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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 CDABAC4360F for ; Mon, 18 Feb 2019 14:02:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9293A2173C for ; Mon, 18 Feb 2019 14:02:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498530; bh=mtUItnYdoMPJ2isFZzVGav2YxRSY8rNC0jwnyXUG/54=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ESV6VviPHNGK/UYGc6zzTAXt1VAfgQLcSgopFAjFG5fiRLVQ44EfJxlu5aiUFnABd KXW1OLh9MdPDPna8jOf8sX/mFGOuUoLsA512jnm4a1XiZRmEJoEJ+/ugweg5jNJlvO 1+U5sohjqZJyfJsSCxLQ4IhzPrINrtX4eQo0t3As= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389359AbfBROCJ (ORCPT ); Mon, 18 Feb 2019 09:02:09 -0500 Received: from mail.kernel.org ([198.145.29.99]:43646 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389317AbfBROCF (ORCPT ); Mon, 18 Feb 2019 09:02:05 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B7ABA2173C; Mon, 18 Feb 2019 14:02:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498525; bh=mtUItnYdoMPJ2isFZzVGav2YxRSY8rNC0jwnyXUG/54=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wh2SyVyCZSUBazr07OVYYAuIH7S83Fz/BJgpgwMY2zOB6LL66T9f8iBpKWiKtK73j y6j1QjJrT/QP13JASEfhFBo+LZvGbASIOC9AobjJ9+AOFQaiqkPCn5MISE1BKzZaJ7 tFbHDvz2fZRms6oEBh25Hk7u740Bc68a30RqQhRc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Young Xiao , Jens Axboe , Sasha Levin Subject: [PATCH 4.4 019/143] sunvdc: Do not spin in an infinite loop when vio_ldc_send() returns EAGAIN Date: Mon, 18 Feb 2019 14:42:27 +0100 Message-Id: <20190218133529.860260792@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190218133529.099444112@linuxfoundation.org> References: <20190218133529.099444112@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec ] __vdc_tx_trigger should only loop on EAGAIN a finite number of times. See commit adddc32d6fde ("sunvnet: Do not spin in an infinite loop when vio_ldc_send() returns EAGAIN") for detail. Signed-off-by: Young Xiao Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/block/sunvdc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c index 4b911ed96ea3..31219fb9e7f4 100644 --- a/drivers/block/sunvdc.c +++ b/drivers/block/sunvdc.c @@ -40,6 +40,8 @@ MODULE_VERSION(DRV_MODULE_VERSION); #define WAITING_FOR_GEN_CMD 0x04 #define WAITING_FOR_ANY -1 +#define VDC_MAX_RETRIES 10 + static struct workqueue_struct *sunvdc_wq; struct vdc_req_entry { @@ -419,6 +421,7 @@ static int __vdc_tx_trigger(struct vdc_port *port) .end_idx = dr->prod, }; int err, delay; + int retries = 0; hdr.seq = dr->snd_nxt; delay = 1; @@ -431,6 +434,8 @@ static int __vdc_tx_trigger(struct vdc_port *port) udelay(delay); if ((delay <<= 1) > 128) delay = 128; + if (retries++ > VDC_MAX_RETRIES) + break; } while (err == -EAGAIN); if (err == -ENOTCONN) -- 2.19.1