From: Semen Protsenko <semen.protsenko@globallogic.com>
Date: Wed, 22 Apr 2015 13:20:41 +0000 (+0300)
Subject: gpio: max732x: Fix irq-events handler
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~191^2~66
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=606f13e9efa0892561e7c471242e4ad0bcaf6ecb;p=pandora-kernel.git

gpio: max732x: Fix irq-events handler

MAX732X clears all pending interrupts on I2C read (when interrupts
register is being read). Driver doesn't need to send any ACKs when
interrupt was handled. So replace handle_edge_irq() with
handle_simple_irq().

Using handle_edge_irq() (w/o .irq_ack callback set) may lead to NULL
pointer dereference in some cases. E.g. this was observed on
hibernation process:

  Unable to handle kernel NULL pointer dereference at virtual address 0
  Backtrace:
  (handle_edge_irq) from (resend_irqs)
  (resend_irqs) from (tasklet_action)
  (tasklet_action) from (__do_softirq)
  (__do_softirq) from (run_ksoftirqd)
  (run_ksoftirqd) from (smpboot_thread_fn)
  (smpboot_thread_fn) from (kthread)
  (kthread) from (ret_from_fork)

Signed-off-by: Semen Protsenko <semen.protsenko@globallogic.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---

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