linux-kernel - Re: [PATCH -v3 1/4] pci, usb: Make usb handoff func all take base remapping

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Date:	Tue, 11 Jan 2011 16:21:30 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Greg KH <greg@...ah.com>, Jesse Barnes <jbarnes@...tuousgeek.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	linux-usb@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v3 1/4] pci, usb:  Make usb handoff func all take base
 remapping

On Mon, 2011-01-10 at 17:20 -0800, Yinghai Lu wrote:
> 
> for early access, can not use udelay yet, it will take some one.
> Also msleep will cause crash, because it needs scheduler there.

Right, and that's for such special cases (hopefully rare) that we have
system_state... Much better than your function pointers I reckon.

We could even wrap it into a safe_delay() function or whatever (in fact
why not make msleep() itself safe ? It's not like it was timing critical
code :-)

Cheers,
Ben.


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