lkml.org 
[lkml]   [2017]   [Aug]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 6/6] alarmtimer: Fix unavailable wake-up source in sysfs
Date
From: Geert Uytterhoeven <geert+renesas@glider.be>

Currently the alarmtimer registers a wake-up source unconditionally,
regardless of the system having a (wake-up capable) RTC or not.
Hence the alarmtimer will always show up in
/sys/kernel/debug/wakeup_sources, even if it is not available, and thus
cannot be a wake-up source.

To fix this, postpone registration until a wake-up capable RTC device is
added.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Miroslav Lichvar <mlichvar@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
kernel/time/alarmtimer.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 0b8ff7d..73a2b47 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -56,9 +56,9 @@ static ktime_t freezer_delta;
static DEFINE_SPINLOCK(freezer_delta_lock);
#endif

+#ifdef CONFIG_RTC_CLASS
static struct wakeup_source *ws;

-#ifdef CONFIG_RTC_CLASS
/* rtc timer and device for setting alarm wakeups at suspend */
static struct rtc_timer rtctimer;
static struct rtc_device *rtcdev;
@@ -89,6 +89,7 @@ static int alarmtimer_rtc_add_device(struct device *dev,
{
unsigned long flags;
struct rtc_device *rtc = to_rtc_device(dev);
+ struct wakeup_source *__ws;

if (rtcdev)
return -EBUSY;
@@ -98,13 +99,20 @@ static int alarmtimer_rtc_add_device(struct device *dev,
if (!device_may_wakeup(rtc->dev.parent))
return -1;

+ __ws = wakeup_source_register("alarmtimer");
+
spin_lock_irqsave(&rtcdev_lock, flags);
if (!rtcdev) {
rtcdev = rtc;
/* hold a reference so it doesn't go away */
get_device(dev);
+ ws = __ws;
+ __ws = NULL;
}
spin_unlock_irqrestore(&rtcdev_lock, flags);
+
+ wakeup_source_unregister(__ws);
+
return 0;
}

@@ -860,7 +868,6 @@ static int __init alarmtimer_init(void)
error = PTR_ERR(pdev);
goto out_drv;
}
- ws = wakeup_source_register("alarmtimer");
return 0;

out_drv:
--
2.7.4
\
 
 \ /
  Last update: 2017-08-18 20:52    [W:0.044 / U:0.424 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site