irq: Add irq_set_chained_handler_and_data()
authorRussell King <rmk+kernel@arm.linux.org.uk>
Tue, 16 Jun 2015 22:06:20 +0000 (23:06 +0100)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 18 Jun 2015 12:03:08 +0000 (14:03 +0200)
commit3b0f95be143bea1aa47beb20134ef82e4e4068dc
tree730822397420dd40a9cf50d8b3bc26e829522ef5
parent6fd4899a54a522ccd6a24fea2318d3b515b95945
irq: Add irq_set_chained_handler_and_data()

Driver authors seem to get the ordering of irq_set_chained_handler()
and irq_set_handler_data() wrong - ordering the former before the
latter.  This opens a race window where, if there is an interrupt
pending, the handler will be called between these two calls,
potentially resulting in an oops.

Provide a single interface to set both of these together, especially
as that's commonly what is required.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/E1Z4yzs-0002Rw-4B@rmk-PC.arm.linux.org.uk
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
include/linux/irq.h
kernel/irq/chip.c