper is not yet available

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Date:	Thu, 15 Mar 2012 00:19:22 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Saravana Kannan <skannan@...eaurora.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Christian Lamparter <chunkeey@...glemail.com>,
	linux-kernel@...r.kernel.org,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	alan@...rguk.ukuu.org.uk,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH] firmware loader: don't cancel _nowait requests when helper is not yet available

On Thursday, March 15, 2012, Rafael J. Wysocki wrote:
> On Wednesday, March 14, 2012, Stephen Boyd wrote:
> > On 03/13/12 13:14, Rafael J. Wysocki wrote:
> > > All of those use cases are in fact of the "wait for user space to be thawed
> > > and then load the firmware" type, which I believe may be handled without
> > > changing that code.
> > >
> > > Why don't you make your kthread freezable, for one example?
> > >
> > > Why don't you use a freezable workqueue instead?
> > >
> > 
> > If we put it on the freezable workqueue or make it a freezable thread
> > will it work?
> 
> That depends on what exactly you want to achieve, which isn't entirely clear
> to me at this point.
> 
> > In my scenario a wakeup interrupt comes in that wakes us up from
> > suspend. Within that wakeup handler a work item is scheduled to the
> > freezable workqueue. That work item then calls request_firmware().
> 
> That should work.

I would consider using suspend/resume notifiers, however.

Thanks,
Rafael
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