Re: yenta-socket oops with 2.5.73-mm3, 2.5.74, 2.5.74-mm1

[Michael Frank <mflt1@micrologica.com.hk>]

Applied both patches without offsets.

Did 20 halt cycles with e100 loaded - no oopses. Seems to
be fixed. 

The oops without e100 seems to be fixed too but needs more 
watching as it's probability increases when power is off for 
longer than the short time in above test where power is switched
on again within a few seconds after the halt.

Regards
Michael


On Monday 07 July 2003 06:15, Russell King wrote:
> On Sun, Jul 06, 2003 at 12:39:34AM +0200, Daniel Ritz wrote:
> > problem is that an interrupt arrives before socket->thread_wait is
> > initialized so we crash in __wake_up_common. i think source of the
> > interrupt is socket_init called before the initialization. but an
> > interrupt can still arrive before...
>
> I suspect that even with your patch below, there is the posibility
> to receive an unintentional call into pcmcia_parse_events() from some
> socket drivers.  The all round better fix is to make pcmcia_parse_events()
> ignore socket change events until the socket thread is up and running.
>
> Nevertheless, the patch looks correct, so I am still interested in
> whether your patch helps solve Michael's problem.
>
> > michael, can you try this one?
>
> Daniel's patch:
>
> --- 1.50/drivers/pcmcia/cs.c	Mon Jun 30 22:22:30 2003
> +++ edited/cs.c	Sat Jul  5 23:58:07 2003
> @@ -338,13 +338,13 @@
>  	socket->erase_busy.next = socket->erase_busy.prev = &socket->erase_busy;
>  	INIT_LIST_HEAD(&socket->cis_cache);
>  	spin_lock_init(&socket->lock);
> -
> -	init_socket(socket);
> -
>  	init_completion(&socket->thread_done);
>  	init_waitqueue_head(&socket->thread_wait);
>  	init_MUTEX(&socket->skt_sem);
>  	spin_lock_init(&socket->thread_lock);
> +
> +	init_socket(socket);
> +
>  	ret = kernel_thread(pccardd, socket, CLONE_KERNEL);
>  	if (ret < 0)
>  		return ret;
>
> and my patch (may apply with some offset, which I'm about to check
> into bk anyway):
>
> --- linux/drivers/pcmcia/cs.c.old	Fri Jul  4 10:21:50 2003
> +++ linux/drivers/pcmcia/cs.c	Sun Jul  6 23:04:10 2003
> @@ -870,11 +870,13 @@
>
>  void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
>  {
> -	spin_lock(&s->thread_lock);
> -	s->thread_events |= events;
> -	spin_unlock(&s->thread_lock);
> +	if (s->thread) {
> +		spin_lock(&s->thread_lock);
> +		s->thread_events |= events;
> +		spin_unlock(&s->thread_lock);
>
> -	wake_up(&s->thread_wait);
> +		wake_up(&s->thread_wait);
> +	}
>  } /* pcmcia_parse_events */

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