net: mdiobus: Remove WARN_ON_ONCE(in_interrupt())

in_interrupt() is ill defined and does not provide what the name
suggests. The usage especially in driver code is deprecated and a tree wide
effort to clean up and consolidate the (ab)usage of in_interrupt() and
related checks is happening.

In this case the check covers only parts of the contexts in which these
functions cannot be called. It fails to detect preemption or interrupt
disabled invocations.

As the functions which contain these warnings invoke mutex_lock() which
contains a broad variety of checks (always enabled or debug option
dependent) and therefore covers all invalid conditions already, there is no
point in having inconsistent warnings in those drivers. The conditional
return is not really valuable in practice either.

Just remove them.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 0af20faad69df21781345727762a403317a2794b..757e950fb745bb4c5869c93f9669ee634de7843c 100644 (file)
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -825,9 +825,6 @@ int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)
 {
        int retval;
 
-       if (WARN_ON_ONCE(in_interrupt()))
-               return -EINVAL;
-
        mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
        retval = __mdiobus_read(bus, addr, regnum);
        mutex_unlock(&bus->mdio_lock);
@@ -850,9 +847,6 @@ int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
 {
        int retval;
 
-       if (WARN_ON_ONCE(in_interrupt()))
-               return -EINVAL;
-
        mutex_lock(&bus->mdio_lock);
        retval = __mdiobus_read(bus, addr, regnum);
        mutex_unlock(&bus->mdio_lock);
@@ -879,9 +873,6 @@ int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)
 {
        int err;
 
-       if (WARN_ON_ONCE(in_interrupt()))
-               return -EINVAL;
-
        mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
        err = __mdiobus_write(bus, addr, regnum, val);
        mutex_unlock(&bus->mdio_lock);
@@ -905,9 +896,6 @@ int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
 {
        int err;
 
-       if (WARN_ON_ONCE(in_interrupt()))
-               return -EINVAL;
-
        mutex_lock(&bus->mdio_lock);
        err = __mdiobus_write(bus, addr, regnum, val);
        mutex_unlock(&bus->mdio_lock);
@@ -929,9 +917,6 @@ int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set)
 {
        int err;
 
-       if (WARN_ON_ONCE(in_interrupt()))
-               return -EINVAL;
-
        mutex_lock(&bus->mdio_lock);
        err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);
        mutex_unlock(&bus->mdio_lock);