From: Jeremiah Mahler <jmmahler@gmail.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: tpmdd-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org,
peterhuewe@gmx.de, gregkh@linuxfoundation.org,
jgunthorpe@obsidianresearch.com, dhowells@redhat.com,
artem.bityutskiy@linux.intel.com, Tejun Heo <tj@kernel.org>,
NeilBrown <neilb@suse.de>, Guenter Roeck <linux@roeck-us.net>,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [BUG, PATCH 03/10] sysfs: added __compat_only_sysfs_link_entry_to_kobj()
Date: Sat, 7 Nov 2015 10:08:56 -0800 [thread overview]
Message-ID: <20151107180856.GA2250@newt.localdomain> (raw)
In-Reply-To: <20151107114137.GA5100@intel.com>
Jarkko,
On Sat, Nov 07, 2015 at 01:41:37PM +0200, Jarkko Sakkinen wrote:
> On Sat, Nov 07, 2015 at 12:55:43PM +0200, Jarkko Sakkinen wrote:
> > On Fri, Nov 06, 2015 at 06:55:18PM -0800, Jeremiah Mahler wrote:
> > > Jarkko,
> > >
[...]
> > > > + entry = kernfs_find_and_get(target_kobj->sd, target_name);
> > > > + if (!entry) {
> > > > + kernfs_put(target);
> > > > + return -ENOENT;
> > > > + }
> > > > +
> > >
> > > On an Acer C720 this call to kernfs_find_and_get fails resulting in
> > > a failed resume after suspend.
> > >
> > > Apparently it can't find an object for the name "ppi".
> > >
> > > This bug does not appear until the next patch is applied which
> > > calls __compat_only_sysfs_link_entry_to_kobj.
> >
> > I think I might have found something thanks to your help
> >
> > First I found this old bug:
> >
> > https://bugzilla.redhat.com/show_bug.cgi?id=1096511
> >
> > What is happening is that DSM is not found and therefore tpm_add_ppi()
> > does not add ppi to sysfs groups array.
> >
> > __compat_only_sysfs_link_entry_to_kobj() is called after tpm_add_ppi
> > unconditionally for TPM1.
> >
> > I'll implement a fix for this ASAP.
> >
> > Thank you for great effort on finding tis!
>
> I pushed a fix over here:
>
> https://github.com/jsakkine/linux-tpmdd/tree/fixes
>
This fix does work since it effectively avoids the call to
__compat_only_sysfs_link_entry_to_kobj().
Have you tested cases where __compat_only_sysfs_link_entry_to_kobj()
is actually used?
[...]
--
- Jeremiah Mahler
next prev parent reply other threads:[~2015-11-07 18:09 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-16 18:40 [PATCH 00/10] TPM2 updates for 4.4 Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 01/10] tpm, tpm_crb: fix unaligned read of the command buffer address Jarkko Sakkinen
2015-10-18 3:02 ` Peter Hüwe
2015-10-18 11:15 ` Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 02/10] tpm, tpm_tis: fix tpm_tis ACPI detection issue with TPM 2.0 Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 03/10] sysfs: added __compat_only_sysfs_link_entry_to_kobj() Jarkko Sakkinen
2015-10-18 1:37 ` Peter Hüwe
2015-10-18 11:21 ` Jarkko Sakkinen
2015-11-07 0:23 ` Jeremiah Mahler
2015-11-09 22:32 ` Jason Gunthorpe
2015-11-07 2:55 ` [BUG, PATCH " Jeremiah Mahler
2015-11-07 10:55 ` Jarkko Sakkinen
2015-11-07 11:41 ` Jarkko Sakkinen
2015-11-07 18:08 ` Jeremiah Mahler [this message]
2015-11-07 22:31 ` Jarkko Sakkinen
2015-11-07 23:11 ` Jeremiah Mahler
2015-11-08 0:49 ` Jarkko Sakkinen
2015-11-08 3:04 ` Jeremiah Mahler
2015-11-08 7:46 ` Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 04/10] tpm: move the PPI attributes to character device directory Jarkko Sakkinen
2015-11-04 18:17 ` [BUG, bisect, PATCH " Jeremiah Mahler
2015-11-05 9:22 ` Jarkko Sakkinen
2015-11-05 11:05 ` [tpmdd-devel] " Jarkko Sakkinen
2015-11-05 16:47 ` Jeremiah Mahler
2015-11-05 17:46 ` Jarkko Sakkinen
2015-11-05 18:17 ` Jeremiah Mahler
2015-11-06 13:45 ` Jarkko Sakkinen
2015-11-07 2:54 ` Jeremiah Mahler
2015-10-16 18:40 ` [PATCH 05/10] tpm: update PPI documentation to address the location change Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 06/10] tpm: introduce tpm_buf Jarkko Sakkinen
2015-10-18 2:57 ` Peter Hüwe
2015-10-18 11:19 ` Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 07/10] keys, trusted: move struct trusted_key_options to trusted-type.h Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 08/10] tpm: seal/unseal for TPM 2.0 Jarkko Sakkinen
2015-11-07 18:58 ` Jeremiah Mahler
2015-11-07 21:39 ` Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 09/10] keys, trusted: seal/unseal with TPM 2.0 chips Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 10/10] MAINTAINERS: add new maintainer for TPM DEVICE DRIVER Jarkko Sakkinen
2015-10-16 19:06 ` [tpmdd-devel] [PATCH 00/10] TPM2 updates for 4.4 Kevin Strasser
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