From: Matthias Brugger Date: Thu, 19 Feb 2015 10:41:33 +0000 (+0100) Subject: clocksource: mtk: Fix race conditions in probe code X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d4a19eb3b15a4ba98f627182f48d5bc0cffae670;p=linux-beck.git clocksource: mtk: Fix race conditions in probe code We have two race conditions in the probe code which could lead to a null pointer dereference in the interrupt handler. The interrupt handler accesses the clockevent device, which may not yet be registered. First race condition happens when the interrupt handler gets registered before the interrupts get disabled. The second race condition happens when the interrupts get enabled, but the clockevent device is not yet registered. Fix that by disabling the interrupts before we register the interrupt and enable the interrupts after the clockevent device got registered. Reported-by: Gongbae Park Signed-off-by: Matthias Brugger Cc: stable@vger.kernel.org Signed-off-by: Daniel Lezcano --- diff --git a/drivers/clocksource/mtk_timer.c b/drivers/clocksource/mtk_timer.c index 32a3d25795d3..68ab42356d0e 100644 --- a/drivers/clocksource/mtk_timer.c +++ b/drivers/clocksource/mtk_timer.c @@ -224,6 +224,8 @@ static void __init mtk_timer_init(struct device_node *node) } rate = clk_get_rate(clk); + mtk_timer_global_reset(evt); + if (request_irq(evt->dev.irq, mtk_timer_interrupt, IRQF_TIMER | IRQF_IRQPOLL, "mtk_timer", evt)) { pr_warn("failed to setup irq %d\n", evt->dev.irq); @@ -232,8 +234,6 @@ static void __init mtk_timer_init(struct device_node *node) evt->ticks_per_jiffy = DIV_ROUND_UP(rate, HZ); - mtk_timer_global_reset(evt); - /* Configure clock source */ mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN); clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC), @@ -241,10 +241,11 @@ static void __init mtk_timer_init(struct device_node *node) /* Configure clock event */ mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT); - mtk_timer_enable_irq(evt, GPT_CLK_EVT); - clockevents_config_and_register(&evt->dev, rate, 0x3, 0xffffffff); + + mtk_timer_enable_irq(evt, GPT_CLK_EVT); + return; err_clk_disable: