linux-kernel - Re: loading firmware while usermodehelper disabled.

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Message-ID: <CA+55aFyee3DtBTRpxbiZSx2fCk4xYVOFQ3BeAybR8uynYp0AYA@mail.gmail.com>
Date:	Tue, 3 Jan 2012 08:29:07 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Jack Stone <jwjstone@...tmail.fm>,
	Oliver Neukum <oliver@...kum.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Larry Finger <Larry.Finger@...inger.net>,
	Chaoming Li <chaoming_li@...lsil.com.cn>,
	"John W. Linville" <linville@...driver.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	USB list <linux-usb@...r.kernel.org>,
	Linux Wireless List <linux-wireless@...r.kernel.org>
Subject: Re: loading firmware while usermodehelper disabled.

On Tue, Jan 3, 2012 at 4:24 AM, Matthew Garrett <mjg@...hat.com> wrote:
>
> The IDs will have changed due to the firmware falling out.

The thing is, I don't think it has.

You said this used to work. And I suspect that the ID's haven't
changed at all. The unbind/rebind kind of supports that (it shouldn't
re-bind if it's not the same device, afaik). I suspect the bug report
is from a system that didn't actually have the firmware loaded even
before the suspend (so no USB ID changes, just the stupid
unbind/rebind).

Of course, it's possible that it "used to work" just because we used
to have that "we'll try to load things even if user space isn't
ready", which caused 30-second timeouts for the random cases where it
didn't work, but also silently "just worked" for the other random
cases where it did happen to work. But I don't think unbind/rebind is
correct for an ID change, so that really doesn't make sense as a
explanation either (at least for *this* particular bug report).

                         Linus
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