From patchwork Wed May 16 05:43:44 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 914190 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=lists.infradead.org (client-ip=2607:7c80:54:e::133; helo=bombadil.infradead.org; envelope-from=linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="tAePi9e/"; dkim-atps=neutral Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40m3f83NgDz9s19 for ; Wed, 16 May 2018 15:58:56 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=SmNFRP7NPLGJeV5zIMv+zPlqOpX/xiRVo+hTqq8c/lU=; b=tAePi9e/3D8AygW0GAnBnOLj7l hynKPvOVxXibWPU9U6NBnNtGkmBwJxku0mKbo3VjC0kuw//KL6wE/FlTvEE9OBg7i+q/ZygUkPQGE FEgtrpvktw6b9Nc/WVK70Sah7ge/99DLFevXMCt47hAhgW6nbClEPofJTakvryRfjZsfFR2XJ2+d1 6ZZqjXJoSs1Rgl8CpQ95sVIv1XB2AVSjNlmBFWfyXufoDZneWZZXBsNmZnR5yAGJaW6CH5+aAMRQp tdh/iIxR8NNZkHnmhu1acGe9RWZpmKiY2bO/ndP4DrLncMuwKOjlG1jPtTc9t8/t4fzaiIX5vFVFL q+3QiVGg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fIpSQ-0002wR-80; Wed, 16 May 2018 05:58:38 +0000 Received: from [93.83.86.253] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fIpEf-0008Bu-UZ; Wed, 16 May 2018 05:44:26 +0000 From: Christoph Hellwig To: Souptick Joarder , Matthew Wilcox Subject: [PATCH 10/14] vgem: separate errno from VM_FAULT_* values Date: Wed, 16 May 2018 07:43:44 +0200 Message-Id: <20180516054348.15950-11-hch@lst.de> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180516054348.15950-1-hch@lst.de> References: <20180516054348.15950-1-hch@lst.de> X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, ocfs2-devel@oss.oracle.com, devel@lists.orangefs.org, linux-fsdevel@vger.kernel.org, linux-mtd@lists.infradead.org, ceph-devel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, lustre-devel@lists.lustre.org MIME-Version: 1.0 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org And streamline the code in vgem_fault with early returns so that it is a little bit more readable. Signed-off-by: Christoph Hellwig Reviewed-by: Daniel Vetter --- drivers/gpu/drm/vgem/vgem_drv.c | 51 +++++++++++++++------------------ 1 file changed, 23 insertions(+), 28 deletions(-) diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c index 2524ff116f00..a261e0aab83a 100644 --- a/drivers/gpu/drm/vgem/vgem_drv.c +++ b/drivers/gpu/drm/vgem/vgem_drv.c @@ -61,12 +61,13 @@ static void vgem_gem_free_object(struct drm_gem_object *obj) kfree(vgem_obj); } -static int vgem_gem_fault(struct vm_fault *vmf) +static vm_fault_t vgem_gem_fault(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; struct drm_vgem_gem_object *obj = vma->vm_private_data; /* We don't use vmf->pgoff since that has the fake offset */ unsigned long vaddr = vmf->address; + struct page *page; int ret; loff_t num_pages; pgoff_t page_offset; @@ -85,35 +86,29 @@ static int vgem_gem_fault(struct vm_fault *vmf) ret = 0; } mutex_unlock(&obj->pages_lock); - if (ret) { - struct page *page; - - page = shmem_read_mapping_page( - file_inode(obj->base.filp)->i_mapping, - page_offset); - if (!IS_ERR(page)) { - vmf->page = page; - ret = 0; - } else switch (PTR_ERR(page)) { - case -ENOSPC: - case -ENOMEM: - ret = VM_FAULT_OOM; - break; - case -EBUSY: - ret = VM_FAULT_RETRY; - break; - case -EFAULT: - case -EINVAL: - ret = VM_FAULT_SIGBUS; - break; - default: - WARN_ON(PTR_ERR(page)); - ret = VM_FAULT_SIGBUS; - break; - } + if (!ret) + return 0; + + page = shmem_read_mapping_page(file_inode(obj->base.filp)->i_mapping, + page_offset); + if (!IS_ERR(page)) { + vmf->page = page; + return 0; + } + switch (PTR_ERR(page)) { + case -ENOSPC: + case -ENOMEM: + return VM_FAULT_OOM; + case -EBUSY: + return VM_FAULT_RETRY; + case -EFAULT: + case -EINVAL: + return VM_FAULT_SIGBUS; + default: + WARN_ON(PTR_ERR(page)); + return VM_FAULT_SIGBUS; } - return ret; } static const struct vm_operations_struct vgem_gem_vm_ops = {