[PATCH 4.13 038/160] net: dsa: mv88e6xxx: lock mutex when freeing IRQs

[Greg Kroah-Hartman]

4.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vivien Didelot <vivien.dide...@savoirfairelinux.com>


[ Upstream commit b32ca44a88def4bf92626d8777494c6f14638c42 ]

mv88e6xxx_g2_irq_free locks the registers mutex, but not
mv88e6xxx_g1_irq_free, which results in a stack trace from
assert_reg_lock when unloading the mv88e6xxx module. Fix this.

Fixes: 3460a5770ce9 ("net: dsa: mv88e6xxx: Mask g1 interrupts and free 
interrupt")
Signed-off-by: Vivien Didelot <vivien.dide...@savoirfairelinux.com>
Reviewed-by: Florian Fainelli <f.faine...@gmail.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/dsa/mv88e6xxx/chip.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -4019,7 +4019,9 @@ static void mv88e6xxx_remove(struct mdio
        if (chip->irq > 0) {
                if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_G2_INT))
                        mv88e6xxx_g2_irq_free(chip);
+               mutex_lock(&chip->reg_lock);
                mv88e6xxx_g1_irq_free(chip);
+               mutex_unlock(&chip->reg_lock);
        }
 }