Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763484AbYHFA5s (ORCPT ); Tue, 5 Aug 2008 20:57:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762738AbYHFA50 (ORCPT ); Tue, 5 Aug 2008 20:57:26 -0400 Received: from kirsty.vergenet.net ([202.4.237.240]:43346 "EHLO kirsty.vergenet.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762659AbYHFA5X (ORCPT ); Tue, 5 Aug 2008 20:57:23 -0400 Date: Wed, 6 Aug 2008 10:57:21 +1000 From: Simon Horman To: Matthew Wilcox Cc: Sven Wegener , Michael Ellerman , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Jesse Barnes Subject: Re: [patch] PCI: check the return value of device_create_bin_file() in pci_create_bus() Message-ID: <20080806005718.GE32143@verge.net.au> References: <20080805101605.GA19382@verge.net.au> <1217932416.7758.4.camel@localhost> <20080805101605.GA19382@verge.net.au> <20080805110006.GA13409@verge.net.au> <20080805111406.GA13899@verge.net.au> <20080805112814.GO26461@parisc-linux.org> <20080805121531.GA29763@verge.net.au> <20080805122639.GP26461@parisc-linux.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080805122639.GP26461@parisc-linux.org> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3948 Lines: 105 Check the return value of device_create_bin_file in pci_create_bus and unwind if necessary. Don't propagate error to caller, as failure to create these files shouldn't prevent PCI from being initialised. Cc: Sven Wegener Cc: Michael Ellerman Cc: Matthew Wilcox Signed-off-by: Simon Horman --- Tue, 5 Aug 2008 21:14:07 +1000 * Revised the patch to free and NULLify b->legacy_io in pci_create_legacy_files() on error. Thanks to Sven Wegener and Michael Ellerman for pointing out this omission. Wed, 06 Aug 2008 10:49:30 +1000 * Don't propagate error to caller, as failure to create these files shouldn't prevent PCI from being initialised. Thanks to Matthew Wilcox This patch resolves the following warnings: drivers/pci/probe.c: In function `pci_create_bus': drivers/pci/probe.c:66: warning: ignoring return value of `device_create_bin_file', declared with attribute warn_unused_result drivers/pci/probe.c:74: warning: ignoring return value of `device_create_bin_file', declared with attribute warn_unused_result # ia64-unknown-linux-gnu-gcc --version ia64-unknown-linux-gnu-gcc (GCC) 3.4.5 Copyright (C) 2004 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Index: linux-2.6/drivers/pci/probe.c =================================================================== --- linux-2.6.orig/drivers/pci/probe.c 2008-08-06 09:22:06.000000000 +1000 +++ linux-2.6/drivers/pci/probe.c 2008-08-06 09:41:09.000000000 +1000 @@ -52,27 +52,46 @@ EXPORT_SYMBOL(no_pci_devices); * Some platforms allow access to legacy I/O port and ISA memory space on * a per-bus basis. This routine creates the files and ties them into * their associated read, write and mmap files from pci-sysfs.c + * + * On error unwind, but don't propogate the error to the caller + * as it is ok to set up the PCI bus without these files. */ static void pci_create_legacy_files(struct pci_bus *b) { + int error; + b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2, GFP_ATOMIC); - if (b->legacy_io) { - b->legacy_io->attr.name = "legacy_io"; - b->legacy_io->size = 0xffff; - b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; - b->legacy_io->read = pci_read_legacy_io; - b->legacy_io->write = pci_write_legacy_io; - device_create_bin_file(&b->dev, b->legacy_io); - - /* Allocated above after the legacy_io struct */ - b->legacy_mem = b->legacy_io + 1; - b->legacy_mem->attr.name = "legacy_mem"; - b->legacy_mem->size = 1024*1024; - b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; - b->legacy_mem->mmap = pci_mmap_legacy_mem; - device_create_bin_file(&b->dev, b->legacy_mem); - } + if (!b->legacy_io) + return; + + b->legacy_io->attr.name = "legacy_io"; + b->legacy_io->size = 0xffff; + b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; + b->legacy_io->read = pci_read_legacy_io; + b->legacy_io->write = pci_write_legacy_io; + error = device_create_bin_file(&b->dev, b->legacy_io); + if (error) + goto legacy_io_err; + + /* Allocated above after the legacy_io struct */ + b->legacy_mem = b->legacy_io + 1; + b->legacy_mem->attr.name = "legacy_mem"; + b->legacy_mem->size = 1024*1024; + b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; + b->legacy_mem->mmap = pci_mmap_legacy_mem; + error = device_create_bin_file(&b->dev, b->legacy_mem); + if (error) + goto legacy_mem_err; + + return 0; + +legacy_mem_err: + device_remove_bin_file(&b->dev, b->legacy_io); +legacy_io_err: + kfree(b->legacy_io); + b->legacy_io = NULL; + return; } void pci_remove_legacy_files(struct pci_bus *b) -- 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/