diff mbox

[V3,4/6] brcmfmac: block the correct flowring when backup queue overflow

Message ID 1440101168-2252-5-git-send-email-arend@broadcom.com (mailing list archive)
State Accepted
Delegated to: Kalle Valo
Headers show

Commit Message

Arend van Spriel Aug. 20, 2015, 8:06 p.m. UTC 
From: Franky Lin <frankyl@broadcom.com>

brcmf_flowring_block blocks the last active flowring under the same
interface instead of the one provided by caller. This could lead to a
dead lock of netif stop if there are more than one flowring under the
interface and the traffic is high enough so brcmf_flowring_enqueue can
not unblock the ring right away.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
---
 drivers/net/wireless/brcm80211/brcmfmac/flowring.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
diff mbox

Patch

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/flowring.c b/drivers/net/wireless/brcm80211/brcmfmac/flowring.c
index 5944063..8d1ab4a 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/flowring.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/flowring.c
@@ -194,11 +194,15 @@  static void brcmf_flowring_block(struct brcmf_flowring *flow, u8 flowid,
 	spin_lock_irqsave(&flow->block_lock, flags);
 
 	ring = flow->rings[flowid];
+	if (ring->blocked == blocked) {
+		spin_unlock_irqrestore(&flow->block_lock, flags);
+		return;
+	}
 	ifidx = brcmf_flowring_ifidx_get(flow, flowid);
 
 	currently_blocked = false;
 	for (i = 0; i < flow->nrofrings; i++) {
-		if (flow->rings[i]) {
+		if ((flow->rings[i]) && (i != flowid)) {
 			ring = flow->rings[i];
 			if ((ring->status == RING_OPEN) &&
 			    (brcmf_flowring_ifidx_get(flow, i) == ifidx)) {
@@ -209,8 +213,8 @@  static void brcmf_flowring_block(struct brcmf_flowring *flow, u8 flowid,
 			}
 		}
 	}
-	ring->blocked = blocked;
-	if (currently_blocked == blocked) {
+	flow->rings[flowid]->blocked = blocked;
+	if (currently_blocked) {
 		spin_unlock_irqrestore(&flow->block_lock, flags);
 		return;
 	}