From patchwork Sat Mar 12 13:28:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 12778821 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 C1554C3525B for ; Sat, 12 Mar 2022 13:29:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231942AbiCLNav (ORCPT ); Sat, 12 Mar 2022 08:30:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45014 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231908AbiCLNaq (ORCPT ); Sat, 12 Mar 2022 08:30:46 -0500 Received: from smtp-relay-internal-1.canonical.com (smtp-relay-internal-1.canonical.com [185.125.188.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2D6917EDB6 for ; Sat, 12 Mar 2022 05:29:31 -0800 (PST) Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-internal-1.canonical.com (Postfix) with ESMTPS id C79EC40041 for ; Sat, 12 Mar 2022 13:29:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1647091769; bh=k4Jb1JIbmx97RGU5zYwsibslXr/amA0TPgZk/TYiBU0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=NN5ij4r6/uYIXwR5e6+av3PiZPHMJ8UBFM2Lglt8YZESg/qF43b9VCMS2KkMS3Oy6 8l84xfXzAjgPwFmxIfOxx6vKglY9VBA8pITmTs3Tin/hOaLR3RfiSHVfALVzGVd14w 1OQ4SeghpIA1vIIkJlKbm0BJNai07GwL1Z1VdAWI4RzBm7lUwf2PYSqKkYfEer9IUI 3iGoLnFZmdwQY7wiwrFVC9+KqrGAEudQN6/sJUozI/ErWq5wUkckgkXgfUEKakIp6G +19iHOiWI1M2SM6CR8hommML+D8hAuw4e0aMBUPHryIxmja4TaiAn9Ttg0McQIhvBv JWLPsEHsxfGyQ== Received: by mail-wm1-f69.google.com with SMTP id 20-20020a05600c231400b00389886f6b23so4381768wmo.6 for ; Sat, 12 Mar 2022 05:29:29 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=k4Jb1JIbmx97RGU5zYwsibslXr/amA0TPgZk/TYiBU0=; b=6iSK79jgQPRvhv8/R4Nh4305xeeEG3RqJZFPCv8WNClYJALbUZb4DPHtDgUsqyzurV +vzaYCE35lqm3CcdPlj+QvuGTac7arPDecS+ktnb9B2PXLVe0tX/a490y9gT60vw35Mn oP6hPdQM4+ZGtUroSgJU5qV4sTnD3EKlWgLe4DywqErp1iM/Q0p0+hRVJ2sogipXkSeh 4EV/VShX6ZBsGLBwuD/OhjbdUwA+9mvp6aeqsNEaEaxBKUqt7DUkmLrKVgdqEG3KIQ2e U0rAvftGJweEFM442ctETvAE/gDsXZTWBewO2mhl+gjAJchxm51PrcYzmjy2dLZ6dA1m AU8Q== X-Gm-Message-State: AOAM531d0DowCvh0tbskMPuYUXfnGQIVXNVWcmiVKo3KXMfJa/blc88r HEoAShab2WThS79Dh5STqT08GbuY09nE/4wNvOMQHby7EE7r3if7vY6f4oqA+Vn5yia33/L9apT ZGJ17OPX741uHIBuuMschsZ+wLGToPZremIXkZw== X-Received: by 2002:a05:600c:205a:b0:380:d03d:9cd5 with SMTP id p26-20020a05600c205a00b00380d03d9cd5mr18973813wmg.89.1647091769340; Sat, 12 Mar 2022 05:29:29 -0800 (PST) X-Google-Smtp-Source: ABdhPJx/UYRzL44sORF2ylmmKXb7vWoxaA4l4bh2hpunrfXO0ZX4FC17dWpWNzj8sLP8bds5v9sX3A== X-Received: by 2002:a05:600c:205a:b0:380:d03d:9cd5 with SMTP id p26-20020a05600c205a00b00380d03d9cd5mr18973773wmg.89.1647091769175; Sat, 12 Mar 2022 05:29:29 -0800 (PST) Received: from localhost.localdomain (xdsl-188-155-174-239.adslplus.ch. [188.155.174.239]) by smtp.gmail.com with ESMTPSA id p22-20020a1c5456000000b00389e7e62800sm5751550wmi.8.2022.03.12.05.29.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 12 Mar 2022 05:29:28 -0800 (PST) From: Krzysztof Kozlowski To: Greg Kroah-Hartman , "Rafael J. Wysocki" Cc: 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 , "Michael S. Tsirkin" , 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 , Krzysztof Kozlowski Subject: [PATCH v4 08/11] vdpa: Use helper for safer setting of driver_override Date: Sat, 12 Mar 2022 14:28:53 +0100 Message-Id: <20220312132856.65163-9-krzysztof.kozlowski@canonical.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220312132856.65163-1-krzysztof.kozlowski@canonical.com> References: <20220312132856.65163-1-krzysztof.kozlowski@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Use a helper to set driver_override to reduce amount of duplicated code. Signed-off-by: Krzysztof Kozlowski Acked-by: Michael S. Tsirkin 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