brcm80211: fmac: use spinlock calls saving irq flags in brcmf_enq_event()

This function is executed within irq context. The call spin_unlock_irq
does enable interrupts which is not desired in the irq context. This patch
replaces them using the spin_loc_irqsave and spin_unlock_irqrestore
functions.
Reviewed-by: NPieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: NKan Yan <kanyan@broadcom.com>
Signed-off-by: NArend van Spriel <arend@broadcom.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c

@@ -3308,6 +3308,7 @@ brcmf_enq_event(struct brcmf_cfg80211_priv *cfg_priv, u32 event,
 {
 	struct brcmf_cfg80211_event_q *e;
 	s32 err = 0;
+	ulong flags;
 
 	e = kzalloc(sizeof(struct brcmf_cfg80211_event_q), GFP_ATOMIC);
 	if (!e)
@@ -3316,9 +3317,9 @@ brcmf_enq_event(struct brcmf_cfg80211_priv *cfg_priv, u32 event,
 	e->etype = event;
 	memcpy(&e->emsg, msg, sizeof(struct brcmf_event_msg));
 
-	spin_lock_irq(&cfg_priv->evt_q_lock);
+	spin_lock_irqsave(&cfg_priv->evt_q_lock, flags);
 	list_add_tail(&e->evt_q_list, &cfg_priv->evt_q_list);
-	spin_unlock_irq(&cfg_priv->evt_q_lock);
+	spin_unlock_irqrestore(&cfg_priv->evt_q_lock, flags);
 
 	return err;
 }