tree 1577dbd507c39c90a678ea3006178c0b00df1430
parent e46772a6946a7d1f3fbbc1415871851d6651f1d4
author Andrew Lunn <andrew@lunn.ch> 1512605156 +0100
committer David S. Miller <davem@davemloft.net> 1512672785 -0500

net: dsa: mv88e6xxx: Fix interrupt masking on removal

When removing the interrupt handling code, we should mask the
generation of interrupts. The code however unmasked all
interrupts. This can then cause a new interrupt. We then get into a
deadlock where the interrupt thread is waiting to run, and the code
continues, trying to remove the interrupt handler, which means waiting
for the thread to complete. On a UP machine this deadlocks.

Fix so we really mask interrupts in the hardware. The same error is
made in the error path when install the interrupt handling code.

Fixes: 3460a5770ce9 ("net: dsa: mv88e6xxx: Mask g1 interrupts and free interrupt")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>