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net: phy: don't use locking in phy_is_started

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Russell suggested to remove the locking from phy_is_started() because
the read is atomic anyway and actually the locking may be more
misleading.

Fixes: 2b3e88ea6528 ("net: phy: improve phy state checking")
Suggested-by: Russell King - ARM Linux admin <linux@armlinux.org.uk>
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 2019-02-13 20:11:40 +01:00 committed by David S. Miller
parent 39c1331962
commit a2fc9d7e36
2 changed files with 6 additions and 20 deletions
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11
drivers/net/phy/phy.c
View File

@ -553,7 +553,7 @@ int phy_start_aneg(struct phy_device *phydev)
if (err < 0)
goto out_unlock;
if (__phy_is_started(phydev)) {
if (phy_is_started(phydev)) {
if (phydev->autoneg == AUTONEG_ENABLE) {
err = phy_check_link_status(phydev);
} else {
@ -709,7 +709,7 @@ void phy_stop_machine(struct phy_device *phydev)
cancel_delayed_work_sync(&phydev->state_queue);
mutex_lock(&phydev->lock);
if (__phy_is_started(phydev))
if (phy_is_started(phydev))
phydev->state = PHY_UP;
mutex_unlock(&phydev->lock);
}
@ -839,15 +839,14 @@ EXPORT_SYMBOL(phy_stop_interrupts);
*/
void phy_stop(struct phy_device *phydev)
{
mutex_lock(&phydev->lock);
if (!__phy_is_started(phydev)) {
if (!phy_is_started(phydev)) {
WARN(1, "called from state %s\n",
phy_state_to_str(phydev->state));
mutex_unlock(&phydev->lock);
return;
}
mutex_lock(&phydev->lock);
if (phy_interrupt_is_valid(phydev))
phy_disable_interrupts(phydev);

15
include/linux/phy.h
View File

@ -674,26 +674,13 @@ phy_lookup_setting(int speed, int duplex, const unsigned long *mask,
size_t phy_speeds(unsigned int *speeds, size_t size,
unsigned long *mask);
static inline bool __phy_is_started(struct phy_device *phydev)
{
WARN_ON(!mutex_is_locked(&phydev->lock));
return phydev->state >= PHY_UP;
}
/**
* phy_is_started - Convenience function to check whether PHY is started
* @phydev: The phy_device struct
*/
static inline bool phy_is_started(struct phy_device *phydev)
{
bool started;
mutex_lock(&phydev->lock);
started = __phy_is_started(phydev);
mutex_unlock(&phydev->lock);
return started;
return phydev->state >= PHY_UP;
}
void phy_resolve_aneg_linkmode(struct phy_device *phydev);