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authorSudeep Holla <sudeep.holla@arm.com>2014-09-29 01:50:05 +0200
committerDaniel Lezcano <daniel.lezcano@linaro.org>2014-09-29 01:50:05 +0200
commitc387f07e6205cc13f57c1def5f885bf0a20e1c2d (patch)
tree7817a8d82c95bdeda912a9e4611a9d893b7a16b3 /drivers/clocksource/arm_arch_timer.c
parent04f7e3e5134b9517bd9a78a84a9ee0f982d3ebdd (diff)
clocksource: arm_arch_timer: Discard unavailable timers correctly
Currently we wait until both cp15 and mem timers are probed if we have both timer device nodes present in the device tree without checking if the device is actually available. If one of the timer device node present is disabled, the system locks up on the boot as no timer gets registered. This patch adds the check for the availability of the timer device so that unavailable timers are discarded correctly. It also adds the missing of_node_put. Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource/arm_arch_timer.c')
-rw-r--r--drivers/clocksource/arm_arch_timer.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 5163ec13429d..7e267e3990ab 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -616,17 +616,29 @@ static const struct of_device_id arch_timer_mem_of_match[] __initconst = {
{},
};
+static bool __init
+arch_timer_probed(int type, const struct of_device_id *matches)
+{
+ struct device_node *dn;
+ bool probed = false;
+
+ dn = of_find_matching_node(NULL, matches);
+ if (dn && of_device_is_available(dn) && (arch_timers_present & type))
+ probed = true;
+ of_node_put(dn);
+
+ return probed;
+}
+
static void __init arch_timer_common_init(void)
{
unsigned mask = ARCH_CP15_TIMER | ARCH_MEM_TIMER;
/* Wait until both nodes are probed if we have two timers */
if ((arch_timers_present & mask) != mask) {
- if (of_find_matching_node(NULL, arch_timer_mem_of_match) &&
- !(arch_timers_present & ARCH_MEM_TIMER))
+ if (!arch_timer_probed(ARCH_MEM_TIMER, arch_timer_mem_of_match))
return;
- if (of_find_matching_node(NULL, arch_timer_of_match) &&
- !(arch_timers_present & ARCH_CP15_TIMER))
+ if (!arch_timer_probed(ARCH_CP15_TIMER, arch_timer_of_match))
return;
}