Re: 2.6.13-rc6-mm1

Jon Smirl
2005-08-21T22:11:59Z

On 8/21/05, Benoit Boissinot <benoit.boissinot@ens-lyon.org> wrote:
> On Sun, Aug 21, 2005 at 01:40:31PM -0400, Jon Smirl wrote:
> > On 8/21/05, Benoit Boissinot <bboissin@gmail.com> wrote:
> > > On 8/19/05, Andrew Morton <akpm@osdl.org> wrote:
> > > >
> > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.13-rc6/2.6.13-rc6-mm1/
> > > >
> > > > - Lots of fixes, updates and cleanups all over the place.
> > > >
> > > > - If you have the right debugging options set, this kernel will generate
> > > > a storm of sleeping-in-atomic-code warnings at boot, from the scsi code.
> > > > It is being worked on.
> > > >
> > > >
> > > > Changes since 2.6.13-rc5-mm1:
> > > > [...]
> > > > +gregkh-driver-sysfs-strip_leading_trailing_whitespace.patch
> > > > [...]
> > >
> > >
> > > it broke loading of firmware for me.(dmesg was flooded with
> > > "firmware_loading_store: unexpected value (0)")
> > >
> > > firmware.agent uses echo so there is a trailing newline. If i changes
> > > firmware.agent to uses echo -n it works correctly.
> > >
> > > Is this a bug or the correct behaviour ?
> >
> > Somewhere there is a mistake in the white space processing code of the
> > firmware driver. Before this patch we had inconsistent handling of
> > whitespace and sysfs attributes. This patch forces it to be consistent
> > and will shake out all of the places in the drivers where it is
> > handled wrong. Sysfs attributes are now stripped of leading and
> > trailing white space before being handed to the device driver.
>
> ok, i found it. If i do echo 1, it will read '1\n', will
> remove the '\n' and send '1' to ops->store.
> Then it will re-read '\n' and send '' to ops->store.
> And it will loop...

Look at the length being passed in, isn't it set to zero for the second case?

>
> Maybe sysfs should return the old count instead of ops->store ?
> >
> > Fbdev sysfs attributes are also broken for white space handling and
> > need to be fixed. Overall the patch should be correct and it is the
> > drivers that are broken.
> >
> Regards,
>
> Benoit Boissinot
>
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>

--
Jon Smirl
jonsmirl@gmail.com