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    SubjectRe: 3.2.0-07927-gc49c41a: s2ram: Device 'machinecheck1' does not have a release() function, it is broken and must be fixed
    Date
    On Monday, January 16, 2012, Srivatsa S. Bhat wrote:
    > On 01/16/2012 03:48 PM, Sergei Trofimovich wrote:
    >
    > > With 3.2.0-rc0 I was not able to s2ram twice in a row. Bisected down to
    > >
    > > commit 8a25a2fd126c621f44f3aeaef80d51f00fc11639
    > > Author: Kay Sievers <kay.sievers@vrfy.org>
    > > Date: Wed Dec 21 14:29:42 2011 -0800
    > >
    > > cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem
    > >
    > > it was fixed recently by commit
    > >
    > > commit a3301b751b19f0efbafddc4034f8e7ce6bf3007b
    > > Author: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
    > > Date: Sat Jan 14 08:11:31 2012 +0530
    > >
    > > x86/mce: Fix CPU hotplug and suspend regression related to MCE
    > >
    > > alas the warning pop ups (3.2.0-07927-gc49c41a).
    > >
    > > command for suspend:
    > > sudo sh -c "echo mem > /sys/power/state"
    > >
    > > [ 7915.604188] ------------[ cut here ]------------
    > > [ 7915.604203] WARNING: at drivers/base/core.c:194 device_release+0x85/0x90()
    > > [ 7915.604209] Hardware name: HP Compaq 2510p Notebook PC
    > > [ 7915.604214] Device 'machinecheck1' does not have a release() function, it is broken and must be fixed.
    > > [ 7915.604219] Modules linked in: snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss
    > > ext2 loop kvm_intel kvm fuse scsi_wait_scan usb_storage tun snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_pcm
    > > snd_timer iwl4965 iwlegacy snd mac80211 cfg80211 yenta_socket soundcore pcmcia_core pcmcia_rsrc rfkill i915 sdhci_pci drm_kms_
    > > helper sdhci mmc_core drm e1000e snd_page_alloc i2c_algo_bit
    > > [ 7915.604293] Pid: 30171, comm: sh Not tainted 3.2.0-07927-gc49c41a #190
    > > [ 7915.604298] Call Trace:
    > > [ 7915.604311] [<ffffffff81038f9a>] warn_slowpath_common+0x7a/0xb0
    > > [ 7915.604320] [<ffffffff81039071>] warn_slowpath_fmt+0x41/0x50
    > > [ 7915.604331] [<ffffffff81060781>] ? get_parent_ip+0x11/0x50
    > > [ 7915.604338] [<ffffffff8130a3d5>] device_release+0x85/0x90
    > > [ 7915.604348] [<ffffffff8125483d>] kobject_release+0x8d/0x1d0
    > > [ 7915.604356] [<ffffffff812546dc>] kobject_put+0x2c/0x60
    > > [ 7915.604364] [<ffffffff8130a122>] put_device+0x12/0x20
    > > [ 7915.604371] [<ffffffff8130b235>] device_unregister+0x25/0x60
    > > [ 7915.604383] [<ffffffff81450485>] mce_cpu_callback+0xe2/0x18a
    > > [ 7915.604392] [<ffffffff8105b4bc>] notifier_call_chain+0x4c/0x70
    > > [ 7915.604400] [<ffffffff8105b569>] __raw_notifier_call_chain+0x9/0x10
    > > [ 7915.604408] [<ffffffff8103ab1b>] __cpu_notify+0x1b/0x30
    > > [ 7915.604416] [<ffffffff8103ab40>] cpu_notify+0x10/0x20
    > > [ 7915.604423] [<ffffffff8103ab59>] cpu_notify_nofail+0x9/0x20
    > > [ 7915.604433] [<ffffffff8144345b>] _cpu_down+0x13b/0x250
    > > [ 7915.604441] [<ffffffff8145536c>] ? printk+0x3c/0x40
    > > [ 7915.604450] [<ffffffff8103ad76>] disable_nonboot_cpus+0x86/0x120
    > > [ 7915.604460] [<ffffffff81083598>] suspend_devices_and_enter+0x148/0x240
    > > [ 7915.604469] [<ffffffff810837e9>] enter_state+0x159/0x180
    > > [ 7915.604477] [<ffffffff81082606>] state_store+0xc6/0x140
    > > [ 7915.604485] [<ffffffff81254567>] kobj_attr_store+0x17/0x20
    > > [ 7915.604494] [<ffffffff81142ce4>] sysfs_write_file+0xf4/0x170
    > > [ 7915.604504] [<ffffffff810e15e6>] vfs_write+0xc6/0x180
    > > [ 7915.604512] [<ffffffff810e18fc>] sys_write+0x4c/0x90
    > > [ 7915.604521] [<ffffffff81459122>] system_call_fastpath+0x16/0x1b
    > > [ 7915.604528] ---[ end trace a06cd82fe48c1076 ]---
    > >
    >
    >
    > Hi Sergei,
    >
    > As I noted in the mail in which I posted that patch
    > (http://thread.gmane.org/gmane.linux.kernel/1237745/focus=1239134),
    > my patch just fixes the suspend issue. It doesn't attempt to fix the
    > "machinecheck not having a release() function" warning. And as mentioned
    > in the preceding discussion in the same thread,
    > (http://thread.gmane.org/gmane.linux.kernel/1237745/focus=1239052)
    > this warning is not a problem for suspend to work.
    >
    > Of course, we have to get rid of this warning and one easy and trivial
    > way to get rid of this would be to add a dummy release() function for
    > MCE, since technically there is nothing to be released, since we use
    > per-cpu allocations of struct device.
    >
    > But the only reason I haven't really jumped into writing such a patch
    > is that I would prefer to get the semantics right - adding a dummy
    > function is IMO something like working around the rules of the driver-core
    > framework just to silence the warning. Hence I feel we should resort
    > to it _only_ if there is nothing better we can do about this.
    >
    > Just to re-instate, an end-user need not really worry about this warning
    > too much since this was there before (at a different place, and hidden)
    > when things were working fine... Hence it would be worthwhile to fix
    > this warning "correctly" if possible, than just do a quick and dirty
    > "silence the warning" kind of workaround.

    Well, since there's nothing to release in there, I really see only two
    possible "fixes": either silence the warning the way you describe, or
    remove it from the core.

    Thanks,
    Rafael


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