netdev - Re: [RESEND][PATCH] Bluetooth: Make request workqueue freezable

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Date:	Thu, 21 May 2015 17:04:13 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Laura Abbott <labbott@...hat.com>,
	Oliver Neukum <oneukum@...e.com>,
	Ming Lei <ming.lei@...onical.com>,
	"David S. Miller" <davem@...emloft.net>,
	Laura Abbott <labbott@...oraproject.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Gustavo F. Padovan" <gustavo@...ovan.org>,
	"bluez mailin list (linux-bluetooth@...r.kernel.org)" 
	<linux-bluetooth@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [RESEND][PATCH] Bluetooth: Make request workqueue freezable

At Thu, 21 May 2015 10:18:08 -0400 (EDT),
Alan Stern wrote:
> 
> On Thu, 21 May 2015, Takashi Iwai wrote:
> 
> > Then avoiding the failed firmware is no solution, indeed.
> > If it's a new probe, it should be never executed during resume.
> 
> Can you expand this comment?  What's wrong with probing during resume?

Well, if the probe requires the access to a user-space file, it can't
be done during resume.  That's the very problem we're seeing now.
The firmware loader can't help much alone if it's a new device
object.

> The USB stack does carry out probes during resume under certain
> circumstances.  A driver lacking a reset_resume callback is one of
> those circumstances.

So, having a proper reset_resume in btusb would help in the end?


Takashi
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