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ath9k: Fix a locking bug in ath9k_add_interface()

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[ Upstream commit 461cf036057477805a8a391e5fd0f5264a5e56a8 ]

We tried to revert commit d9c52fd17cb4 ("ath9k: fix tx99 with monitor
mode interface") but accidentally missed part of the locking change.

The lock has to be held earlier so that we're holding it when we do
"sc->tx99_vif = vif;" and also there in the current code there is a
stray unlock before we have taken the lock.

Fixes: 6df0580be8bc ("ath9k: add back support for using active monitor interfaces for tx99")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2018-10-19 23:08:43 +03:00 committed by Greg Kroah-Hartman
parent ad196348b6
commit 191e8c8865
1 changed files with 1 additions and 2 deletions
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3
drivers/net/wireless/ath/ath9k/main.c
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@ -1250,6 +1250,7 @@ static int ath9k_add_interface(struct ieee80211_hw *hw,
struct ath_vif *avp = (void *)vif->drv_priv;
struct ath_node *an = &avp->mcast_node;
mutex_lock(&sc->mutex);
if (IS_ENABLED(CONFIG_ATH9K_TX99)) {
if (sc->cur_chan->nvifs >= 1) {
mutex_unlock(&sc->mutex);
@ -1258,8 +1259,6 @@ static int ath9k_add_interface(struct ieee80211_hw *hw,
sc->tx99_vif = vif;
}
mutex_lock(&sc->mutex);
ath_dbg(common, CONFIG, "Attach a VIF of type: %d\n", vif->type);
sc->cur_chan->nvifs++;