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ath5k: use spin_lock_irqsave for beacon lock

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ath5k_reset can be called from process context, which in turn can
call ath5k_beacon_config which takes the sc->block spinlock.  Since
it can also be taken in hard irq context, use spin_lock_irqsave
everywhere.  This fixes a potential deadlock in adhoc mode.

Changes-licensed-under: 3-Clause-BSD

Cc: stable@kernel.org
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bob Copeland 2009-02-15 12:06:10 -05:00 committed by John W. Linville
parent 0b6f582bd3
commit b5f03956c5
1 changed files with 3 additions and 3 deletions
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6
drivers/net/wireless/ath5k/base.c
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@ -1700,7 +1700,6 @@ ath5k_check_ibss_tsf(struct ath5k_softc *sc, struct sk_buff *skb,
} }
} }
static void static void
ath5k_tasklet_rx(unsigned long data) ath5k_tasklet_rx(unsigned long data)
{ {
@ -2216,6 +2215,7 @@ static void
ath5k_beacon_config(struct ath5k_softc *sc) ath5k_beacon_config(struct ath5k_softc *sc)
{ {
struct ath5k_hw *ah = sc->ah; struct ath5k_hw *ah = sc->ah;
unsigned long flags;
ath5k_hw_set_imr(ah, 0); ath5k_hw_set_imr(ah, 0);
sc->bmisscount = 0; sc->bmisscount = 0;
@ -2237,9 +2237,9 @@ ath5k_beacon_config(struct ath5k_softc *sc)
if (sc->opmode == NL80211_IFTYPE_ADHOC) { if (sc->opmode == NL80211_IFTYPE_ADHOC) {
if (ath5k_hw_hasveol(ah)) { if (ath5k_hw_hasveol(ah)) {
spin_lock(&sc->block); spin_lock_irqsave(&sc->block, flags);
ath5k_beacon_send(sc); ath5k_beacon_send(sc);
spin_unlock(&sc->block); spin_unlock_irqrestore(&sc->block, flags);
} }
} else } else
ath5k_beacon_update_timers(sc, -1); ath5k_beacon_update_timers(sc, -1);