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net: phy: core: use genphy version of callbacks read_status and config_aneg per default

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read_status and config_aneg are the only mandatory callbacks and most
of the time the generic implementation is used by drivers.
So make the core fall back to the generic version if a driver doesn't
implement the respective callback.

Also currently the core doesn't seem to verify that drivers implement
the mandatory calls. If a driver doesn't do so we'd just get a NPE.
With this patch this potential issue doesn't exit any longer.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2017-11-30 23:46:19 +01:00 committed by David S. Miller
parent efbae71643
commit 00fde79532
2 changed files with 22 additions and 16 deletions
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5
drivers/net/phy/phy.c
View File

@ -493,7 +493,10 @@ static int phy_start_aneg_priv(struct phy_device *phydev, bool sync)
/* Invalidate LP advertising flags */
phydev->lp_advertising = 0;
err = phydev->drv->config_aneg(phydev);
if (phydev->drv->config_aneg)
err = phydev->drv->config_aneg(phydev);
else
err = genphy_config_aneg(phydev);
if (err < 0)
goto out_unlock;

33
include/linux/phy.h
View File

@ -497,13 +497,13 @@ struct phy_device {
* flags: A bitfield defining certain other features this PHY
* supports (like interrupts)
*
* The drivers must implement config_aneg and read_status. All
* other functions are optional. Note that none of these
* functions should be called from interrupt time. The goal is
* for the bus read/write functions to be able to block when the
* bus transaction is happening, and be freed up by an interrupt
* (The MPC85xx has this ability, though it is not currently
* supported in the driver).
* All functions are optional. If config_aneg or read_status
* are not implemented, the phy core uses the genphy versions.
* Note that none of these functions should be called from
* interrupt time. The goal is for the bus read/write functions
* to be able to block when the bus transaction is happening,
* and be freed up by an interrupt (The MPC85xx has this ability,
* though it is not currently supported in the driver).
*/
struct phy_driver {
struct mdio_driver_common mdiodrv;
@ -841,14 +841,6 @@ int phy_aneg_done(struct phy_device *phydev);
int phy_stop_interrupts(struct phy_device *phydev);
int phy_restart_aneg(struct phy_device *phydev);
static inline int phy_read_status(struct phy_device *phydev)
{
if (!phydev->drv)
return -EIO;
return phydev->drv->read_status(phydev);
}
#define phydev_err(_phydev, format, args...) \
dev_err(&_phydev->mdio.dev, format, ##args)
@ -890,6 +882,17 @@ int genphy_c45_read_pma(struct phy_device *phydev);
int genphy_c45_pma_setup_forced(struct phy_device *phydev);
int genphy_c45_an_disable_aneg(struct phy_device *phydev);
static inline int phy_read_status(struct phy_device *phydev)
{
if (!phydev->drv)
return -EIO;
if (phydev->drv->read_status)
return phydev->drv->read_status(phydev);
else
return genphy_read_status(phydev);
}
void phy_driver_unregister(struct phy_driver *drv);
void phy_drivers_unregister(struct phy_driver *drv, int n);
int phy_driver_register(struct phy_driver *new_driver, struct module *owner);