netdev - Re: [PATCH 1/3] net: ethernet: fix suspend/resume in davinci

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Date:   Tue, 19 Jun 2018 09:55:31 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "David S . Miller" <davem@...emloft.net>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        Rob Herring <robh@...nel.org>, Lukas Wunner <lukas@...ner.de>,
        Kevin Hilman <khilman@...nel.org>,
        David Lechner <david@...hnology.com>,
        Sekhar Nori <nsekhar@...com>, Andrew Lunn <andrew@...n.ch>
Cc:     linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH 1/3] net: ethernet: fix suspend/resume in davinci_emac

On 06/19/2018 09:09 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> This patch reverts commit 3243ff2a05ec ("net: ethernet: davinci_emac:
> Deduplicate bus_find_device() by name matching") and adds a comment
> which should stop anyone from reintroducing the same "fix" in the future.
> 
> We can't use bus_find_device_by_name() here because the device name is
> not guaranteed to be 'davinci_mdio'. On some systems it can be
> 'davinci_mdio.0' so we need to use strncmp() against the first part of
> the string to correctly match it.
> 
> Fixes: 3243ff2a05ec ("net: ethernet: davinci_emac: Deduplicate bus_find_device() by name matching")
> Cc: stable@...r.kernel.org
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  drivers/net/ethernet/ti/davinci_emac.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
> index 06d7c9e4dcda..a1a6445b5a7e 100644
> --- a/drivers/net/ethernet/ti/davinci_emac.c
> +++ b/drivers/net/ethernet/ti/davinci_emac.c
> @@ -1385,6 +1385,11 @@ static int emac_devioctl(struct net_device *ndev, struct ifreq *ifrq, int cmd)
>  		return -EOPNOTSUPP;
>  }
>  
> +static int match_first_device(struct device *dev, void *data)
> +{
> +	return !strncmp(dev_name(dev), "davinci_mdio", 12);

	const char *bus_name = "davinci_mdio";

	return !strncmp(dev_name(dev), bus_name, strlen(bus_name));

Or even better yet, if you want to make sure this really is a PHY device
that you are trying to match, you could try to use sscanf() with PHY_ID_FMT.
-- 
Florian