From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-gw1-out.broadcom.com ([216.31.210.62]:26870 "EHLO mail-gw1-out.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752527AbbHTUGa (ORCPT ); Thu, 20 Aug 2015 16:06:30 -0400 From: Arend van Spriel To: Kalle Valo CC: linux-wireless , Franky Lin , Arend van Spriel Subject: [PATCH V3 4/6] brcmfmac: block the correct flowring when backup queue overflow Date: Thu, 20 Aug 2015 22:06:06 +0200 Message-ID: <1440101168-2252-5-git-send-email-arend@broadcom.com> (sfid-20150820_220632_937532_E1A2D062) In-Reply-To: <1440101168-2252-1-git-send-email-arend@broadcom.com> References: <1440101168-2252-1-git-send-email-arend@broadcom.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Franky Lin 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 Reviewed-by: Hante Meuleman Signed-off-by: Franky Lin Signed-off-by: Arend van Spriel --- drivers/net/wireless/brcm80211/brcmfmac/flowring.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) 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; } -- 1.9.1