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 C98BFC433F5 for ; Tue, 16 Nov 2021 01:23:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B52756120E for ; Tue, 16 Nov 2021 01:23:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352709AbhKPB0r (ORCPT ); Mon, 15 Nov 2021 20:26:47 -0500 Received: from mail.kernel.org ([198.145.29.99]:35154 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243471AbhKOTCt (ORCPT ); Mon, 15 Nov 2021 14:02:49 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 309096336B; Mon, 15 Nov 2021 18:15:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637000111; bh=R6kfVtPZtZiUAOQg6evUy+5HJ6MonfkON/BkmlPZv34=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LNnrw/1OpmVXLwiuTaHG8eb+wTP9kLnMYlS0y2xcVsHPJSa8C6zVtdFqJ5EdATuif O3Ay+rAKwmx/hQ+tErrXUqCpGLvb9PoDv5W+s4jQ8JLrpI1oS2J++FQ/KkaPECvp5G Re9sD5Zs1d2p9ig0bdo3+0C0os693HhDhH3p+6ZA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Abdul Haleem , Vaishnavi Bhat , Sukadev Bhattiprolu , Dany Madden , "David S. Miller" , Sasha Levin Subject: [PATCH 5.14 542/849] ibmvnic: dont stop queue in xmit Date: Mon, 15 Nov 2021 18:00:25 +0100 Message-Id: <20211115165438.593878123@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165419.961798833@linuxfoundation.org> References: <20211115165419.961798833@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: stable@vger.kernel.org From: Sukadev Bhattiprolu [ Upstream commit 8878e46fcfd46b19964bd90e13b25dd94cbfc9be ] If adapter's resetting bit is on, discard the packet but don't stop the transmit queue - instead leave that to the reset code. With this change, it is possible that we may get several calls to ibmvnic_xmit() that simply discard packets and return. But if we stop the queue here, we might end up doing so just after __ibmvnic_open() started the queues (during a hard/soft reset) and before the ->resetting bit was cleared. If that happens, there will be no one to restart queue and transmissions will be blocked indefinitely. This can cause a TIMEOUT reset and with auto priority failover enabled, an unnecessary FAILOVER reset to less favored backing device and then a FAILOVER back to the most favored backing device. If we hit the window repeatedly, we can get stuck in a loop of TIMEOUT, FAILOVER, FAILOVER resets leaving the adapter unusable for extended periods of time. Fixes: 7f5b030830fe ("ibmvnic: Free skb's in cases of failure in transmit") Reported-by: Abdul Haleem Reported-by: Vaishnavi Bhat Signed-off-by: Sukadev Bhattiprolu Reviewed-by: Dany Madden Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/ibm/ibmvnic.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 6aa6ff89a7651..7438138c3766a 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -1724,8 +1724,6 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev) ind_bufp = &tx_scrq->ind_buf; if (test_bit(0, &adapter->resetting)) { - if (!netif_subqueue_stopped(netdev, skb)) - netif_stop_subqueue(netdev, queue_num); dev_kfree_skb_any(skb); tx_send_failed++; -- 2.33.0