linux-kernel - Re: [PATCH 01/24] kobject: return actual error on kset_create_and

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Date:	Tue, 17 Jun 2014 08:50:30 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Jeff Liu <jeff.liu@...cle.com>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Christoph Lameter <cl@...two.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, benh@...nel.crashing.org,
	paulus@...ba.org, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, herbert@...dor.apana.org.au,
	davem@...emloft.net, stefanr@...6.in-berlin.de, joro@...tes.org,
	jejb@...isc-linux.org, deller@....de, bhelgaas@...gle.com,
	clm@...com, Josef Bacik <jbacik@...com>, swhiteho@...hat.com,
	bharrosh@...asas.com, bhalevy@...marydata.com, ccaulfie@...hat.com,
	teigland@...hat.com, Theodore Ts'o <tytso@....edu>,
	adilger.kernel@...ger.ca, jaegeuk@...nel.org,
	cm224.lee@...sung.com, Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>, casey@...aufler-ca.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/24] kobject: return actual error on kset_create_and_add

On Tue, Jun 17, 2014 at 10:56:04PM +0800, Jeff Liu wrote:
> 
> On 06/17/2014 22:42 PM, James Bottomley wrote:
> > On Tue, 2014-06-17 at 22:25 +0800, Jeff Liu wrote:
> >> From: Jie Liu <jeff.liu@...cle.com>
> >>
> >> It's better to return the actual error rather than NULL because
> >> kset_register() can failed due to other reasons.
> >>
> >> Cc: Christoph Lameter <cl@...ux-foundation.org>
> >> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> >> Cc: Andrew Morton <akpm@...ux-foundation.org>
> >> Cc: Pekka Enberg <penberg@...nel.org>
> >> Cc: Matt Mackall <mpm@...enic.com>
> >> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> >> Cc: Paul Mackerras <paulus@...ba.org>
> >> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> >> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> >> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> >> Cc: David S. Miller <davem@...emloft.net>
> >> Cc: Stefan Richter <stefanr@...6.in-berlin.de>
> >> Cc: Joerg Roedel <joro@...tes.org>
> >> Cc: James E.J. Bottomley <JBottomley@...allels.com>
> >> Cc: Helge Deller <deller@....de>
> >> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> >> Cc: Chris Mason <clm@...com>
> >> Cc: Josef Bacik <jbacik@...com>
> >> Cc: Steven Whitehouse <swhiteho@...hat.com>
> >> Cc: Boaz Harrosh <bharrosh@...asas.com>
> >> Cc: Benny Halevy <bhalevy@...marydata.com>
> >> Cc: Christine Caulfield <ccaulfie@...hat.com>
> >> Cc: David Teigland <teigland@...hat.com>
> >> Cc: Theodore Ts'o <tytso@....edu>
> >> Cc: Andreas Dilger <adilger.kernel@...ger.ca>
> >> Cc: Jaegeuk Kim <jaegeuk@...nel.org>
> >> Cc: Changman Lee <cm224.lee@...sung.com>
> >> Cc: Mark Fasheh <mfasheh@...e.com>
> >> Cc: Joel Becker <jlbec@...lplan.org>
> >> Cc: Casey Schaufler <casey@...aufler-ca.com>
> >> Signed-off-by: Jie Liu <jeff.liu@...cle.com>
> >> ---
> >>  lib/kobject.c | 4 ++--
> >>  1 file changed, 2 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/lib/kobject.c b/lib/kobject.c
> >> index 58751bb..538c617 100644
> >> --- a/lib/kobject.c
> >> +++ b/lib/kobject.c
> >> @@ -919,11 +919,11 @@ struct kset *kset_create_and_add(const char *name,
> >>  
> >>  	kset = kset_create(name, uevent_ops, parent_kobj);
> >>  	if (!kset)
> >> -		return NULL;
> >> +		return ERR_PTR(-ENOMEM);
> >>  	error = kset_register(kset);
> >>  	if (error) {
> >>  		kfree(kset);
> >> -		return NULL;
> >> +		return ERR_PTR(error);
> >>  	}
> >>  	return kset;
> >>  }
> > 
> > This patch series isn't bisectable.  When changing an error signal from
> > NULL to non-NULL, you have to do it as one patch, otherwise if a
> > bisection lands in here we'll get error returns from all our kobject
> > kset code and the kernel won't boot.
> 
> Thanks for pointing this out.
> 
> > It's fine if you're sending it out as 24 patches for review, but it has
> > to be applied as a single one.
> 
> Ok, I'll post the v2 patch as a single one once this series has been reviewed.

Also, now that you sent a bunch of different patches out, some
maintainers will not realize that this first one has to be applied (i.e.
you gave them no sense that there was a dependancy.)

You will have to watch very carefully to ensure that those patches do
not now get accepted, as they will break the existing code.

Not good.

greg k-h
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