linux-kernel - [PATCH 0/2] sc16is7xx interrupt fixes

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Message-Id: <1536762716-30673-1-git-send-email-phil@raspberrypi.org>
Date:   Wed, 12 Sep 2018 15:31:54 +0100
From:   Phil Elwell <phil@...pberrypi.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, Alexander Graf <agraf@...e.de>,
        Stefan Wahren <stefan.wahren@...e.com>
Cc:     Phil Elwell <phil@...pberrypi.org>
Subject: [PATCH 0/2] sc16is7xx interrupt fixes

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(-)

-- 
2.7.4