On Sat, 5 May 2012, Jiri Slaby wrote:
> On 05/05/2012 05:04 AM, Mikulas Patocka wrote:
> > Hi
> >
> > This patch reverts commit 5dd5bc40f3b6e0ccdaad948dbadc94ad0906cb25.
> >
> > The commit 5dd5bc40f3b6e0ccdaad948dbadc94ad0906cb25 causes system lockup
> > when pdc is used as a boot console.
> >
> > The kernel boots, but it locks up when transferring control to userspace
> > --- the message "INIT: version 2.86 booting" is not printed and the
> > computer halts. With the patch reverted, the system starts normally on
> > pdc.
> ...
> > --- a/arch/parisc/kernel/pdc_cons.c
> > +++ b/arch/parisc/kernel/pdc_cons.c
> ...
> > @@ -104,10 +103,8 @@ static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
> >
> > static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp)
> > {
> > - if (!tty->count) {
> > + if (!tty->count)
>
> Heh, I cannot find a bug in the patch proper. However this test is and
> always was bogus. Does changing "!tty->count" to "tty->count == 1" help?
Yes, it fixes it.
Mikulas
> > del_timer_sync(&pdc_console_timer);
> > - tty_port_tty_set(&tty_port, NULL);
> > - }
> > }
> >
> > static int pdc_console_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
>
> regards,
> --
> js
> suse labs
>
>
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