[PATCH net 1/2] net: phy: don't use locking in phy_is_started

[Heiner Kallweit]

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 <li...@armlinux.org.uk>
Signed-off-by: Heiner Kallweit <hkallwe...@gmail.com>
---
 drivers/net/phy/phy.c | 11 +++++------
 include/linux/phy.h   | 15 +--------------
 2 files changed, 6 insertions(+), 20 deletions(-)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index ca5e0c0f018c..602816d70281 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -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);
 
diff --git a/include/linux/phy.h b/include/linux/phy.h
index ef20aeea10cc..127fcc9c3778 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -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);
-- 
2.20.1