cfg80211: regulatory: reset regdomain in case of error

Reset regdomain to world regdomain in case
of errors in set_regdom() function.

This will fix a problem with such scenario:
- iw reg set US
- iw reg set 00
- iw reg set US
The last step always fail and we get deadlock
in kernel regulatory code. Next setting new
regulatory wasn't possible due to:

Pending regulatory request, waiting for it to be processed...

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Acked-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 4c50c21d6f52..f0541370e68e 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -2373,6 +2373,7 @@ static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
 int set_regdom(const struct ieee80211_regdomain *rd)
 {
         struct regulatory_request *lr;
+        bool user_reset = false;
         int r;
 
         if (!reg_is_valid_request(rd->alpha2)) {
@@ -2389,6 +2390,7 @@ int set_regdom(const struct ieee80211_regdomain *rd)
                 break;
         case NL80211_REGDOM_SET_BY_USER:
                 r = reg_set_rd_user(rd, lr);
+                user_reset = true;
                 break;
         case NL80211_REGDOM_SET_BY_DRIVER:
                 r = reg_set_rd_driver(rd, lr);
@@ -2402,8 +2404,14 @@ int set_regdom(const struct ieee80211_regdomain *rd)
         }
 
         if (r) {
-                if (r == -EALREADY)
+                switch (r) {
+                case -EALREADY:
                         reg_set_request_processed();
+                        break;
+                default:
+                        /* Back to world regulatory in case of errors */
+                        restore_regulatory_settings(user_reset);
+                }
 
                 kfree(rd);
                 return r;