linux-kernel - Re: [PATCH] sky2: avoid pci write posting after disabling irqs

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Message-ID: <20141130095420.53375231@urahara>
Date:	Sun, 30 Nov 2014 09:54:20 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Lino Sanfilippo <LinoSanfilippo@....de>
Cc:	mlindner@...vell.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sky2: avoid pci write posting after disabling irqs

On Sun, 30 Nov 2014 12:56:51 +0100
Lino Sanfilippo <LinoSanfilippo@....de> wrote:

> In sky2_change_mtu setting B0_IMSK to 0 may be delayed due to PCI write posting
> which could result in irqs being still active when synchronize_irq is called.
> Since we are not prepared to handle any further irqs after synchronize_irq
> (our resources are freed after that) force the write by a consecutive read from
> the same register.
> Similar situation in sky2_all_down: Here we disabled irqs by a write to B0_IMSK
> but did not ensure that this write took place before synchronize_irq. Fix that
> too.
> 
> Signed-off-by: Lino Sanfilippo <LinoSanfilippo@....de>

Looks correct.

Acked-by: Stephen Hemminger <stephen@...workplumber.org>

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