linux-kernel - Re: [PATCH 1/2] ahci: Ensure "MSI Revert to Single Message" mode is not enforced

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Message-ID: <20140416200132.GG22569@htj.dyndns.org>
Date:	Wed, 16 Apr 2014 16:01:32 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH 1/2] ahci: Ensure "MSI Revert to Single Message" mode is
 not enforced

Hello, Alexander.

On Wed, Apr 02, 2014 at 10:19:56AM +0200, Alexander Gordeev wrote:
> +static int ahci_is_mrsm(struct ahci_host_priv *hpriv)
> +{
> +	void __iomem *mmio = hpriv->mmio;
> +	u32 ctl = readl(mmio + HOST_CTL);
> +
> +	return ctl & HOST_MRSM;
> +}

Can you please just open code this in ahci_init_interrupt()?  Also, do
I need to backport this through -stable?  Has this been tested
somehow?  What are the impacts of missing this?

Thanks.

-- 
tejun
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