linux-kernel - Re: [BUG, PATCH 03/10] sysfs: added __compat_only_sysfs_link_entry_to

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Date:	Sat, 7 Nov 2015 15:11:47 -0800
From:	Jeremiah Mahler <jmmahler@...il.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	peterhuewe@....de, gregkh@...uxfoundation.org,
	jgunthorpe@...idianresearch.com, dhowells@...hat.com,
	artem.bityutskiy@...ux.intel.com, Tejun Heo <tj@...nel.org>,
	NeilBrown <neilb@...e.de>, Guenter Roeck <linux@...ck-us.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [BUG, PATCH 03/10] sysfs: added
 __compat_only_sysfs_link_entry_to_kobj()

Jarkko,

On Sun, Nov 08, 2015 at 12:31:09AM +0200, Jarkko Sakkinen wrote:
> On Sat, Nov 07, 2015 at 10:08:56AM -0800, Jeremiah Mahler wrote:
> > 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,
> > > > > 
[...]
> > > 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?
> 
> Yes, of course I have. And I checked your DSDT and my assumption was
> correct. There was no DSM in the ACPI object.
> 
> However, there is probably another regression but it is caused by some
> patch that was added earlier. I strongly believe it is not caused by any
> of my 4.4 patches.
> 
> I think what was happening with you was that
> __compat_only_sysfs_link_entry_to_kobj() was returning -ENOENT, which it
> should do when target is not found. This was propagated to tpm_tis and
> it probably messes up clean up somehow.
> 
> I have to test my hypothesis as soon as possible. The fix that I pushed
> is still valid no matter which way the things are.
> 
> > [...]
> > 
> > -- 
> > - Jeremiah Mahler
> 
> /Jarkko

It sounds like you have the problem figured out and have a good fix.
If I can do anything else to help let me know :-)

-- 
- Jeremiah Mahler
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