Re: Error returns not handled correctly by sysfs.c:subsys_attr_store()

[Greg KH <greg@kroah.com>]

On Mon, Nov 26, 2007 at 08:31:16PM -0800, Andrew Morton wrote:
> On Wed, 21 Nov 2007 15:16:59 -0700 Andrew Patterson <andrew.patterson@hp.com> wrote:
> 
> > The buf in fs/sysfs.c:subsys_attr_store() does not seem to be updated
> > correctly when returning a negative value (indicating that an error
> > condition has occurred) is returned.  If a negative value is returned,
> > the next subsequent call to subsys_attr_store will have the contents of
> > buf appended to the previous call.
> 
> subsys_attr_store() gets deleted by
> http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/gregkh-01-driver/kset-kill-subsys-attr.patch
> 
> So maybe we will soon accidentally fix whatever-this-is?  Or maybe we will
> faithfully maintain it.

Yes, subsys attributes go away, but this is showing a bug in the sysfs
core with attributes, not in the "middle" layers of attributes.

I bounced the original bug report to Tejun, who has been changing the
logic around this area to see if he sees anything that might be
different now.

Tejun?

thanks,

greg k-h