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,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,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 ABBFAC282C8 for ; Mon, 28 Jan 2019 16:21:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7537221738 for ; Mon, 28 Jan 2019 16:21:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548692469; bh=rweGVdjjCO3pjg5dJA/8j9YcEDFWMo+mtC/L4LKw5kU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GrZehqBUdqfMboZWPupWt8YDqPsOkcDcowetonyfdkSBv5wSFDzuGW1zyc+dXglcp Rb4FyfmnJLa7WX0Ym6NtO85lhxBt1Y5GvCjmAKndrRmhY5nahFT/vzU5lVtlso8BZm E3iEmjm6j8ZGreVj0d2G1kPaZNCPhpBz1BoHL0Ug= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388957AbfA1QVH (ORCPT ); Mon, 28 Jan 2019 11:21:07 -0500 Received: from mail.kernel.org ([198.145.29.99]:56756 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388944AbfA1QVD (ORCPT ); Mon, 28 Jan 2019 11:21:03 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (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 0DE2F2171F; Mon, 28 Jan 2019 16:21:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548692462; bh=rweGVdjjCO3pjg5dJA/8j9YcEDFWMo+mtC/L4LKw5kU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H8lR0G02AFaeNoLvACTaKJL8DHpvQGOtKM6Z5BQvOkarWsakX2bjrMZh7Es5H2nRG hPJRZrQga83L6YpgrF9UHT2S31Z7AGRIdsEeYIdF4xwIR6E+UyOR8tCwM6oKv3Mn9L sxbb9SSkSduHe0Mvm8Yqgq2lAU0EFDIC6ja6s/iM= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Young Xiao , Jens Axboe , Sasha Levin , linux-block@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 029/107] sunvdc: Do not spin in an infinite loop when vio_ldc_send() returns EAGAIN Date: Mon, 28 Jan 2019 11:18:29 -0500 Message-Id: <20190128161947.57405-29-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190128161947.57405-1-sashal@kernel.org> References: <20190128161947.57405-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Young Xiao [ 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 cab157331c4e..c6d43a2a807d 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