linux-kernel - Re: [SOLVED] Serial buffer corruption [was Re: FTDI usb-serial possible bug]

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Date:	Fri, 4 May 2007 20:46:27 +0200
From:	"Antonino Ingargiola" <tritemio@...il.com>
To:	"Paul Fulghum" <paulkf@...rogate.com>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	linux-usb-users@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [SOLVED] Serial buffer corruption [was Re: FTDI usb-serial possible bug]

On 5/4/07, Paul Fulghum <paulkf@...rogate.com> wrote:
> On Fri, 2007-05-04 at 19:25 +0200, Antonino Ingargiola wrote:
>
> > No. Ehmm ... I've an usb keybord and vga monitor on a standard desktop pc.
>
> OK, I'm stumped.
>
> I don't see how my patch could cause the machine to not boot
> and I'm not seeing that behavior here.

I can boot it hitting SysReq+K, but only in text mode. X start but I
can't do login (the mouse moves but I cant enter username and
password). Furthermore if I hit some key in GDM I can't switch to text
console anymore. If I switch to text-mode after boot all seems to
work. Maybe this is related to some important process I kill with the
SysReq key.

I'm quite confident the system blocks on "Setting consoles fonts and
modes.", and thus during the boot script console-screen.h. I'll try to
see which commands blocks...

BTW, I've tried the serial port in text mode. With the patch, flushing
the input results effectively in a complete flush. However after doing
the flush I can't read any char anymore without closing and reopening
the port. I've verified this behavior both communicating between two
serial port and both communicating with an usb-serial device (driver
cdc-acm).

Regards,

  ~ Antonio
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