From patchwork Wed Nov 4 13:12:48 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 539917 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id B63E91402C3 for ; Thu, 5 Nov 2015 00:30:49 +1100 (AEDT) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 9CA591A327A for ; Thu, 5 Nov 2015 00:30:49 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from e28smtp03.in.ibm.com (e28smtp03.in.ibm.com [122.248.162.3]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 904801A0CC7 for ; Thu, 5 Nov 2015 00:13:49 +1100 (AEDT) Received: from /spool/local by e28smtp03.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Wed, 4 Nov 2015 18:43:45 +0530 X-Helo: d28dlp03.in.ibm.com X-MailFrom: gwshan@linux.vnet.ibm.com X-RcptTo: linuxppc-dev@lists.ozlabs.org Received: from d28relay01.in.ibm.com (d28relay01.in.ibm.com [9.184.220.58]) by d28dlp03.in.ibm.com (Postfix) with ESMTP id 2EFA0125806C for ; Wed, 4 Nov 2015 18:43:44 +0530 (IST) Received: from d28av02.in.ibm.com (d28av02.in.ibm.com [9.184.220.64]) by d28relay01.in.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id tA4DDQML4718952 for ; Wed, 4 Nov 2015 18:43:26 +0530 Received: from d28av02.in.ibm.com (localhost [127.0.0.1]) by d28av02.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id tA4DDOQ4032551 for ; Wed, 4 Nov 2015 18:43:26 +0530 Received: from gwshan ([9.192.177.12]) by d28av02.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with SMTP id tA4DDAeO031325; Wed, 4 Nov 2015 18:43:20 +0530 Received: by gwshan (Postfix, from userid 1000) id D6634942DB5; Thu, 5 Nov 2015 00:13:12 +1100 (AEDT) From: Gavin Shan To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v7 48/50] drivers/of: Return allocated memory from of_fdt_unflatten_tree() Date: Thu, 5 Nov 2015 00:12:48 +1100 Message-Id: <1446642770-4681-49-git-send-email-gwshan@linux.vnet.ibm.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1446642770-4681-1-git-send-email-gwshan@linux.vnet.ibm.com> References: <1446642770-4681-1-git-send-email-gwshan@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15110413-0009-0000-0000-000008A838EB X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, aik@ozlabs.ru, linux-pci@vger.kernel.org, panto@antoniou-consulting.com, Gavin Shan , grant.likely@linaro.org, robherring2@gmail.com, bhelgaas@google.com, frowand.list@gmail.com MIME-Version: 1.0 Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" This returns the allocate memory chunk, storing the unflattened device tree, from of_fdt_unflatten_tree() so that memory chunk can be released on demand in PowerNV PCI hotplug driver. Signed-off-by: Gavin Shan Acked-by: Rob Herring --- drivers/of/fdt.c | 25 ++++++++++++++++--------- include/linux/of_fdt.h | 6 +++--- 2 files changed, 19 insertions(+), 12 deletions(-) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 8c8228e..b0a5708 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -447,11 +447,14 @@ static void *unflatten_dt_nodes(const void *blob, * @mynodes: The device_node tree created by the call * @dt_alloc: An allocator that provides a virtual address to memory * for the resulting tree + * + * Returns NULL on failure or the memory chunk containing the unflattened + * device tree on success. */ -static void __unflatten_device_tree(const void *blob, - struct device_node *dad, - struct device_node **mynodes, - void * (*dt_alloc)(u64 size, u64 align)) +static void *__unflatten_device_tree(const void *blob, + struct device_node *dad, + struct device_node **mynodes, + void *(*dt_alloc)(u64 size, u64 align)) { unsigned long size; void *mem; @@ -460,7 +463,7 @@ static void __unflatten_device_tree(const void *blob, if (!blob) { pr_debug("No device tree pointer\n"); - return; + return NULL; } pr_debug("Unflattening device tree:\n"); @@ -470,7 +473,7 @@ static void __unflatten_device_tree(const void *blob, if (fdt_check_header(blob)) { pr_err("Invalid device tree blob header\n"); - return; + return NULL; } /* First pass, scan for size */ @@ -494,6 +497,7 @@ static void __unflatten_device_tree(const void *blob, be32_to_cpup(mem + size)); pr_debug(" <- unflatten_device_tree()\n"); + return mem; } static void *kernel_tree_alloc(u64 size, u64 align) @@ -511,10 +515,13 @@ static void *kernel_tree_alloc(u64 size, u64 align) * tree of struct device_node. It also fills the "name" and "type" * pointers of the nodes so the normal device-tree walking functions * can be used. + * + * Returns NULL on failure or the memory chunk containing the unflattened + * device tree on success. */ -void of_fdt_unflatten_tree(const unsigned long *blob, - struct device_node *dad, - struct device_node **mynodes) +void *of_fdt_unflatten_tree(const unsigned long *blob, + struct device_node *dad, + struct device_node **mynodes) { __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc); } diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h index 3644960..b87b26a7 100644 --- a/include/linux/of_fdt.h +++ b/include/linux/of_fdt.h @@ -37,9 +37,9 @@ extern bool of_fdt_is_big_endian(const void *blob, unsigned long node); extern int of_fdt_match(const void *blob, unsigned long node, const char *const *compat); -extern void of_fdt_unflatten_tree(const unsigned long *blob, - struct device_node *dad, - struct device_node **mynodes); +extern void *of_fdt_unflatten_tree(const unsigned long *blob, + struct device_node *dad, + struct device_node **mynodes); /* TBD: Temporary export of fdt globals - remove when code fully merged */ extern int __initdata dt_root_addr_cells;