From: Bartosz Golaszewski <brgl@bgdev•pl>
To: Grygorii Strashko <grygorii.strashko@ti•com>,
"David S . Miller" <davem@davemloft•net>,
Florian Fainelli <f.fainelli@gmail•com>,
Dan Carpenter <dan.carpenter@oracle•com>,
Ivan Khoronzhuk <ivan.khoronzhuk@linaro•org>,
Rob Herring <robh@kernel•org>, Lukas Wunner <lukas@wunner•de>,
Kevin Hilman <khilman@kernel•org>,
David Lechner <david@lechnology•com>,
Sekhar Nori <nsekhar@ti•com>, Andrew Lunn <andrew@lunn•ch>
Cc: linux-omap@vger•kernel.org, netdev@vger•kernel.org,
linux-kernel@vger•kernel.org,
Bartosz Golaszewski <bgolaszewski@baylibre•com>,
stable@vger•kernel.org
Subject: [PATCH 1/3] net: ethernet: fix suspend/resume in davinci_emac
Date: Tue, 19 Jun 2018 18:09:48 +0200 [thread overview]
Message-ID: <20180619160950.6283-2-brgl@bgdev.pl> (raw)
In-Reply-To: <20180619160950.6283-1-brgl@bgdev.pl>
From: Bartosz Golaszewski <bgolaszewski@baylibre•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@vger•kernel.org
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre•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);
+}
+
/**
* 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
next prev parent reply other threads:[~2018-06-19 16:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-19 16:09 [PATCH 0/3] net: davinci_emac: fix suspend/resume (both a regression and a common clk problem) Bartosz Golaszewski
2018-06-19 16:09 ` Bartosz Golaszewski [this message]
2018-06-19 16:55 ` [PATCH 1/3] net: ethernet: fix suspend/resume in davinci_emac Florian Fainelli
2018-06-20 7:56 ` Bartosz Golaszewski
2018-06-19 18:00 ` Lukas Wunner
2018-06-19 16:09 ` [PATCH 2/3] net: phy: set the of_node in the mdiodev's struct device Bartosz Golaszewski
2018-06-19 16:55 ` Florian Fainelli
2018-06-19 16:09 ` [PATCH 3/3] net: davinci_emac: match the mdio device against its compatible if possible Bartosz Golaszewski
2018-06-19 16:56 ` Florian Fainelli
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