linux-kernel - RE: [char-misc 1/2 4.3 V2] mei: Fix debugfs filename in error output

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Date:	Sun, 25 Oct 2015 12:45:30 +0000
From:	"Winkler, Tomas" <tomas.winkler@...el.com>
To:	'Greg Kroah-Hartman' <gregkh@...uxfoundation.org>
CC:	"Usyskin, Alexander" <alexander.usyskin@...el.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'Alexander Kuleshov'" <kuleshovmail@...il.com>
Subject: RE: [char-misc 1/2 4.3 V2] mei: Fix debugfs filename in error output

> 
> > > > >  		goto err;
> > > >
> > > > You should never care if a debugfs call fails or not.
> > >
> > > The system should not be dependent on the debug feature but, it is
> > > always good to know if there our system is failing
> >
> > And what can you do if it is "failing"?  Really nothing, so there's
> > nothing to check here.
> 
> As far as I can see the function debugfs_create_file may fail for a few reasons and
> it return  NULL if this is happening.
> I might ignore the error as you suggested, but I'm not sure why not to give a hint
> in log that this happened.
> Second, as far as I scanned the kernel sources, checking the return value of this
> function and acting on this is very common.
> 
> > >   Also, this will
> > > > "fail" if you don't have CONFIG_DEBUGFS enabled, which means you are
> > > > using the api wrong :(
> > >
> > > The whole file is not compiled if CONFIG_DEBUGFS is not set, please see the
> > Makefile
> >
> > Ok, then you don't need to check anything.  Debugfs was created to be
> > dirt-simple, don't add complexity and "must unwind cleanly" type logic
> > here where it's not needed at all.  That just hurts my sensibilities for
> > why I made the API the way it is in the first place :)
> 
> I don't see the code much complex, it is pretty much boilerplate code and this is
> why this c&p error had happened.
> So this patch just fixes a c&p error in an error message and if we wish to change
> the behavior to match your vision
> I suggest to doing it another patch set... maybe even sweeping the whole kernel.


Greg, are you merging this patch? What is your final say?

Thanks
Tomas 

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