linux-kernel - Re: [RESEND PATCH 3/3] net: stmmac: stmmac_platform: use correct setup function for gmac4

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Message-Id: <20161208.113602.193796703301981430.davem@davemloft.net>
Date:   Thu, 08 Dec 2016 11:36:02 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     niklas.cassel@...s.com
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com, niklass@...s.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH 3/3] net: stmmac: stmmac_platform: use correct
 setup function for gmac4

From: Niklas Cassel <niklas.cassel@...s.com>
Date: Wed, 7 Dec 2016 13:41:08 +0100

> From: Niklas Cassel <niklas.cassel@...s.com>
> 
> devicetree binding for stmmac states:
> - compatible: Should be "snps,dwmac-<ip_version>", "snps,dwmac"
> 	For backwards compatibility: "st,spear600-gmac" is also supported.
> 
> Previously, when specifying "snps,dwmac-4.10a", "snps,dwmac" as your
> compatible string, plat_stmmacenet_data would have both has_gmac and
> has_gmac4 set.
> 
> This would lead to stmmac_hw_init calling dwmac1000_setup rather than
> dwmac4_setup, resulting in a non-functional driver.
> This happened since the check for has_gmac is done before the check for
> has_gmac4. However, the order should not matter, so it does not make sense
> to have both set.
> 
> If something is valid for both, you should do as the stmmac_interrupt does:
> if (priv->plat->has_gmac || priv->plat->has_gmac4) ...
> 
> The places where it was obvious that the author actually meant
> if (has_gmac || has_gmac4) rather than if (has_gmac) has been updated.
> 
> Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
> Acked-by: Alexandre TORGUE <alexandre.torgue@...com>

Applied.