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net: ethernet: fix suspend/resume in davinci_emac

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This patch reverts commit 3243ff2a05 ("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: 3243ff2a05 ("net: ethernet: davinci_emac: Deduplicate bus_find_device() by name matching")
Cc: stable@vger.kernel.org
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bartosz Golaszewski 2018-06-19 14:44:00 +02:00 committed by David S. Miller
parent 7892bd0810
commit dc45519eb1
1 changed files with 13 additions and 2 deletions
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15
drivers/net/ethernet/ti/davinci_emac.c
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@ -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)