Re: [Kgdb-bugreport] [PATCH 2.6.20-rc7] 8139too KGDBoE fix

[Sergei S. <ssh...@ru...>]

Hello.

Sergei Shtylyov wrote:
> This patch gets rid of annoying (and seemingly unavoidable) messages emitted
> by the 8139too driver when using it for KGDBoE.  It also makes KGDBoE work at
> least somehow on my PowerPC board -- without it cross-gdb just doesn't connect.

> Signed-off-by: Sergei Shtylyov <ssh...@ru...>

> ---
> Even with this patch, the packets probably get stuck somewhere in the driver,
> as cross-gdb sees tail of the $g packet reply only in reply to next packet...

    Argh! That's all because of the CONFIG_NETPOLL_TRAP that CONFIG_KGDBOE* 
options select -- since the initial breakpoint enables trapping via KGDBoE's 
pre_exception() handler, netif_{stop/wake}_queue() stop to work and that 
causes KGDBoE to literally flood 8139too with packets (although it can't queue 
up more than 4). Looks like a general design issue to me... :-/

WBR, Sergei