From patchwork Sat May 28 22:01:18 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sinan Kaya X-Patchwork-Id: 9139609 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3C65A60759 for ; Sat, 28 May 2016 22:05:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2D2251FF27 for ; Sat, 28 May 2016 22:05:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1FE5C27F17; Sat, 28 May 2016 22:05:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id DBCC61FF27 for ; Sat, 28 May 2016 22:05:12 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1b6mJj-0007gB-6C; Sat, 28 May 2016 22:02:47 +0000 Received: from smtp.codeaurora.org ([198.145.29.96]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1b6mJ3-00075r-9n for linux-arm-kernel@lists.infradead.org; Sat, 28 May 2016 22:02:06 +0000 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 63122613DD; Sat, 28 May 2016 22:01:39 +0000 (UTC) Received: from drakthul.qualcomm.com (global_nat1_iad_fw.qualcomm.com [129.46.232.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: okaya@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id BDA85613D3; Sat, 28 May 2016 22:01:36 +0000 (UTC) From: Sinan Kaya To: kvm@vger.kernel.org, timur@codeaurora.org, cov@codeaurora.org, jcm@redhat.com, eric.auger@linaro.org Subject: [PATCH V6 8/8] vfio: platform: check reset call return code during release Date: Sat, 28 May 2016 18:01:18 -0400 Message-Id: <1464472878-27176-9-git-send-email-okaya@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1464472878-27176-1-git-send-email-okaya@codeaurora.org> References: <1464472878-27176-1-git-send-email-okaya@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160528_150205_565855_2CDA40E2 X-CRM114-Status: GOOD ( 12.88 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Baptiste Reynal , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Sinan Kaya , linux-acpi@vger.kernel.org, Alex Williamson , agross@codeaurora.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Release call is ignoring the return code from reset call and can potentially continue even though reset call failed. If reset_required module parameter is set, this patch is going to validate the return code and will cause stack dump with WARN_ON and warn the user of failure. Signed-off-by: Sinan Kaya Reviewed-by: Eric Auger --- drivers/vfio/platform/vfio_platform_common.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c index 962cfb1..bb05ca0 100644 --- a/drivers/vfio/platform/vfio_platform_common.c +++ b/drivers/vfio/platform/vfio_platform_common.c @@ -243,7 +243,15 @@ static void vfio_platform_release(void *device_data) mutex_lock(&driver_lock); if (!(--vdev->refcnt)) { - vfio_platform_call_reset(vdev, NULL); + const char *extra_dbg = NULL; + int ret; + + ret = vfio_platform_call_reset(vdev, &extra_dbg); + if (ret && vdev->reset_required) { + dev_warn(vdev->device, "reset driver is required and reset call failed in release (%d) %s\n", + ret, extra_dbg ? extra_dbg : ""); + WARN_ON(1); + } vfio_platform_regions_cleanup(vdev); vfio_platform_irq_cleanup(vdev); }