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Path: news.gmane.org!not-for-mail
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From: Borislav Petkov <borislav.petkov@amd.com>
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Newsgroups: gmane.linux.kernel
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Subject: [PATCH 1/2] x86, microcode: Fix sysfs warning during module unload
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Date: Thu, 12 Apr 2012 18:30:38 +0200
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Lines: 83
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Message-ID: <20120412163038.GL24549@aftab>
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References: <20120411163849.GE4794@alberich.amd.com>
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<20120411200601.GC12288@kroah.com>
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<20120412162351.GJ24549@aftab>
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NNTP-Posting-Date: Thu, 12 Apr 2012 16:31:52 +0000 (UTC)
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Cc: Andreas Herrmann <andreas.herrmann3@amd.com>,
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Kay Sievers <kay.sievers@vrfy.org>,
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Dave Jones <davej@redhat.com>, <linux-kernel@vger.kernel.org>
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To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Xref: news.gmane.org gmane.linux.kernel:1281049
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1281049>
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From: Andreas Herrmann <andreas.herrmann3@amd.com>
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Date: Thu, 12 Apr 2012 16:48:01 +0200
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Subject: [PATCH 1/2] x86, microcode: Fix sysfs warning during module unload on unsupported CPUs
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Loading microcode driver on an unsupported CPU and subsequently
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unloading the driver causes
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WARNING: at fs/sysfs/group.c:138 mc_device_remove+0x5f/0x70 [microcode]()
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Hardware name: 01972NG
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sysfs group ffffffffa00013d0 not found for kobject 'cpu0'
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Modules linked in: snd_hda_codec_hdmi snd_hda_codec_conexant snd_hda_intel btusb snd_hda_codec bluetooth thinkpad_acpi rfkill microcode(-) [last unloaded: cfg80211]
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Pid: 4560, comm: modprobe Not tainted 3.4.0-rc2-00002-g258f742 #5
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Call Trace:
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[<ffffffff8103113b>] ? warn_slowpath_common+0x7b/0xc0
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[<ffffffff81031235>] ? warn_slowpath_fmt+0x45/0x50
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[<ffffffff81120e74>] ? sysfs_remove_group+0x34/0x120
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[<ffffffffa00000ef>] ? mc_device_remove+0x5f/0x70 [microcode]
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[<ffffffff81331eb9>] ? subsys_interface_unregister+0x69/0xa0
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[<ffffffff81563526>] ? mutex_lock+0x16/0x40
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[<ffffffffa0000c3e>] ? microcode_exit+0x50/0x92 [microcode]
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[<ffffffff8107051d>] ? sys_delete_module+0x16d/0x260
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[<ffffffff810a0065>] ? wait_iff_congested+0x45/0x110
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[<ffffffff815656af>] ? page_fault+0x1f/0x30
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[<ffffffff81565ba2>] ? system_call_fastpath+0x16/0x1b
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on recent kernels.
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This is due to
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commit 8a25a2fd126c621f44f3aeaef80d51f00fc11639
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(cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular
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subsystem)
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which renders
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commit 6c53cbfced048c421e4f72cb2183465f68fbc5e7
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(x86, microcode: Correct sysdev_add error path)
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useless.
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See http://marc.info/?l=linux-kernel&m=133416246406478
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Avoid above warning by restoring the old driver behaviour before
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commit 6c53cbfced048c421e4f72cb2183465f68fbc5e7 (x86, microcode:
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Correct sysdev_add error path)
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Cc: stable@vger.kernel.org
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Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
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Cc: Borislav Petkov <borislav.petkov@amd.com>
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Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
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---
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arch/x86/kernel/microcode_core.c | 4 +---
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1 files changed, 1 insertions(+), 3 deletions(-)
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diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
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index 87a0f86..d389e74 100644
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--- a/arch/x86/kernel/microcode_core.c
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+++ b/arch/x86/kernel/microcode_core.c
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@@ -419,10 +419,8 @@ static int mc_device_add(struct device *dev, struct subsys_interface *sif)
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if (err)
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return err;
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- if (microcode_init_cpu(cpu) == UCODE_ERROR) {
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- sysfs_remove_group(&dev->kobj, &mc_attr_group);
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+ if (microcode_init_cpu(cpu) == UCODE_ERROR)
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return -EINVAL;
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- }
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return err;
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}
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--
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1.7.8.4
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--
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Regards/Gruss,
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Boris.
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Advanced Micro Devices GmbH
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Einsteinring 24, 85609 Dornach
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GM: Alberto Bozzo
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Reg: Dornach, Landkreis Muenchen
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HRB Nr. 43632 WEEE Registernr: 129 19551
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