From patchwork Mon Mar 15 13:52:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 401492 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C8D6EC433E6 for ; Mon, 15 Mar 2021 14:00:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9EE6A64F1E for ; Mon, 15 Mar 2021 14:00:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232734AbhCON7h (ORCPT ); Mon, 15 Mar 2021 09:59:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:34900 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232330AbhCON6Y (ORCPT ); Mon, 15 Mar 2021 09:58:24 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8027164F16; Mon, 15 Mar 2021 13:58:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816704; bh=lYI+fxC0x0wtugthTFEwxqBaDX2lnENLz29pCkVtjPY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tilEB6kimJEU3SyDUv+MaQe5tpcZMyq6aKtieC53iEFVNzJdtdw0dlb43bHXxUg5f zhMXDNiCgvXrwqiryq+h2KXSrGbSMuUgru8bTPnbD/b0VnaleG0tMdbdIGDa705n9W X487l5v26OF6WWgClaKqF2qQHv59F6SKUFvz73cc= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Julian Wiedmann , "David S. Miller" Subject: [PATCH 5.11 075/306] s390/qeth: fix notification for pending buffers during teardown Date: Mon, 15 Mar 2021 14:52:18 +0100 Message-Id: <20210315135510.180474061@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135507.611436477@linuxfoundation.org> References: <20210315135507.611436477@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Greg Kroah-Hartman From: Julian Wiedmann commit 7eefda7f353ef86ad82a2dc8329e8a3538c08ab6 upstream. The cited commit reworked the state machine for pending TX buffers. In qeth_iqd_tx_complete() it turned PENDING into a transient state, and uses NEED_QAOB for buffers that get parked while waiting for their QAOB completion. But it missed to adjust the check in qeth_tx_complete_buf(). So if qeth_tx_complete_pending_bufs() is called during teardown to drain the parked TX buffers, we no longer raise a notification for af_iucv. Instead of updating the checked state, just move this code into qeth_tx_complete_pending_bufs() itself. This also gets rid of the special-case in the common TX completion path. Fixes: 8908f36d20d8 ("s390/qeth: fix af_iucv notification race") Signed-off-by: Julian Wiedmann Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/s390/net/qeth_core_main.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -1386,9 +1386,6 @@ static void qeth_tx_complete_buf(struct struct qeth_qdio_out_q *queue = buf->q; struct sk_buff *skb; - if (atomic_read(&buf->state) == QETH_QDIO_BUF_PENDING) - qeth_notify_skbs(queue, buf, TX_NOTIFY_GENERALERROR); - /* Empty buffer? */ if (buf->next_element_to_fill == 0) return; @@ -1461,6 +1458,9 @@ static void qeth_tx_complete_pending_buf QETH_CARD_TEXT(card, 5, "fp"); QETH_CARD_TEXT_(card, 5, "%lx", (long) buf); + if (drain) + qeth_notify_skbs(queue, buf, + TX_NOTIFY_GENERALERROR); qeth_tx_complete_buf(buf, drain, 0); list_del(&buf->list_entry);