From patchwork Tue Dec 17 12:53:32 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Vaussard X-Patchwork-Id: 3361941 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id AC3C6C0D4A for ; Tue, 17 Dec 2013 14:12:27 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7B6352034D for ; Tue, 17 Dec 2013 14:12:26 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4127520364 for ; Tue, 17 Dec 2013 14:12:21 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VsuCa-0002BI-6q; Tue, 17 Dec 2013 12:56:45 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VsuBq-0003bv-8e; Tue, 17 Dec 2013 12:55:58 +0000 Received: from slb-mail5.epfl.ch ([2001:620:618:1e0:1:80b2:e034:1] helo=smtp5.epfl.ch) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VsuAY-0003S4-Gw for linux-arm-kernel@lists.infradead.org; Tue, 17 Dec 2013 12:54:45 +0000 Received: (qmail 14726 invoked by uid 107); 17 Dec 2013 12:54:08 -0000 X-Virus-Scanned: ClamAV Received: from lsro1pc340.epfl.ch (HELO lsro1pc340.epfl.ch) (128.178.145.154) (authenticated) by smtp5.epfl.ch (AngelmatoPhylax SMTP proxy) with ESMTPSA; Tue, 17 Dec 2013 13:54:09 +0100 From: Florian Vaussard To: Joerg Roedel , Tony Lindgren , =?UTF-8?q?Beno=C3=AEt=20Cousson?= Subject: [PATCH 1/7] iommu/omap: Do bus_set_iommu() only if probe() succeeds Date: Tue, 17 Dec 2013 13:53:32 +0100 Message-Id: <1387284818-28739-2-git-send-email-florian.vaussard@epfl.ch> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1387284818-28739-1-git-send-email-florian.vaussard@epfl.ch> References: <1387284818-28739-1-git-send-email-florian.vaussard@epfl.ch> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131217_075438_994473_5BFC0AC7 X-CRM114-Status: GOOD ( 14.34 ) X-Spam-Score: -2.4 (--) Cc: Mark Rutland , devicetree@vger.kernel.org, Pawel Moll , Ian Campbell , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Rob Herring , iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, Rob Landley , Kumar Gala , Grant Likely , linux-omap@vger.kernel.org, Florian Vaussard , Hiroshi Doyu X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently, bus_set_iommu() is done in omap_iommu_init(). However, omap_iommu_probe() can fail in a number of ways, leaving the platform bus with a dangling reference to a non-initialized iommu. Perform bus_set_iommu() only if omap_iommu_probe() succeed. Signed-off-by: Florian Vaussard --- drivers/iommu/omap-iommu.c | 207 +++++++++++++++++++++++---------------------- 1 file changed, 104 insertions(+), 103 deletions(-) diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index bcd78a7..ee83bcc 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -930,107 +930,6 @@ static void omap_iommu_detach(struct omap_iommu *obj) dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name); } -/* - * OMAP Device MMU(IOMMU) detection - */ -static int omap_iommu_probe(struct platform_device *pdev) -{ - int err = -ENODEV; - int irq; - struct omap_iommu *obj; - struct resource *res; - struct iommu_platform_data *pdata = pdev->dev.platform_data; - - obj = kzalloc(sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL); - if (!obj) - return -ENOMEM; - - obj->nr_tlb_entries = pdata->nr_tlb_entries; - obj->name = pdata->name; - obj->dev = &pdev->dev; - obj->ctx = (void *)obj + sizeof(*obj); - obj->da_start = pdata->da_start; - obj->da_end = pdata->da_end; - - spin_lock_init(&obj->iommu_lock); - mutex_init(&obj->mmap_lock); - spin_lock_init(&obj->page_table_lock); - INIT_LIST_HEAD(&obj->mmap); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - err = -ENODEV; - goto err_mem; - } - - res = request_mem_region(res->start, resource_size(res), - dev_name(&pdev->dev)); - if (!res) { - err = -EIO; - goto err_mem; - } - - obj->regbase = ioremap(res->start, resource_size(res)); - if (!obj->regbase) { - err = -ENOMEM; - goto err_ioremap; - } - - irq = platform_get_irq(pdev, 0); - if (irq < 0) { - err = -ENODEV; - goto err_irq; - } - err = request_irq(irq, iommu_fault_handler, IRQF_SHARED, - dev_name(&pdev->dev), obj); - if (err < 0) - goto err_irq; - platform_set_drvdata(pdev, obj); - - pm_runtime_irq_safe(obj->dev); - pm_runtime_enable(obj->dev); - - dev_info(&pdev->dev, "%s registered\n", obj->name); - return 0; - -err_irq: - iounmap(obj->regbase); -err_ioremap: - release_mem_region(res->start, resource_size(res)); -err_mem: - kfree(obj); - return err; -} - -static int omap_iommu_remove(struct platform_device *pdev) -{ - int irq; - struct resource *res; - struct omap_iommu *obj = platform_get_drvdata(pdev); - - iopgtable_clear_entry_all(obj); - - irq = platform_get_irq(pdev, 0); - free_irq(irq, obj); - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - release_mem_region(res->start, resource_size(res)); - iounmap(obj->regbase); - - pm_runtime_disable(obj->dev); - - dev_info(&pdev->dev, "%s removed\n", obj->name); - kfree(obj); - return 0; -} - -static struct platform_driver omap_iommu_driver = { - .probe = omap_iommu_probe, - .remove = omap_iommu_remove, - .driver = { - .name = "omap-iommu", - }, -}; - static void iopte_cachep_ctor(void *iopte) { clean_dcache_area(iopte, IOPTE_TABLE_SIZE); @@ -1265,6 +1164,110 @@ static struct iommu_ops omap_iommu_ops = { .pgsize_bitmap = OMAP_IOMMU_PGSIZES, }; +/* + * OMAP Device MMU(IOMMU) detection + */ +static int omap_iommu_probe(struct platform_device *pdev) +{ + int err = -ENODEV; + int irq; + struct omap_iommu *obj; + struct resource *res; + struct iommu_platform_data *pdata = pdev->dev.platform_data; + + obj = kzalloc(sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL); + if (!obj) + return -ENOMEM; + + obj->nr_tlb_entries = pdata->nr_tlb_entries; + obj->name = pdata->name; + obj->dev = &pdev->dev; + obj->ctx = (void *)obj + sizeof(*obj); + obj->da_start = pdata->da_start; + obj->da_end = pdata->da_end; + + spin_lock_init(&obj->iommu_lock); + mutex_init(&obj->mmap_lock); + spin_lock_init(&obj->page_table_lock); + INIT_LIST_HEAD(&obj->mmap); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + err = -ENODEV; + goto err_mem; + } + + res = request_mem_region(res->start, resource_size(res), + dev_name(&pdev->dev)); + if (!res) { + err = -EIO; + goto err_mem; + } + + obj->regbase = ioremap(res->start, resource_size(res)); + if (!obj->regbase) { + err = -ENOMEM; + goto err_ioremap; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + err = -ENODEV; + goto err_irq; + } + + err = request_irq(irq, iommu_fault_handler, IRQF_SHARED, + dev_name(&pdev->dev), obj); + if (err < 0) + goto err_irq; + platform_set_drvdata(pdev, obj); + + bus_set_iommu(&platform_bus_type, &omap_iommu_ops); + + pm_runtime_irq_safe(obj->dev); + pm_runtime_enable(obj->dev); + + dev_info(&pdev->dev, "%s registered\n", obj->name); + return 0; + +err_irq: + iounmap(obj->regbase); +err_ioremap: + release_mem_region(res->start, resource_size(res)); +err_mem: + kfree(obj); + return err; +} + +static int omap_iommu_remove(struct platform_device *pdev) +{ + int irq; + struct resource *res; + struct omap_iommu *obj = platform_get_drvdata(pdev); + + iopgtable_clear_entry_all(obj); + + irq = platform_get_irq(pdev, 0); + free_irq(irq, obj); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + release_mem_region(res->start, resource_size(res)); + iounmap(obj->regbase); + + pm_runtime_disable(obj->dev); + + dev_info(&pdev->dev, "%s removed\n", obj->name); + kfree(obj); + return 0; +} + +static struct platform_driver omap_iommu_driver = { + .probe = omap_iommu_probe, + .remove = omap_iommu_remove, + .driver = { + .name = "omap-iommu", + }, +}; + static int __init omap_iommu_init(void) { struct kmem_cache *p; @@ -1277,8 +1280,6 @@ static int __init omap_iommu_init(void) return -ENOMEM; iopte_cachep = p; - bus_set_iommu(&platform_bus_type, &omap_iommu_ops); - return platform_driver_register(&omap_iommu_driver); } /* must be ready before omap3isp is probed */