linux-kernel - Re: udev breakages - was: Re: Need of an ".async_probe()" type of callback at driver's core - Was: Re: [PATCH] [media] drxk: change it to use request_firmware

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Message-ID: <20121003192636.GC23473@ZenIV.linux.org.uk>
Date:	Wed, 3 Oct 2012 20:26:36 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Ming Lei <ming.lei@...onical.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Kay Sievers <kay@...y.org>,
	Lennart Poettering <lennart@...ttering.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kay Sievers <kay@...hat.com>,
	Linux Media Mailing List <linux-media@...r.kernel.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Ivan Kalvachev <ikalvachev@...il.com>
Subject: Re: udev breakages - was: Re: Need of an ".async_probe()" type of
 callback at driver's core - Was: Re: [PATCH] [media] drxk: change it to use
 request_firmware_nowait()

On Wed, Oct 03, 2012 at 10:32:08AM -0700, Linus Torvalds wrote:
> On Wed, Oct 3, 2012 at 10:09 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
> >
> > +       if (!S_ISREG(inode->i_mode))
> > +               return false;
> > +       size = i_size_read(inode);
> >
> > Probably better to do vfs_getattr() and check mode and size in kstat; if
> > it's sufficiently hot for that to hurt, we are fucked anyway.
> >
> > +               file = filp_open(path, O_RDONLY, 0);
> > +               if (IS_ERR(file))
> > +                       continue;
> > +printk("from file '%s' ", path);
> > +               success = fw_read_file_contents(file, fw);
> > +               filp_close(file, NULL);
> >
> > fput(file), please.  We have enough misuses of filp_close() as it is...
> 
> Ok, like this?

Looks sane.  TBH, I'd still prefer to see udev forcibly taken over and put into
usr/udev in kernel tree - I don't trust that crowd at all and the fewer
critical userland bits they can play leverage games with, the safer we are.  

Al, that -><- close to volunteering for maintaining that FPOS kernel-side...
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