From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964824AbcFOUIa (ORCPT ); Wed, 15 Jun 2016 16:08:30 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33487 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932879AbcFOUI0 (ORCPT ); Wed, 15 Jun 2016 16:08:26 -0400 Subject: Re: [PATCH V7 8/9] vfio: platform: check reset call return code during open To: Sinan Kaya , kvm@vger.kernel.org, timur@codeaurora.org, cov@codeaurora.org, jcm@redhat.com, alex.williamson@redhat.com, eric.auger@linaro.org References: <1465792001-27960-1-git-send-email-okaya@codeaurora.org> <1465792001-27960-9-git-send-email-okaya@codeaurora.org> Cc: linux-acpi@vger.kernel.org, agross@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Baptiste Reynal , linux-kernel@vger.kernel.org From: Auger Eric Message-ID: Date: Wed, 15 Jun 2016 22:08:19 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0 MIME-Version: 1.0 In-Reply-To: <1465792001-27960-9-git-send-email-okaya@codeaurora.org> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Wed, 15 Jun 2016 20:08:25 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sinan, On 13/06/2016 06:26, Sinan Kaya wrote: > Open 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 abort open if reset fails. > > Signed-off-by: Sinan Kaya > --- > drivers/vfio/platform/vfio_platform_common.c | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c > index d84c399..d3141e7 100644 > --- a/drivers/vfio/platform/vfio_platform_common.c > +++ b/drivers/vfio/platform/vfio_platform_common.c > @@ -264,6 +264,8 @@ static int vfio_platform_open(void *device_data) > mutex_lock(&driver_lock); > > if (!vdev->refcnt) { > + const char *extra_dbg = NULL; > + > ret = vfio_platform_regions_init(vdev); > if (ret) > goto err_reg; > @@ -272,7 +274,12 @@ static int vfio_platform_open(void *device_data) > if (ret) > goto err_irq; > > - vfio_platform_call_reset(vdev, NULL); > + 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 open (%d) %s\n", > + ret, extra_dbg ? extra_dbg : ""); > + goto err_rst; > + } > } > > vdev->refcnt++; > @@ -280,6 +287,8 @@ static int vfio_platform_open(void *device_data) > mutex_unlock(&driver_lock); > return 0; > > +err_rst: > + vfio_platform_irq_cleanup(vdev); > err_irq: > vfio_platform_regions_cleanup(vdev); > err_reg: > Reviewed-by: Eric Auger Thanks Eric