2007/6/27, Dmitry Torokhov <[email protected]>:
On Wednesday 27 June 2007 00:28, Greg KH wrote:
> On Wed, Jun 27, 2007 at 12:34:09AM -0400, Dmitry Torokhov wrote:
> > Hi Dave,
> >
> > On Wednesday 27 June 2007 06:59, Dave Young wrote:
> > > Hi,
> > >
> > > If you press ctrl+alt+del several times as kernel booting (before user level bootin), the kernel will oops. I found the ps2_command is called more than once, then the ps2dev->serio maybe NULL pointer.
> > >
> > > 2.6.22-rc5 and 2.6.22-rc6 have same result.
> > >
> > > Signed-off-by: Dave Young <[email protected]>
> > > ---
> > > diff -upr linux/drivers/input/keyboard/atkbd.c linux.new/drivers/input/keyboard/atkbd.c
> > > --- linux/drivers/input/keyboard/atkbd.c 2007-06-27 10:38:37.000000000 +0000
> > > +++ linux.new/drivers/input/keyboard/atkbd.c 2007-06-27 10:37:39.000000000 +0000
> > > @@ -795,6 +795,11 @@ static int atkbd_activate(struct atkbd *
> > >
> > > static void atkbd_cleanup(struct serio *serio)
> > > {
> > > + static int flag;
> > > +
> > > + if(flag)
> > > + return;
> > > + flag = 1;
> >
> > Unfortunately this will prevent atkbd from resetting keyboard on 2nd
> > suspend attempt. It will also not work if you have an active MUX and
> > have a couple of keyboards connected.
> >
> > Greg, now that you removed rwsem from subsystem (and subsystem itself
> > for that matter) there is nothing as far as I can see that stops
> > several threads from running device_shutdown() simultaneously. I also
> > do not see what would isolate device probing and shutting them down
> > at the same time. Am I missing something?
>
> There was never anything stopping that from happening before. No driver
> core code was using that rwsem, so it wasn't protecting anything,
> despite people trying to use it as if it was :)
>
It did protect device_shutdown() from itself, didn't it?
--
Dmitry
how about check ps2dev->serio in ps2_command before use it?
Regards
dave
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
