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cfg80211: track time using boottime 

The cfg80211 layer uses get_seconds() to read the current time
in its supend handling. This function is deprecated because of the 32-bit
time_t overflow, and it can cause unexpected behavior when the time
changes due to settimeofday() calls or leap second updates.

In many cases, we want to use monotonic time instead, however cfg80211
explicitly tracks the time spent in suspend, so this changes the
driver over to use ktime_get_boottime_seconds(), which is slightly
slower, but not used in a fastpath here.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Arnd Bergmann 2018-06-18 17:11:14 +02:00 committed by Johannes Berg
parent 8ba6731ad4
commit fe0984d389
2 changed files with 3 additions and 3 deletions
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2
net/wireless/core.h
View File

@ -76,7 +76,7 @@ struct cfg80211_registered_device {
struct cfg80211_scan_request *scan_req; /* protected by RTNL */
struct sk_buff *scan_msg;
struct list_head sched_scan_req_list;
unsigned long suspend_at;
time64_t suspend_at;
struct work_struct scan_done_wk;
struct genl_info *cur_cmd_info;

4
net/wireless/sysfs.c
View File

@ -102,7 +102,7 @@ static int wiphy_suspend(struct device *dev)
struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
int ret = 0;
rdev->suspend_at = get_seconds();
rdev->suspend_at = ktime_get_boottime_seconds();
rtnl_lock();
if (rdev->wiphy.registered) {
@ -130,7 +130,7 @@ static int wiphy_resume(struct device *dev)
int ret = 0;
/* Age scan results with time spent in suspend */
cfg80211_bss_age(rdev, get_seconds() - rdev->suspend_at);
cfg80211_bss_age(rdev, ktime_get_boottime_seconds() - rdev->suspend_at);
rtnl_lock();
if (rdev->wiphy.registered && rdev->ops->resume)