Commits
Russell King committed 9739d3d1bbb
net: dsa: mv88e6xxx: fix lockup on warm boot
[ Upstream commit 0395823b8d9a4d87bd1bf74359123461c2ae801b ]
If the switch is not hardware reset on a warm boot, interrupts can be
left enabled, and possibly pending. This will cause us to enter an
infinite loop trying to service an interrupt we are unable to handle,
thereby preventing the kernel from booting.
Ensure that the global 2 interrupt sources are disabled before we claim
the parent interrupt.
Observed on the ZII development revision B and C platforms with
reworked serdes support, and using reboot -f to reboot the platform.
Fixes: dc30c35be720 ("net: dsa: mv88e6xxx: Implement interrupt support.")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>