Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751788AbbEZHbV (ORCPT ); Tue, 26 May 2015 03:31:21 -0400 Received: from mail-lb0-f173.google.com ([209.85.217.173]:35575 "EHLO mail-lb0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751723AbbEZHbQ (ORCPT ); Tue, 26 May 2015 03:31:16 -0400 From: Ricardo Ribalda Delgado To: Greg Kroah-Hartman , Grant Likely , Rob Herring , Andrew Morton , Jakub Sitnicki , Vivek Goyal , Bjorn Helgaas , Jiang Liu , Mike Travis , Thierry Reding , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Cc: Ricardo Ribalda Delgado Subject: [PATCH v5 2/4] base/platform: Continue on insert_resource() error Date: Tue, 26 May 2015 09:31:24 +0200 Message-Id: <1432625486-15442-3-git-send-email-ricardo.ribalda@gmail.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1432625486-15442-1-git-send-email-ricardo.ribalda@gmail.com> References: <1432625486-15442-1-git-send-email-ricardo.ribalda@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3596 Lines: 108 insert_resource() can fail when the resource added overlaps (partially or fully) with another. Device tree and AMBA devices may contain resources that overlap, so they could not call platform_device_add (see 02bbde7849e6 ('Revert "of: use platform_device_add"'))" On the other hand, device trees are released using platform_device_unregister(). This function calls platform_device_del(), which calls release_resource(), that crashes when the resource has not been added with with insert_resource. This was not an issue when the device tree could not be modified online, but this is not the case anymore. This patch let the flow continue when there is an insert error, after notifying the user with a dev_err(). r->parent is set to NULL, so platform_device_del() knows that the resource was not added, and therefore it should not be released. Acked-by: Rob Herring Signed-off-by: Ricardo Ribalda Delgado --- drivers/base/platform.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) diff --git a/drivers/base/platform.c b/drivers/base/platform.c index 46a56f694cec..5a29387e5ff6 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -332,7 +332,7 @@ int platform_device_add(struct platform_device *pdev) */ ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); if (ret < 0) - goto err_out; + return ret; pdev->id = ret; pdev->id_auto = true; dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); @@ -340,7 +340,7 @@ int platform_device_add(struct platform_device *pdev) } for (i = 0; i < pdev->num_resources; i++) { - struct resource *p, *r = &pdev->resource[i]; + struct resource *conflict, *p, *r = &pdev->resource[i]; unsigned long type = resource_type(r); if (r->name == NULL) @@ -357,11 +357,14 @@ int platform_device_add(struct platform_device *pdev) p = &ioport_resource; } - if (insert_resource(p, r)) { - dev_err(&pdev->dev, "failed to claim resource %d\n", i); - ret = -EBUSY; - goto failed; - } + conflict = insert_resource_conflict(p, r); + if (!conflict) + continue; + + dev_err(&pdev->dev, + "ignoring resource %pR (conflicts with %s %pR)\n", + r, conflict->name, conflict); + p->parent = NULL; } pr_debug("Registering platform device '%s'. Parent at %s\n", @@ -371,7 +374,7 @@ int platform_device_add(struct platform_device *pdev) if (ret == 0) return ret; - failed: + /* Failure path */ if (pdev->id_auto) { ida_simple_remove(&platform_devid_ida, pdev->id); pdev->id = PLATFORM_DEVID_AUTO; @@ -381,11 +384,11 @@ int platform_device_add(struct platform_device *pdev) struct resource *r = &pdev->resource[i]; unsigned long type = resource_type(r); - if (type == IORESOURCE_MEM || type == IORESOURCE_IO) + if ((type == IORESOURCE_MEM || type == IORESOURCE_IO) && + r->parent) release_resource(r); } - err_out: return ret; } EXPORT_SYMBOL_GPL(platform_device_add); @@ -414,7 +417,8 @@ void platform_device_del(struct platform_device *pdev) struct resource *r = &pdev->resource[i]; unsigned long type = resource_type(r); - if (type == IORESOURCE_MEM || type == IORESOURCE_IO) + if ((type == IORESOURCE_MEM || type == IORESOURCE_IO) && + r->parent) release_resource(r); } } -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/