Re: Problems with PCMCIA (Texas Instruments PCI1450)

[Daniel Ritz]

On Fri September 5 2003 21:54, Russell King wrote:
> On Fri, Sep 05, 2003 at 09:40:27PM +0200, Daniel Ritz wrote:
> > On Fri September 5 2003 20:38, Russell King wrote:
> > > On Fri, Sep 05, 2003 at 08:19:28PM +0200, Daniel Ritz wrote:
> > > > ok, now i can reproduce the problem on my ti1410 too. on boot detection
> > > > works fine with an UP kernel and fails with an SMP kernel. thanx for the
> > > > hint.
> > > > 
> > > > i go to look at the csets a bit and try to find out more....
> > > > (i think i know which change...)
> > > 
> > > Care to provide a hint?
> > 
> > yes. just tested. patch below makes on boot detection with a SMP kernel
> > working again (for me). which is nice, but i don't see why it is better
> > that way...
> 
> Ok, now I need to hear from Sven (and others) to see if this patch fixes
> their problems.  Also, are these other people running a SMP kernel as
> well?
> 
> Meanwhile, I'm wondering if we have a timing problem here.  Can you check
> whether adding a mdelay(1) just after the BUG_ON in the original code
> fixes the problem?

no effect. i tried that before with loooong sleeps (1 second) w/o any effect...

> 
> > ===== cs.c 1.56 vs edited =====
> > --- 1.56/drivers/pcmcia/cs.c	Sun Aug  3 14:48:43 2003
> > +++ edited/cs.c	Fri Sep  5 21:42:09 2003
> > @@ -316,7 +316,6 @@
> >  
> >  	wait_for_completion(&socket->thread_done);
> >  	BUG_ON(!socket->thread);
> > -	pcmcia_parse_events(socket, SS_DETECT);
> >  
> >  	return 0;
> >  }
> > @@ -1524,6 +1523,9 @@
> >      if (client == NULL)
> >  	return CS_OUT_OF_RESOURCE;
> >  
> > +    if (++s->real_clients == 1)
> > +	pcmcia_parse_events(s, SS_DETECT);
> > +    
> >      *handle = client;
> >      client->state &= ~CLIENT_UNBOUND;
> >      client->Socket = s;
> > 
> 
> -- 
> Russell King (rmk@xxxxxxxxxxxxxxxx)	http://www.arm.linux.org.uk/personal/
> Linux kernel maintainer of:
>   2.6 ARM Linux   - http://www.arm.linux.org.uk/
>   2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
>   2.6 Serial core
> 
> 

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