From nobody Sat Feb 7 20:40:34 2026 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 5C22DEB64DA for ; Tue, 11 Jul 2023 01:09:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231139AbjGKBJD (ORCPT ); Mon, 10 Jul 2023 21:09:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231177AbjGKBI5 (ORCPT ); Mon, 10 Jul 2023 21:08:57 -0400 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 28E53E7A; Mon, 10 Jul 2023 18:08:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1689037732; x=1720573732; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=KFCYwINW+Ez0BStnuTZ0pJyGBX2+iWULH1gI+15dKZA=; b=LE66WEKzBF8h3unZK8MDTnJNOaX/dldl+D9mnLaD8yCKfAguGYSsSON3 qO1dcMqbF7xpZM7JJD3S/3FRetiGiwWg/r8pk3zp2OfoeBYjD6tTvp6I7 2blXtFEc55iWRW42iHLrNCIFdZi/9AQ4kFHNsKCjJ5d1fZRSFux5li6L8 p6+s6w5l+rLNgSbLTT+J2AhUpDVs/r2uK1H63vq4WRnNNrewMt1flvKXc RcRktOigxJ+GMPxIbTDlTcB1kxBDTbCfHAlBJeA6Q2L+Uzh3O+w2COXvr 5dGSDrYHcQXHYra9YS1rWSfMbpI04pNvBHqlnUzIi8G5+GUPGeOiVm6l6 g==; X-IronPort-AV: E=McAfee;i="6600,9927,10767"; a="344816099" X-IronPort-AV: E=Sophos;i="6.01,195,1684825200"; d="scan'208";a="344816099" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Jul 2023 18:08:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10767"; a="810999867" X-IronPort-AV: E=Sophos;i="6.01,195,1684825200"; d="scan'208";a="810999867" Received: from allen-box.sh.intel.com ([10.239.159.127]) by FMSMGA003.fm.intel.com with ESMTP; 10 Jul 2023 18:08:48 -0700 From: Lu Baolu To: Joerg Roedel , Will Deacon , Robin Murphy , Jason Gunthorpe , Kevin Tian , Jean-Philippe Brucker , Nicolin Chen Cc: Yi Liu , Jacob Pan , iommu@lists.linux.dev, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH 4/9] iommu: Change the return value of dev_iommu_get() Date: Tue, 11 Jul 2023 09:06:37 +0800 Message-Id: <20230711010642.19707-5-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230711010642.19707-1-baolu.lu@linux.intel.com> References: <20230711010642.19707-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Make dev_iommu_get() return 0 for success and error numbers for failure. This will make the code neat and readable. No functionality changes. Signed-off-by: Lu Baolu Reviewed-by: Jacob Pan --- drivers/iommu/iommu.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 41328f03e8b4..65895b987e22 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -287,20 +287,20 @@ void iommu_device_unregister(struct iommu_device *iom= mu) } EXPORT_SYMBOL_GPL(iommu_device_unregister); =20 -static struct dev_iommu *dev_iommu_get(struct device *dev) +static int dev_iommu_get(struct device *dev) { struct dev_iommu *param =3D dev->iommu; =20 if (param) - return param; + return 0; =20 param =3D kzalloc(sizeof(*param), GFP_KERNEL); if (!param) - return NULL; + return -ENOMEM; =20 mutex_init(¶m->lock); dev->iommu =3D param; - return param; + return 0; } =20 static void dev_iommu_free(struct device *dev) @@ -351,10 +351,9 @@ static int __iommu_probe_device(struct device *dev, st= ruct list_head *group_list * but for now enforcing a simple global ordering is fine. */ mutex_lock(&iommu_probe_device_lock); - if (!dev_iommu_get(dev)) { - ret =3D -ENOMEM; + ret =3D dev_iommu_get(dev); + if (ret) goto err_unlock; - } =20 if (!try_module_get(ops->owner)) { ret =3D -EINVAL; @@ -2751,12 +2750,14 @@ int iommu_fwspec_init(struct device *dev, struct fw= node_handle *iommu_fwnode, const struct iommu_ops *ops) { struct iommu_fwspec *fwspec =3D dev_iommu_fwspec_get(dev); + int ret; =20 if (fwspec) return ops =3D=3D fwspec->ops ? 0 : -EINVAL; =20 - if (!dev_iommu_get(dev)) - return -ENOMEM; + ret =3D dev_iommu_get(dev); + if (ret) + return ret; =20 /* Preallocate for the overwhelmingly common case of 1 ID */ fwspec =3D kzalloc(struct_size(fwspec, ids, 1), GFP_KERNEL); --=20 2.34.1