linux-kernel - Re: [PATCH 2/2] usb_serial: only allow sysrq on a console port

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Date:	Mon, 6 Jul 2009 01:33:41 -0400
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	"Mike Frysinger" <vapier.adi@...il.com>
CC:	"Alan Cox" <alan@...rguk.ukuu.org.uk>, greg@...ah.com,
	"Jason Wessel" <jason.wessel@...driver.com>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/2] usb_serial: only allow sysrq on a console port

On Mon 6 Jul 2009 00:56, Mike Frysinger pondered:
> On Mon, Jul 6, 2009 at 00:38, Robin Getz wrote:
> > It appears that the usb serial doesn't handle breaks like serial_core
> > does. (I  don't see any support for SAK in usb_serial either?)
> >
> > Maybe _that_ is the real problem that Jason is trying to work around???
> 
> perhaps, but what Jason proposed originally sounds pretty sane.

Which is why Greg added it to the USB tree, and it is in 2.6.31-rc2 :)

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=568d422e9cf52b7b26d2e026ae1617971f62b560

> if i 
> enable sysrq support on my desktop, i dont want some development board
> being able to send a sysrq request back over my serial port and
> rebooting my desktop.

Fixing something in the wrong place -- while noble -- is still wrong :)

However -- with the way that usb serial is structured - I didn't see a better 
place right now either.

The point being that is would be nice to make usb serial look more like other 
serial devices - so they can share mode code - and things like this (that 
have been in serial_core.h since -pre-git history (2005) wouldn't just be 
getting added to the usb serial infrastructure now)...



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