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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7463CC4321E for ; Sun, 13 Mar 2022 00:19:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231139AbiCMAUG (ORCPT ); Sat, 12 Mar 2022 19:20:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47886 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232110AbiCMAUF (ORCPT ); Sat, 12 Mar 2022 19:20:05 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 99F4D22B37 for ; Sat, 12 Mar 2022 16:18:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1647130736; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=aU12aXI0nEauDVlqXZUcV1/rWNx8riFMg5QnGWUSeY8=; b=avC/y0665Wx36JYC8DrhqNBdSKx0ySM5D0Oe3jsWuVsOaOfL5a4WR1a8YKYUEhfz5u5f/C EKKIQSa9pOkurvp6LoFp+nHKz/6YMSs/bD+cm2/OG/esc0COWEn5BJDwBq9kuFwXHbWJP1 h56Gs/HRjYgC24UuwEQO/BkrPlT/zE8= Received: from mail-ej1-f70.google.com (mail-ej1-f70.google.com [209.85.218.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-5-HX1D7P-7ORKNY_1zUNoBCg-1; Sat, 12 Mar 2022 19:18:55 -0500 X-MC-Unique: HX1D7P-7ORKNY_1zUNoBCg-1 Received: by mail-ej1-f70.google.com with SMTP id q22-20020a1709064cd600b006db14922f93so6695636ejt.7 for ; Sat, 12 Mar 2022 16:18:55 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=aU12aXI0nEauDVlqXZUcV1/rWNx8riFMg5QnGWUSeY8=; b=iWTO9Mk37LvyfCKhSAeM4RyhOOB9O6RqnR4ET00jtouli+gcrnvGF0TO0cOd8qWB1J gb5MgVpelXnTqQjptAWvyUxbXXe275Binl0HaX0e1TNdvA8jPFOYe45r95tOp8829c6H rEpefydJGNPStDM6wdM+ueXVHls3K2jhCsximunuFEcsW3f5BljdWE+5Y7t4HJxAz0Vp R1I6joNbxtMWiHVrosD/cPW3az7JNonvWWUW2seJrfWmkiId4MtmJB1F67cvRaA+/vgb QJIXvVc/N7OJSyRbHipxCCXAHWdwOFwa99Bz6c/kAsYiYVHzMFGqgXvg1NjQ2k+iz6F7 NzRg== X-Gm-Message-State: AOAM531Fzi7bLzRQcHqcxlmf3S3hnC3wMe5levtJ33ppMyQCObO6u51I UfNkZUPEBCHR3JhWBya04qusnBMKOSfGEoM3LsJ+QsovwolbgkFRQY2anxR9HmNlQeOfaoxn4/V ZsugnyUO+rfzlZkUqlGlD X-Received: by 2002:a17:906:7953:b0:6da:951c:1173 with SMTP id l19-20020a170906795300b006da951c1173mr14006392ejo.465.1647130734297; Sat, 12 Mar 2022 16:18:54 -0800 (PST) X-Google-Smtp-Source: ABdhPJyTW7jukeffXPd44IwM8ULWjAAjUUSeFWDf/jK+F/hKS8czFPnDNsmp7ccs5WfZmNdxPvzdXQ== X-Received: by 2002:a17:906:7953:b0:6da:951c:1173 with SMTP id l19-20020a170906795300b006da951c1173mr14006363ejo.465.1647130734008; Sat, 12 Mar 2022 16:18:54 -0800 (PST) Received: from redhat.com ([2a03:c5c0:207e:97fa:8a98:fc0d:1935:f619]) by smtp.gmail.com with ESMTPSA id j11-20020a05640211cb00b00418572a3638sm2097646edw.38.2022.03.12.16.18.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 12 Mar 2022 16:18:52 -0800 (PST) Date: Sat, 12 Mar 2022 19:18:42 -0500 From: "Michael S. Tsirkin" To: Krzysztof Kozlowski Cc: Greg Kroah-Hartman , "Rafael J. Wysocki" , Stuart Yoder , Laurentiu Tudor , Abel Vesa , Shawn Guo , Sascha Hauer , Fabio Estevam , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Bjorn Helgaas , Bjorn Andersson , Mathieu Poirier , Vineeth Vijayan , Peter Oberparleiter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Andy Gross , Srinivas Kandagatla , Mark Brown , Jason Wang , linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, NXP Linux Team , linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-spi@vger.kernel.org, virtualization@lists.linux-foundation.org, Linus Torvalds , Rasmus Villemoes Subject: Re: [PATCH v4 08/11] vdpa: Use helper for safer setting of driver_override Message-ID: <20220312191834-mutt-send-email-mst@kernel.org> References: <20220312132856.65163-1-krzysztof.kozlowski@canonical.com> <20220312132856.65163-9-krzysztof.kozlowski@canonical.com> MIME-Version: 1.0 In-Reply-To: <20220312132856.65163-9-krzysztof.kozlowski@canonical.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org On Sat, Mar 12, 2022 at 02:28:53PM +0100, Krzysztof Kozlowski wrote: > Use a helper to set driver_override to reduce amount of duplicated code. > > Signed-off-by: Krzysztof Kozlowski Acked-by: Michael S. Tsirkin > --- > drivers/vdpa/vdpa.c | 29 ++++------------------------- > include/linux/vdpa.h | 4 +++- > 2 files changed, 7 insertions(+), 26 deletions(-) > > diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c > index 1ea525433a5c..2dabed1df35c 100644 > --- a/drivers/vdpa/vdpa.c > +++ b/drivers/vdpa/vdpa.c > @@ -77,32 +77,11 @@ static ssize_t driver_override_store(struct device *dev, > const char *buf, size_t count) > { > struct vdpa_device *vdev = dev_to_vdpa(dev); > - const char *driver_override, *old; > - char *cp; > + int ret; > > - /* We need to keep extra room for a newline */ > - if (count >= (PAGE_SIZE - 1)) > - return -EINVAL; > - > - driver_override = kstrndup(buf, count, GFP_KERNEL); > - if (!driver_override) > - return -ENOMEM; > - > - cp = strchr(driver_override, '\n'); > - if (cp) > - *cp = '\0'; > - > - device_lock(dev); > - old = vdev->driver_override; > - if (strlen(driver_override)) { > - vdev->driver_override = driver_override; > - } else { > - kfree(driver_override); > - vdev->driver_override = NULL; > - } > - device_unlock(dev); > - > - kfree(old); > + ret = driver_set_override(dev, &vdev->driver_override, buf, count); > + if (ret) > + return ret; > > return count; > } > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h > index 721089bb4c84..37117404660e 100644 > --- a/include/linux/vdpa.h > +++ b/include/linux/vdpa.h > @@ -64,7 +64,9 @@ struct vdpa_mgmt_dev; > * struct vdpa_device - representation of a vDPA device > * @dev: underlying device > * @dma_dev: the actual device that is performing DMA > - * @driver_override: driver name to force a match > + * @driver_override: driver name to force a match; do not set directly, > + * because core frees it; use driver_set_override() to > + * set or clear it. > * @config: the configuration ops for this device. > * @cf_mutex: Protects get and set access to configuration layout. > * @index: device index > -- > 2.32.0