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[PATCH] p54: fix p54_set_key's return code

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p54 doesn't support AES-128-CMAC offload.

This patch will fix the noisy mac80211 warnings, when 802.11w is enabled: 
mac80211-phy189: failed to set key (4, ff:ff:ff:ff:ff:ff) to hardware (-22)
mac80211-phy189: failed to set key (5, ff:ff:ff:ff:ff:ff) to hardware (-22)

Signed-off-by: Christian Lamparter <chunkeey@xxxxxx>
---
diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c
index 635b423..d706480 100644
--- a/drivers/net/wireless/p54/p54common.c
+++ b/drivers/net/wireless/p54/p54common.c
@@ -2355,7 +2355,7 @@ static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
 			algo = P54_CRYPTO_AESCCMP;
 			break;
 		default:
-			return -EINVAL;
+			return -EOPNOTSUPP;
 		}
 	}
 

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