tree c4b97d20fc4bb5a597c5ed4b2856597bc39a043f
parent 7ff8f2104cc9f371d64fc87a3f9a08e6e88f6614
author Phil Elwell <phil@raspberrypi.org> 1536762716 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1573039081 +0100

sc16is7xx: Fix for "Unexpected interrupt: 8"

[ Upstream commit 30ec514d440cf2c472c8e4b0079af2c731f71a3e ]

The SC16IS752 has an Enhanced Feature Register which is aliased at the
same address as the Interrupt Identification Register; accessing it
requires that a magic value is written to the Line Configuration
Register. If an interrupt is raised while the EFR is mapped in then
the ISR won't be able to access the IIR, leading to the "Unexpected
interrupt" error messages.

Avoid the problem by claiming a mutex around accesses to the EFR
register, also claiming the mutex in the interrupt handler work
item (this is equivalent to disabling interrupts to interlock against
a non-threaded interrupt handler).

See: https://github.com/raspberrypi/linux/issues/2529

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>