If we have a system which uses fixed PHY devices and calls
fixed_phy_register() then fixed_phy_unregister() we can exhaust the
number of fixed PHYs available after a while, since we keep incrementing
the variable phy_fixed_addr, but we never decrement it.
This patch fixes that by decrementing phy_fixed_addr during
fixed_phy_del(), and in order to do that, we need to move the
phy_fixed_addr integer and its spinlock above that function.
Fixes: a75951217472 ("net: phy: extend fixed driver with fixed_phy_register()")
Signed-off-by: Florian Fainelli <[email protected]>
---
drivers/net/phy/fixed_phy.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/net/phy/fixed_phy.c b/drivers/net/phy/fixed_phy.c
index 2d2e4339f0df..050bc5657b9d 100644
--- a/drivers/net/phy/fixed_phy.c
+++ b/drivers/net/phy/fixed_phy.c
@@ -286,6 +286,9 @@ err_regs:
}
EXPORT_SYMBOL_GPL(fixed_phy_add);
+static int phy_fixed_addr;
+static DEFINE_SPINLOCK(phy_fixed_addr_lock);
+
static void fixed_phy_del(int phy_addr)
{
struct fixed_mdio_bus *fmb = &platform_fmb;
@@ -297,14 +300,14 @@ static void fixed_phy_del(int phy_addr)
if (gpio_is_valid(fp->link_gpio))
gpio_free(fp->link_gpio);
kfree(fp);
+ spin_lock(&phy_fixed_addr_lock);
+ phy_fixed_addr--;
+ spin_unlock(&phy_fixed_addr_lock);
return;
}
}
}
-static int phy_fixed_addr;
-static DEFINE_SPINLOCK(phy_fixed_addr_lock);
-
struct phy_device *fixed_phy_register(unsigned int irq,
struct fixed_phy_status *status,
int link_gpio,
--
2.7.4
