From patchwork Sun Feb 27 13:52:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 12761729 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 8F653C433EF for ; Sun, 27 Feb 2022 13:53:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231322AbiB0Nxz (ORCPT ); Sun, 27 Feb 2022 08:53:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38832 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231292AbiB0Nxg (ORCPT ); Sun, 27 Feb 2022 08:53:36 -0500 Received: from smtp-relay-internal-0.canonical.com (smtp-relay-internal-0.canonical.com [185.125.188.122]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0912613DE6 for ; Sun, 27 Feb 2022 05:52:54 -0800 (PST) Received: from mail-lj1-f200.google.com (mail-lj1-f200.google.com [209.85.208.200]) (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-0.canonical.com (Postfix) with ESMTPS id C27A53FE4B for ; Sun, 27 Feb 2022 13:52:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1645969970; bh=pRyoy0wYqVh1vMWkfgiwvfL+uC0PF+MUz+uOlTyWlM0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=bmjQIlshRYX7a/noV8CXuwmQr+iQeNkMX8KO44k2XcUW4Kpcj2qE9VbI2jCqdXF0X B2RDRMYK0G7jSU0szExlZDsNdWVhpRNr9N2uglursAFzJa4qL6jb2w7bvXseM0q5aI dHbhQHxnvLFzGErVMmmZkoK2OqlyNCzHnaedLVnFUZizwxuH44RA4kNn7FNW9+s+9/ oE0kwEkJpemf07W7OUTCdLw0fjpkUDgIbExJcEzS6X3kFlgMWyYk2J9VD2iyPfspaX PXqWqb3sQWDzlzTYDiLf+8+Dd6PbALusoeHyFvz0NNm7+vu5xl7udXsF4zeYv18dJ3 k8ll90SdNvTjw== Received: by mail-lj1-f200.google.com with SMTP id r27-20020a2e575b000000b002463f43ca0aso4496497ljd.7 for ; Sun, 27 Feb 2022 05:52:50 -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=pRyoy0wYqVh1vMWkfgiwvfL+uC0PF+MUz+uOlTyWlM0=; b=uIVt/45pkmxBbeCnEJ5pnVih+/EpjVV0Vhbhfcx6eAJDc5ev5ja99+KDcKmYZTKDRp ck+KMDXl+qsos0eyhMM7BIae7eTFZtUezhrsOXk8N1iNuIgOYLF4eNBZHJUGr/OJaaTE awXXKzGMUVaRaW1WrOmf/mDcfTztaBJlyvYdtF8p1k+JfCsnjWg4JmoTX2PSodcjp+GI fyCmnQ6o1eZUrj01bsaCUHnQfJh+mn6tA2Mhf87bOEKg2ZRr4pmG3j650nekgQyNWv3Q 8ZVGuvDSz9xm23nCbPVd3bwkc6t4ihjD2NsYi0RYn4wrNPnWViAuKUA2FG9dj/6Z2McY oVRA== X-Gm-Message-State: AOAM530r7QywqG3uQKLJF1OefrugAFDj7jWx4Wb1X0XoQqMuTu7eeF9r HfzGLwGFrApD1dDHuKf2sEAVCCwhC9Zfs7RKSUOgjATFuu/6krXhl9NR+v2eyTFph1tP2Mc8C9d aZu1lWqU82Au0g8gRvTYyPTfAcyzpoByxKJ4Xwg== X-Received: by 2002:a05:6402:1a55:b0:410:a4b4:2a9d with SMTP id bf21-20020a0564021a5500b00410a4b42a9dmr15356226edb.45.1645969957665; Sun, 27 Feb 2022 05:52:37 -0800 (PST) X-Google-Smtp-Source: ABdhPJxMCUVqX+GQTf3SH7q4WKAqDIKbuRWwlLyTqLEz2lVHwA8GB9LJKefEiix56LpqtlrzGflkbw== X-Received: by 2002:a05:6402:1a55:b0:410:a4b4:2a9d with SMTP id bf21-20020a0564021a5500b00410a4b42a9dmr15356182edb.45.1645969957475; Sun, 27 Feb 2022 05:52:37 -0800 (PST) Received: from localhost.localdomain (xdsl-188-155-181-108.adslplus.ch. [188.155.181.108]) by smtp.gmail.com with ESMTPSA id r22-20020a17090638d600b006d584aaa9c9sm3393333ejd.133.2022.02.27.05.52.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Feb 2022 05:52:36 -0800 (PST) From: Krzysztof Kozlowski To: 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 , "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 Cc: Rasmus Villemoes , Krzysztof Kozlowski Subject: [PATCH v3 04/11] hv: Use driver_set_override() instead of open-coding Date: Sun, 27 Feb 2022 14:52:07 +0100 Message-Id: <20220227135214.145599-5-krzysztof.kozlowski@canonical.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220227135214.145599-1-krzysztof.kozlowski@canonical.com> References: <20220227135214.145599-1-krzysztof.kozlowski@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org Use a helper for seting driver_override to reduce amount of duplicated code. Make the driver_override field const char, because it is not modified by the core and it matches other subsystems. Signed-off-by: Krzysztof Kozlowski Reviewed-by: Michael Kelley --- drivers/hv/vmbus_drv.c | 28 ++++------------------------ include/linux/hyperv.h | 7 ++++++- 2 files changed, 10 insertions(+), 25 deletions(-) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 12a2b37e87f3..a0ff4139c3d2 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -575,31 +575,11 @@ static ssize_t driver_override_store(struct device *dev, const char *buf, size_t count) { struct hv_device *hv_dev = device_to_hv_device(dev); - char *driver_override, *old, *cp; - - /* 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 = hv_dev->driver_override; - if (strlen(driver_override)) { - hv_dev->driver_override = driver_override; - } else { - kfree(driver_override); - hv_dev->driver_override = NULL; - } - device_unlock(dev); + int ret; - kfree(old); + ret = driver_set_override(dev, &hv_dev->driver_override, buf, count); + if (ret) + return ret; return count; } diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index fe2e0179ed51..beea11874be2 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1257,7 +1257,12 @@ struct hv_device { u16 device_id; struct device device; - char *driver_override; /* Driver name to force a match */ + /* + * Driver name to force a match. + * Do not set directly, because core frees it. + * Use driver_set_override() to set or clear it. + */ + const char *driver_override; struct vmbus_channel *channel; struct kset *channels_kset;