From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@osdl.org>
Subject: Re: [Bugme-new] [Bug 6530] New: MAINLINE
Date: Wed, 10 May 2006 21:06:25 -0700
Message-ID: <20060510210625.7fa413e6.akpm@osdl.org>
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	xeb@mail.ru
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To: Paul Mackerras <paulus@samba.org>
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Paul Mackerras <paulus@samba.org> wrote:
>
> Andrew Morton writes:
> 
> > xeb has said:
> > 
> > in this construction:
> > 
> >           if ((test_bit(XMIT_WAKEUP, &ap->xmit_flags) ||
> >              test_bit(XMIT_FULL, &ap->xmit_flags)) && ppp_async_push(ap))
> >                   ppp_output_wakeup(&ap->chan);
> > 
> > if ppp_async_push() doesn't send any data i.e.  XMIT_FULL is set then all
> > (transfer) hangs up while somebody push again, for instance lcp-echo.  
> 
> If XMIT_FULL and ppp_async_push doesn't send any data, that means the
> serial driver's output buffer was full.  If that's the case, *and* we
> don't see a call to ppp_output_wakeup, then the finger points squarely
> at the serial driver as the source of the bug.
> 

OK, thanks.  So the next question is: which driver is being used?