Mac80211 SW crypto handles replacing PTK keys correctly.

Don't trigger needless warnings or workarounds when the driver can only
use the known good SW crypto provided by mac80211.

Signed-off-by: Alexander Wetzel <[email protected]>
---
 net/mac80211/main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index e56650a9838e..2b608044ae23 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -1060,6 +1060,13 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
                wiphy_ext_feature_set(local->hw.wiphy,
                                      NL80211_EXT_FEATURE_EXT_KEY_ID);
 
+       /* Mac80211 and therefore all cards only using SW crypto are able to
+        * handle PTK rekeys correctly
+        */
+       if (!local->ops->set_key)
+               wiphy_ext_feature_set(local->hw.wiphy,
+                                     NL80211_EXT_FEATURE_CAN_REPLACE_PTK0);
+
        /*
         * Calculate scan IE length -- we need this to alloc
         * memory and to subtract from the driver limit. It
-- 
2.21.0

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