linux-kernel - Re: fix oops on cat /dev/snapshot

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Message-ID: <20070611143219.GA1759@elf.ucw.cz>
Date:	Mon, 11 Jun 2007 16:32:19 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	B.Steinbrink@....de, Andrew Morton <akpm@...l.org>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: fix oops on cat /dev/snapshot

Hi!

> > What /dev/snapshot is simply cat-ed -- without ioctls used in normal
> > operation -- it oopses. This one should fix it.
> > 
> > Signed-off-by: Pavel Machek <pavel@...e.cz>
> > 
> > --- clean-mm/kernel/power/user.c	2007-06-09 16:18:12.000000000 +0200
> > +++ linux-mm/kernel/power/user.c	2007-06-11 14:06:19.000000000 +0200
> > @@ -99,6 +99,8 @@
> >  	ssize_t res;
> >  
> >  	data = filp->private_data;
> > +	if (!data->ready)
> > +		return -EINVAL;
> 
> I'd like to use -ENODATA here.
> 
> >  	res = snapshot_read_next(&data->handle, count);
> >  	if (res > 0) {
> >  		if (copy_to_user(buf, data_of(data->handle), res))
> > 
> 
> I have a patch for that and I'm going to post it in a while if you don't
> mind.
> 
> I've already posted it once, here: http://lkml.org/lkml/2007/6/10/146

Aha, go ahead, I did not notice that mail.
										Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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