linux-kernel - Re: [PATCH v2] ath5k: disable ASPM

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Message-ID: <20100619123841.GA31838@hash.localnet>
Date:	Sat, 19 Jun 2010 08:38:41 -0400
From:	Bob Copeland <me@...copeland.com>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	Jussi Kivilinna <jussi.kivilinna@...et.fi>,
	ath5k-devel@...ts.ath5k.org, linux-wireless@...r.kernel.org,
	"Luis R. Rodriguez" <mcgrof@...badil.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ath5k: disable ASPM

On Sat, Jun 19, 2010 at 10:49:34AM +0300, Maxim Levitsky wrote:
> How this patch?

Looks fine to me.  Some nitpicking below but feel free to add my

Acked-by: Bob Copeland <me@...copeland.com>

to this or a later version.

>     Signed-off-by: Jussi Kivilinna <jussi.kivilinna@...et.fi>
>     Signed-off-by: Maxim Levitsky <maximlevitsky@...il.com>

I believe maintaining the s-o-b is usually reserved for the case when the
patch only has minor edits; here your patch while same in spirit has
some 30 fewer lines.  Maybe should use "From:" or mention Jussi in the
commit log to maintain attribution instead?

> +	/* Disable PCIE ASPM L0S. It is never enabled by windows driver */
> +	pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S);
> +

Would be good to expand this comment as to why (just copy another
sentence from the commit log or so).

>  	ret = pci_enable_device(pdev);
>  	if (ret) {
>  		dev_err(&pdev->dev, "can't enable device\n");
> @@ -722,6 +726,8 @@ static int ath5k_pci_resume(struct device *dev)
>  	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
>  	struct ath5k_softc *sc = hw->priv;
>  
> +	pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S);
> +

Did you test that it did get lost over suspend/resume?  A glance at
pci_save_pcie_state seems to indicate it's saved.

-- 
Bob Copeland %% www.bobcopeland.com

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