From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B7A2EC4321E for ; Mon, 15 Nov 2021 23:36:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A34B361A40 for ; Mon, 15 Nov 2021 23:36:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354898AbhKOXih (ORCPT ); Mon, 15 Nov 2021 18:38:37 -0500 Received: from mail.kernel.org ([198.145.29.99]:44598 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343615AbhKOTV0 (ORCPT ); Mon, 15 Nov 2021 14:21:26 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id B917C63359; Mon, 15 Nov 2021 18:43:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637001794; bh=qW0+ciLKICxRFTUUvwKGjn0YuLe3wzG3Ivp3GXnSLoo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UUG15dTXrQh3SGpAh4ztTBDy0wgs8EcnsfpqnFASHkvy1mZx+aQLzgitiYK09UyxL sTv9C8dpQjTM3Rj61EdK7K9rArt0l0W/xrDchvwjQryFwedasdgpKEKR/uc7kXDENW tbA3fyhJeCjQNUPoDHLoqomonriFDe+fhET236EQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Loic Poulain , Bryan ODonoghue , Kalle Valo , Sasha Levin Subject: [PATCH 5.15 306/917] wcn36xx: Fix packet drop on resume Date: Mon, 15 Nov 2021 17:56:41 +0100 Message-Id: <20211115165439.136835165@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165428.722074685@linuxfoundation.org> References: <20211115165428.722074685@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Loic Poulain [ Upstream commit df0697801d8aa2eebfe7f0b7388879639f8fe7cc ] If the system is resumed because of an incoming packet, the wcn36xx RX interrupts is fired before actual resuming of the wireless/mac80211 stack, causing any received packets to be simply dropped. E.g. a ping request causes a system resume, but is dropped and so never forwarded to the IP stack. This change fixes that, disabling DMA interrupts on suspend to no pass packets until mac80211 is resumed and ready to handle them. Note that it's not incompatible with RX irq wake. Signed-off-by: Loic Poulain Reviewed-by: Bryan O'Donoghue Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/1635150496-19290-1-git-send-email-loic.poulain@linaro.org Signed-off-by: Sasha Levin --- drivers/net/wireless/ath/wcn36xx/main.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c index bd1c83aeea606..39d86e3031bd7 100644 --- a/drivers/net/wireless/ath/wcn36xx/main.c +++ b/drivers/net/wireless/ath/wcn36xx/main.c @@ -1115,6 +1115,13 @@ static int wcn36xx_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wow) goto out; ret = wcn36xx_smd_wlan_host_suspend_ind(wcn); } + + /* Disable IRQ, we don't want to handle any packet before mac80211 is + * resumed and ready to receive packets. + */ + disable_irq(wcn->tx_irq); + disable_irq(wcn->rx_irq); + out: mutex_unlock(&wcn->conf_mutex); return ret; @@ -1137,6 +1144,10 @@ static int wcn36xx_resume(struct ieee80211_hw *hw) wcn36xx_smd_ipv6_ns_offload(wcn, vif, false); wcn36xx_smd_arp_offload(wcn, vif, false); } + + enable_irq(wcn->tx_irq); + enable_irq(wcn->rx_irq); + mutex_unlock(&wcn->conf_mutex); return 0; -- 2.33.0