非generic phy的引用计数为0

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/drivers/net/phy/phy_device.c?h=v4.11.12&id=6d9f66ac7fec2a6ccd649e5909806dfe36f1fc25

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 0d8f4d3..8c8e15b 100644
--- a/ drivers/net/phy/phy_device.c
+++ b/ drivers/net/phy/phy_device.c

@@ -908,6 +908,7 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,

struct module *ndev_owner = dev->dev.parent->driver->owner;

struct mii_bus *bus = phydev->mdio.bus;

struct device *d = &phydev->mdio.dev;

+ bool using_genphy = false;

int err;

/* For Ethernet device drivers that register their own MDIO bus, we

@@ -920,11 +921,6 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,

return -EIO;

}

- if (!try_module_get(d->driver->owner)) {

- dev_err(&dev->dev, "failed to get the device driver module\n");

- return -EIO;

- }

-

get_device(d);

/* Assume that if there is no driver, that it doesn't

@@ -938,12 +934,22 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,

d->driver =

&genphy_driver[GENPHY_DRV_1G].mdiodrv.driver;

+ using_genphy = true;

+ }

+

+ if (!try_module_get(d->driver->owner)) {

+ dev_err(&dev->dev, "failed to get the device driver module\n");

+ err = -EIO;

+ goto error_put_device;

+ }

由于phy device 和 driver 特殊的匹配关系，因此如果不上这个patch的话，通过lsmod 看到的phy的ko的引用计数就是0。通过try_module_get 可以手动增加ko的引用计数.