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cfg80211: Pass lockdep expression to RCU lists 

rdev->sched_scan_req_list maybe traversed using list_for_each_entry_rcu
outside an RCU read-side critical section but under the protection
of rtnl_mutex.

Hence, add corresponding lockdep expression to silence false-positive
warnings, and harden RCU lists.

Signed-off-by: Amol Grover <frextrite@gmail.com>
Link: https://lore.kernel.org/r/20200219091102.10709-1-frextrite@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Amol Grover 2020-02-19 14:41:04 +05:30 committed by Johannes Berg
parent 92df9f8a74
commit 3ee9306b35
1 changed files with 2 additions and 3 deletions
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5
net/wireless/scan.c
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@ -556,9 +556,8 @@ cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
{
struct cfg80211_sched_scan_request *pos;
WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list) {
list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
lockdep_rtnl_is_held()) {
if (pos->reqid == reqid)
return pos;
}