[PATCH 0/2] sc16is7xx interrupt fixes

[Phil Elwell <phil@raspberrypi.org>]

The interrupt handling of the sc16is7xx driver is broken in a number of ways,
as observed by multiple Raspberry Pi users. The attached patches attempt to
address its failings, with apparent success.

The first is a workaround for a side-effect of the switch away from using a
thread IRQ, a change which has necessitated using what is actually a
level-triggered interrupt as if it were edge-triggered. Doing so is fraught
with potential race conditions, but the patch makes them much less likely.

The second is a workaround for a bug in the design of the SC16IS752 which
requires mutual exclusion between the interrupt handler and access to the
Enhanced Features Register.

Phil Elwell (2):
  sc16is7xx: Fix for multi-channel stall
  sc16is7xx: Fix for "Unexpected interrupt: 8"

 drivers/tty/serial/sc16is7xx.c | 50 +++++++++++++++++++++++++++++++++++++-----
 1 file changed, 44 insertions(+), 6 deletions(-)

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2.7.4