linux-kernel - Re: [PATCH #upstream-fixes] ahci: give another shot at clearing all bits in irq

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Message-ID: <4870CC94.8090504@garzik.org>
Date:	Sun, 06 Jul 2008 09:45:56 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH #upstream-fixes] ahci: give another shot at clearing all
 bits in irq_stat

Tejun Heo wrote:
> Commit ea0c62f7cf70f13a67830471b613337bd0c9a62e tried to clear all
> bits in irq_stat but it didn't actually achieve that as irq_stat was
> anded with port_map right after read.  This patch makes ahci driver
> always use the unmasked value to clear irq_status.
> 
> While at it, add explanation on the peculiarities of ahci IRQ
> clearing.
> 
> This was spotted by Linus Torvalds.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> ---
> The original report requires further investigation regarding why the
> bogus change fixed the problem but this change is the correct thing to
> do regardless.
> 
> Thanks.

Belated post-holiday ACK (since it's already in).

Thanks for taking care of this, and good catch too.

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