From: Peter Popovec Date: Sat, 15 Dec 2012 06:57:25 +0000 (-0800) Subject: Input: walkera0701 - fix crash on startup X-Git-Tag: firefly_0821_release~7541^2~195 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ada84ad6dd091c7ee6ce70a01fd5dc214eb1d96d;p=firefly-linux-kernel-4.4.55.git Input: walkera0701 - fix crash on startup commit a455e2985f57e2a71566bb8850094af38b2c932d upstream. The driver's timer must be set up before enabling IRQ handler, otherwise bad things may happen. Reported-and-tested-by: Fengguang Wu Signed-off-by: Peter Popovec Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/input/joystick/walkera0701.c b/drivers/input/joystick/walkera0701.c index 4dfa1eed4b7c..f8f892b076e8 100644 --- a/drivers/input/joystick/walkera0701.c +++ b/drivers/input/joystick/walkera0701.c @@ -196,6 +196,7 @@ static void walkera0701_close(struct input_dev *dev) struct walkera_dev *w = input_get_drvdata(dev); parport_disable_irq(w->parport); + hrtimer_cancel(&w->timer); } static int walkera0701_connect(struct walkera_dev *w, int parport) @@ -224,6 +225,9 @@ static int walkera0701_connect(struct walkera_dev *w, int parport) if (parport_claim(w->pardevice)) goto init_err1; + hrtimer_init(&w->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + w->timer.function = timer_handler; + w->input_dev = input_allocate_device(); if (!w->input_dev) goto init_err2; @@ -254,8 +258,6 @@ static int walkera0701_connect(struct walkera_dev *w, int parport) if (err) goto init_err3; - hrtimer_init(&w->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); - w->timer.function = timer_handler; return 0; init_err3: @@ -271,7 +273,6 @@ static int walkera0701_connect(struct walkera_dev *w, int parport) static void walkera0701_disconnect(struct walkera_dev *w) { - hrtimer_cancel(&w->timer); input_unregister_device(w->input_dev); parport_release(w->pardevice); parport_unregister_device(w->pardevice);