| Message ID | 1410911445-19067-1-git-send-email-sudeep.holla@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 09/17, Sudeep Holla wrote: > Currently we wait until both nodes are probed if we have two timers > without checking if the device is actually available. This might device node is actually available? > result in non-functional system as no timer gets registered. > > This patch adds the check for the availablity of the timer device > so that unavailable timers are discarded correctly. > > Cc: Stephen Boyd <sboyd@codeaurora.org> > Cc: Mark Rutland <mark.rutland@arm.com> > Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> > --- Looks mostly ok. Comment below could be a follow up I guess. > drivers/clocksource/arm_arch_timer.c | 12 ++++++++---- > 1 file changed, 8 insertions(+), 4 deletions(-) > > diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c > index 5163ec1..4d025ad 100644 > --- a/drivers/clocksource/arm_arch_timer.c > +++ b/drivers/clocksource/arm_arch_timer.c > @@ -622,11 +622,15 @@ static void __init arch_timer_common_init(void) > > /* 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)) > + struct device_node *dn; > + > + dn = of_find_matching_node(NULL, arch_timer_mem_of_match); > + if (dn && of_device_is_available(dn) && > + !(arch_timers_present & ARCH_MEM_TIMER)) > return; > - if (of_find_matching_node(NULL, arch_timer_of_match) && > - !(arch_timers_present & ARCH_CP15_TIMER)) > + dn = of_find_matching_node(NULL, arch_timer_of_match); > + if (dn && of_device_is_available(dn) && > + !(arch_timers_present & ARCH_CP15_TIMER)) > return; Where's the of_node_put()?
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 5163ec1..4d025ad 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -622,11 +622,15 @@ static void __init arch_timer_common_init(void) /* 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)) + struct device_node *dn; + + dn = of_find_matching_node(NULL, arch_timer_mem_of_match); + if (dn && of_device_is_available(dn) && + !(arch_timers_present & ARCH_MEM_TIMER)) return; - if (of_find_matching_node(NULL, arch_timer_of_match) && - !(arch_timers_present & ARCH_CP15_TIMER)) + dn = of_find_matching_node(NULL, arch_timer_of_match); + if (dn && of_device_is_available(dn) && + !(arch_timers_present & ARCH_CP15_TIMER)) return; }
Currently we wait until both nodes are probed if we have two timers without checking if the device is actually available. This might result in non-functional system as no timer gets registered. This patch adds the check for the availablity of the timer device so that unavailable timers are discarded correctly. Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> --- drivers/clocksource/arm_arch_timer.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)