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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 1BB5FC76191 for ; Mon, 15 Jul 2019 13:51:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DC5522086C for ; Mon, 15 Jul 2019 13:51:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563198668; bh=0jxzida8Nrq1/xjaMQLT+q8JO8kBcnfMpyXemMAAhmM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2mMIOLPHYQb9Fn20CXnfNXEBnFLOUC+LLKC94lmGPFAQO0P0WaWka8fj3GEjvlzmJ q7A8Ryia1YP0DFgHCmN7o7DSfigsCY+ngdLXHMk54tMcHHYPE63pA4nOkYRz6eqlcb dPhrsFNnxFfba6KepS35yN/v6luNZRChbJ/LvhLg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731621AbfGONvG (ORCPT ); Mon, 15 Jul 2019 09:51:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:41706 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731803AbfGONvE (ORCPT ); Mon, 15 Jul 2019 09:51:04 -0400 Received: from sasha-vm.mshome.net (unknown [73.61.17.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8FA5B2081C; Mon, 15 Jul 2019 13:51:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563198663; bh=0jxzida8Nrq1/xjaMQLT+q8JO8kBcnfMpyXemMAAhmM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UhQd3DK0tmmAe/0Z/qsd8PSe9MgjCSccbgXZOVzoiWy4J/EZ40r3eHbwxgkffo7vz SdYUW5zl7kFETjKcOfc9y9jOo8uZnssI1k501TixLuabA/FOhR3huCJZWyYXtpdXcT Dh8K17pCHN/xTbe64FoQ7KNeSDhXdOnwk6LShpqc= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Julian Wiedmann , Heiko Carstens , Sasha Levin , linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 5.2 077/249] s390/qdio: handle PENDING state for QEBSM devices Date: Mon, 15 Jul 2019 09:44:02 -0400 Message-Id: <20190715134655.4076-77-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190715134655.4076-1-sashal@kernel.org> References: <20190715134655.4076-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Julian Wiedmann [ Upstream commit 04310324c6f482921c071444833e70fe861b73d9 ] When a CQ-enabled device uses QEBSM for SBAL state inspection, get_buf_states() can return the PENDING state for an Output Queue. get_outbound_buffer_frontier() isn't prepared for this, and any PENDING buffer will permanently stall all further completion processing on this Queue. This isn't a concern for non-QEBSM devices, as get_buf_states() for such devices will manually turn PENDING buffers into EMPTY ones. Fixes: 104ea556ee7f ("qdio: support asynchronous delivery of storage blocks") Signed-off-by: Julian Wiedmann Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin --- drivers/s390/cio/qdio_main.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index 7b7620de2acd..730c4e68094b 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -736,6 +736,7 @@ static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start) switch (state) { case SLSB_P_OUTPUT_EMPTY: + case SLSB_P_OUTPUT_PENDING: /* the adapter got it */ DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count); -- 2.20.1