linux-kernel - Re: [patch 5/7] ps3: Disk Storage Driver

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Message-Id: <200705260045.09722.arnd@arndb.de>
Date:	Sat, 26 May 2007 00:45:09 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 5/7] ps3: Disk Storage Driver

On Friday 25 May 2007, Geert Uytterhoeven wrote:
> On Fri, 25 May 2007, Arnd Bergmann wrote:
>
> > Ok, but why does it call wait_for_completion() then?
> > I thought you could end_that_request_* from the interrupt handler instead.
> 
> Actually I tried that first, but I ran into other problems, like my request
> handler being called continuously and requests gotten stuck. But maybe it was
> just a locking bug on my side.
> 
> I can retry, but a disadvantage will be that there will be less code shared
> with ps3flash and ps3rom.

Not sure how much difference it will make performance-wise, but the context
switch for each bio adds some extra cost at least. Changing it
means you no longer share the ps3stor_read_write_sectors, but can at
the same time simplify the disk driver, so that won't hurt in total.

I don't care much, but I think it's worth trying.

	Arnd <><
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