linux-kernel - Re: [PATCH] PCI: Fix regression in pci_restore

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Message-ID: <CA+55aFyShMvUjkyGv4DgSGByuoU18o8=MnGJqbz5aSwDVyOyOA@mail.gmail.com>
Date:	Sun, 15 Apr 2012 11:59:19 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mikko Vinni <mmvinni@...oo.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Allen Kay <allen.m.kay@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] PCI: Fix regression in pci_restore_state()

On Sun, Apr 15, 2012 at 11:47 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>
> mdelay(10) doesn't really look good either to me in this case, though.

Oh, I agree. What kind of ass-backwards device actually needs that
kind of crazy delays? It is almost certainly buggy.

With retries, 10ms delays are totally unacceptable. There's something wrong.

A single ms *may* be ok.

Anyway, can you also split the actual "write _one_ register with
retry" into a function of its own? The code looks like crap with those
multiple levels of looping, with conditionals inside them etc. With a
simple helper function, you could change the break into return, and it
would look much better, I bet.

                    Linus
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