linux-kernel - Re: [PATCH] hvc_console: fix dropping of characters when output byte channel is full

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Date:	Tue, 14 Sep 2010 14:25:34 -0500
From:	Timur Tabi <timur@...escale.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
	kumar.gala@...escale.com, amit.shah@...hat.com
Subject: Re: [PATCH] hvc_console: fix dropping of characters when output byte
 channel is full

Alan Cox wrote:
> Its a printk handler - better to lose the bytes than hang the box. I
> think the current code is probably right.

What do you think about this change:

http://lists.ozlabs.org/pipermail/linuxppc-dev/2009-October/thread.html#76830

This is the original version of my patch.  In it, I simply allow drivers to
return 0 to indicate that they're too busy to accept data.  It works great
on the hvc driver that we have in-house today, but it might break other
drivers that return 0 to indicate error.

-- 
Timur Tabi
Linux kernel developer at Freescale

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