wil6210: relax spinlocks in rx reorder

In the Rx reorder mechanism, nothing is done in the interrupt
context, so there is no need to use 'irq' flavors of spinlock.
Rx done in NAPI context (tasklet), other manipulations - in the
thread context.

Having interrupts enabled makes it better for the OS in general.
Besides, if enslaved under bonding, bridge or team driver, Rx
won't work with interrupts disabled.
Signed-off-by: NVladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/wil6210/debugfs.c

@@ -1258,10 +1258,10 @@ static void wil_print_rxtid(struct seq_file *s, struct wil_tid_ampdu_rx *r)
 }
 
 static int wil_sta_debugfs_show(struct seq_file *s, void *data)
+__acquires(&p->tid_rx_lock) __releases(&p->tid_rx_lock)
 {
 	struct wil6210_priv *wil = s->private;
 	int i, tid;
-	unsigned long flags;
 
 	for (i = 0; i < ARRAY_SIZE(wil->sta); i++) {
 		struct wil_sta_info *p = &wil->sta[i];
@@ -1282,7 +1282,7 @@ static int wil_sta_debugfs_show(struct seq_file *s, void *data)
 			   (p->data_port_open ? " data_port_open" : ""));
 
 		if (p->status == wil_sta_connected) {
-			spin_lock_irqsave(&p->tid_rx_lock, flags);
+			spin_lock_bh(&p->tid_rx_lock);
 			for (tid = 0; tid < WIL_STA_TID_NUM; tid++) {
 				struct wil_tid_ampdu_rx *r = p->tid_rx[tid];
 
@@ -1291,7 +1291,7 @@ static int wil_sta_debugfs_show(struct seq_file *s, void *data)
 					wil_print_rxtid(s, r);
 				}
 			}
-			spin_unlock_irqrestore(&p->tid_rx_lock, flags);
+			spin_unlock_bh(&p->tid_rx_lock);
 		}
 	}
 

drivers/net/wireless/ath/wil6210/main.c

@@ -166,12 +166,14 @@ void wil_memcpy_toio_32(volatile void __iomem *dst, const void *src,
 
 static void wil_disconnect_cid(struct wil6210_priv *wil, int cid,
 			       u16 reason_code, bool from_event)
+__acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
 {
 	uint i;
 	struct net_device *ndev = wil_to_ndev(wil);
 	struct wireless_dev *wdev = wil->wdev;
 	struct wil_sta_info *sta = &wil->sta[cid];
 
+	might_sleep();
 	wil_dbg_misc(wil, "%s(CID %d, status %d)\n", __func__, cid,
 		     sta->status);
 
@@ -194,15 +196,14 @@ static void wil_disconnect_cid(struct wil6210_priv *wil, int cid,
 
 	for (i = 0; i < WIL_STA_TID_NUM; i++) {
 		struct wil_tid_ampdu_rx *r;
-		unsigned long flags;
 
-		spin_lock_irqsave(&sta->tid_rx_lock, flags);
+		spin_lock_bh(&sta->tid_rx_lock);
 
 		r = sta->tid_rx[i];
 		sta->tid_rx[i] = NULL;
 		wil_tid_ampdu_rx_free(wil, r);
 
-		spin_unlock_irqrestore(&sta->tid_rx_lock, flags);
+		spin_unlock_bh(&sta->tid_rx_lock);
 	}
 	for (i = 0; i < ARRAY_SIZE(wil->vring_tx); i++) {
 		if (wil->vring2cid_tid[i][0] == cid)

drivers/net/wireless/ath/wil6210/rx_reorder.c

@@ -89,7 +89,9 @@ static void wil_reorder_release(struct wil6210_priv *wil,
 	}
 }
 
+/* called in NAPI context */
 void wil_rx_reorder(struct wil6210_priv *wil, struct sk_buff *skb)
+__acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
 {
 	struct net_device *ndev = wil_to_ndev(wil);
 	struct vring_rx_desc *d = wil_skb_rxdesc(skb);
@@ -102,7 +104,6 @@ void wil_rx_reorder(struct wil6210_priv *wil, struct sk_buff *skb)
 	struct wil_tid_ampdu_rx *r;
 	u16 hseq;
 	int index;
-	unsigned long flags;
 
 	wil_dbg_txrx(wil, "MID %d CID %d TID %d Seq 0x%03x mcast %01x\n",
 		     mid, cid, tid, seq, mcast);
@@ -112,13 +113,12 @@ void wil_rx_reorder(struct wil6210_priv *wil, struct sk_buff *skb)
 		return;
 	}
 
-	spin_lock_irqsave(&sta->tid_rx_lock, flags);
+	spin_lock(&sta->tid_rx_lock);
 
 	r = sta->tid_rx[tid];
 	if (!r) {
-		spin_unlock_irqrestore(&sta->tid_rx_lock, flags);
 		wil_netif_rx_any(skb, ndev);
-		return;
+		goto out;
 	}
 
 	hseq = r->head_seq_num;
@@ -196,7 +196,7 @@ void wil_rx_reorder(struct wil6210_priv *wil, struct sk_buff *skb)
 	wil_reorder_release(wil, r);
 
 out:
-	spin_unlock_irqrestore(&sta->tid_rx_lock, flags);
+	spin_unlock(&sta->tid_rx_lock);
 }
 
 struct wil_tid_ampdu_rx *wil_tid_ampdu_rx_alloc(struct wil6210_priv *wil,
@@ -276,6 +276,7 @@ int wil_addba_rx_request(struct wil6210_priv *wil, u8 cidxtid,
 
 static void wil_back_rx_handle(struct wil6210_priv *wil,
 			       struct wil_back_rx *req)
+__acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
 {
 	struct wil_sta_info *sta;
 	u8 cid, tid;
@@ -291,9 +292,9 @@ static void wil_back_rx_handle(struct wil6210_priv *wil,
 	u16 agg_timeout = req->ba_timeout;
 	u16 status = WLAN_STATUS_SUCCESS;
 	u16 ssn = req->ba_seq_ctrl >> 4;
-	unsigned long flags;
 	int rc;
 
+	might_sleep();
 	parse_cidxtid(req->cidxtid, &cid, &tid);
 
 	/* sanity checks */
@@ -327,12 +328,12 @@ static void wil_back_rx_handle(struct wil6210_priv *wil,
 		return;
 
 	/* apply */
-	spin_lock_irqsave(&sta->tid_rx_lock, flags);
+	spin_lock_bh(&sta->tid_rx_lock);
 
 	wil_tid_ampdu_rx_free(wil, sta->tid_rx[tid]);
 	sta->tid_rx[tid] = wil_tid_ampdu_rx_alloc(wil, agg_wsize, ssn);
 
-	spin_unlock_irqrestore(&sta->tid_rx_lock, flags);
+	spin_unlock_bh(&sta->tid_rx_lock);
 }
 
 void wil_back_rx_flush(struct wil6210_priv *wil)

drivers/net/wireless/ath/wil6210/wmi.c

@@ -644,14 +644,15 @@ static void wmi_evt_addba_rx_req(struct wil6210_priv *wil, int id, void *d,
 }
 
 static void wmi_evt_delba(struct wil6210_priv *wil, int id, void *d, int len)
+__acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
 {
 	struct wmi_delba_event *evt = d;
 	u8 cid, tid;
 	u16 reason = __le16_to_cpu(evt->reason);
 	struct wil_sta_info *sta;
 	struct wil_tid_ampdu_rx *r;
-	unsigned long flags;
 
+	might_sleep();
 	parse_cidxtid(evt->cidxtid, &cid, &tid);
 	wil_dbg_wmi(wil, "DELBA CID %d TID %d from %s reason %d\n",
 		    cid, tid,
@@ -681,13 +682,13 @@ static void wmi_evt_delba(struct wil6210_priv *wil, int id, void *d, int len)
 
 	sta = &wil->sta[cid];
 
-	spin_lock_irqsave(&sta->tid_rx_lock, flags);
+	spin_lock_bh(&sta->tid_rx_lock);
 
 	r = sta->tid_rx[tid];
 	sta->tid_rx[tid] = NULL;
 	wil_tid_ampdu_rx_free(wil, r);
 
-	spin_unlock_irqrestore(&sta->tid_rx_lock, flags);
+	spin_unlock_bh(&sta->tid_rx_lock);
 }
 
 static const struct {