diff options
| author | Andreas Herrmann <andreas.herrmann3@amd.com> | 2012-04-12 16:48:01 +0200 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-05-11 13:14:31 +0100 |
| commit | 31114c4a00db7d7fc730648906bab2a343e22150 (patch) | |
| tree | 8c6694b43a79043e63b0d423d6284d59a8d5a62f /arch | |
| parent | 749ff0d78dd4a808d6b27d459025c0f3a9ac4092 (diff) | |
x86, microcode: Fix sysfs warning during module unload on unsupported CPUs
commit a956bd6f8583326b18348ab1452b4686778f785d upstream.
Loading the microcode driver on an unsupported CPU and subsequently
unloading the driver causes
WARNING: at fs/sysfs/group.c:138 mc_device_remove+0x5f/0x70 [microcode]()
Hardware name: 01972NG
sysfs group ffffffffa00013d0 not found for kobject 'cpu0'
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]
Pid: 4560, comm: modprobe Not tainted 3.4.0-rc2-00002-g258f742 #5
Call Trace:
[<ffffffff8103113b>] ? warn_slowpath_common+0x7b/0xc0
[<ffffffff81031235>] ? warn_slowpath_fmt+0x45/0x50
[<ffffffff81120e74>] ? sysfs_remove_group+0x34/0x120
[<ffffffffa00000ef>] ? mc_device_remove+0x5f/0x70 [microcode]
[<ffffffff81331eb9>] ? subsys_interface_unregister+0x69/0xa0
[<ffffffff81563526>] ? mutex_lock+0x16/0x40
[<ffffffffa0000c3e>] ? microcode_exit+0x50/0x92 [microcode]
[<ffffffff8107051d>] ? sys_delete_module+0x16d/0x260
[<ffffffff810a0065>] ? wait_iff_congested+0x45/0x110
[<ffffffff815656af>] ? page_fault+0x1f/0x30
[<ffffffff81565ba2>] ? system_call_fastpath+0x16/0x1b
on recent kernels.
This is due to commit 8a25a2fd126c ("cpu: convert 'cpu' and
'machinecheck' sysdev_class to a regular subsystem") which renders
commit 6c53cbfced04 ("x86, microcode: Correct sysdev_add error path")
useless.
See http://marc.info/?l=linux-kernel&m=133416246406478
Avoid above warning by restoring the old driver behaviour before
6c53cbfced04 ("x86, microcode: Correct sysdev_add error path").
Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: http://lkml.kernel.org/r/20120411163849.GE4794@alberich.amd.com
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
[bwh: Backported to 3.2: deleted line uses sys_dev, not dev]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/microcode_core.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c index 9d46f5e43b5..563a09dcbcf 100644 --- a/arch/x86/kernel/microcode_core.c +++ b/arch/x86/kernel/microcode_core.c @@ -418,10 +418,8 @@ static int mc_sysdev_add(struct sys_device *sys_dev) if (err) return err; - if (microcode_init_cpu(cpu) == UCODE_ERROR) { - sysfs_remove_group(&sys_dev->kobj, &mc_attr_group); + if (microcode_init_cpu(cpu) == UCODE_ERROR) return -EINVAL; - } return err; } |