lkml.org 
[lkml]   [2020]   [Jan]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/4] alarmtimer: Unregister wakeup source when module get fails
Date
The alarmtimer_rtc_add_device() function creates a wakeup source and
then tries to grab a module reference. If that fails we return early
with a -1, but forget to remove the wakeup source. Cleanup this exit
path so we don't leave a dangling wakeup source allocated and named
'alarmtimer' that will conflict with another RTC device that may be
registered.

Fixes: 51218298a25e ("alarmtimer: Ensure RTC module is not unloaded")
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
kernel/time/alarmtimer.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 451f9d05ccfe..4b11f0309eee 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -88,6 +88,7 @@ static int alarmtimer_rtc_add_device(struct device *dev,
unsigned long flags;
struct rtc_device *rtc = to_rtc_device(dev);
struct wakeup_source *__ws;
+ int ret = 0;

if (rtcdev)
return -EBUSY;
@@ -102,8 +103,8 @@ static int alarmtimer_rtc_add_device(struct device *dev,
spin_lock_irqsave(&rtcdev_lock, flags);
if (!rtcdev) {
if (!try_module_get(rtc->owner)) {
- spin_unlock_irqrestore(&rtcdev_lock, flags);
- return -1;
+ ret = -1;
+ goto unlock;
}

rtcdev = rtc;
@@ -112,11 +113,12 @@ static int alarmtimer_rtc_add_device(struct device *dev,
ws = __ws;
__ws = NULL;
}
+unlock:
spin_unlock_irqrestore(&rtcdev_lock, flags);

wakeup_source_unregister(__ws);

- return 0;
+ return ret;
}

static inline void alarmtimer_rtc_timer_init(void)
--
Sent by a computer, using git, on the internet
\
 
 \ /
  Last update: 2020-01-09 16:59    [W:0.093 / U:19.320 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site