From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bmailout1.hostsharing.net ([83.223.95.100]:52749 "EHLO bmailout1.hostsharing.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965731AbeFSNwV (ORCPT ); Tue, 19 Jun 2018 09:52:21 -0400 Date: Tue, 19 Jun 2018 15:52:19 +0200 From: Lukas Wunner To: Bartosz Golaszewski Cc: Grygorii Strashko , "David S . Miller" , Florian Fainelli , Dan Carpenter , Ivan Khoronzhuk , Rob Herring , Kevin Hilman , David Lechner , Sekhar Nori , linux-omap@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski , stable@vger.kernel.org Subject: Re: [PATCH] net: ethernet: fix suspend/resume in davinci_emac Message-ID: <20180619135219.GA7312@wunner.de> References: <20180619124400.11878-1-brgl@bgdev.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180619124400.11878-1-brgl@bgdev.pl> Sender: stable-owner@vger.kernel.org List-ID: On Tue, Jun 19, 2018 at 02:44:00PM +0200, Bartosz Golaszewski wrote: > From: Bartosz Golaszewski > > 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@vger.kernel.org > Signed-off-by: Bartosz Golaszewski Acked-by: Lukas Wunner My apologies Bartosz, it wasn't clear to me that the driver deliberately only matched against the prefix of the name. Sorry for the breakage. > --- > 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); > +} > + > /** > * emac_dev_open - EMAC device open > * @ndev: The DaVinci EMAC network adapter > @@ -1484,8 +1489,14 @@ static int emac_dev_open(struct net_device *ndev) > > /* use the first phy on the bus if pdata did not give us a phy id */ > if (!phydev && !priv->phy_id) { > - phy = bus_find_device_by_name(&mdio_bus_type, NULL, > - "davinci_mdio"); > + /* NOTE: 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. > + */ > + phy = bus_find_device(&mdio_bus_type, NULL, NULL, > + match_first_device); > if (phy) { > priv->phy_id = dev_name(phy); > if (!priv->phy_id || !*priv->phy_id) > -- > 2.17.1 >