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authorYongbae Park <yongbae2@gmail.com>2015-03-03 13:46:49 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2015-03-05 17:01:36 +0300
commit7b8f10da3bf1056546133c9f54f49ce389fd95ab (patch)
tree5909a392ea9dcd05abde742b6f61efbdd26f9d36 /drivers/clocksource
parent13a7a6ac0a11197edcd0f756a035f472b42cdf8b (diff)
downloadlinux-7b8f10da3bf1056546133c9f54f49ce389fd95ab.tar.xz
clocksource: efm32: Fix a NULL pointer dereference
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>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/time-efm32.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/clocksource/time-efm32.c b/drivers/clocksource/time-efm32.c
index bba62f9deefb..ec57ba2bbd87 100644
--- a/drivers/clocksource/time-efm32.c
+++ b/drivers/clocksource/time-efm32.c
@@ -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: