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clocksource: efm32: Fix a NULL pointer dereference

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The initialisation of the efm32 clocksource first sets up the irq and only
after that initialises the data needed for irq handling. In case this
initialisation is delayed the irq handler would dereference a NULL pointer.

I'm not aware of anything that could delay the process in such a way, but it's
better to be safe than sorry, so setup the irq only when the clock event device
is ready.

Cc: stable@vger.kernel.org
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Yongbae Park <yongbae2@gmail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Yongbae Park 2015-03-03 19:46:49 +09:00 committed by Daniel Lezcano
parent 13a7a6ac0a
commit 7b8f10da3b
1 changed files with 2 additions and 2 deletions
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4
drivers/clocksource/time-efm32.c
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@ -225,12 +225,12 @@ static int __init efm32_clockevent_init(struct device_node *np)
clock_event_ddata.base = base;
clock_event_ddata.periodic_top = DIV_ROUND_CLOSEST(rate, 1024 * HZ);
setup_irq(irq, &efm32_clock_event_irq);
clockevents_config_and_register(&clock_event_ddata.evtdev,
DIV_ROUND_CLOSEST(rate, 1024),
0xf, 0xffff);
setup_irq(irq, &efm32_clock_event_irq);
return 0;
err_get_irq: