[PATCH] linux: Fix CPU usage bug in console fd flushing

[Mikhail Gusarov]

Twas brillig at 16:59:54 14.11.2010 UTC+01 when thierry.vignaud at gmail.com did gyre and gimble:

 TV> From 20e32420a2f75b58603eb1578c151d63e6b2e8ac Mon Sep 17 00:00:00 2001
 TV> From: Adam Jackson <ajax at redhat.com>
 TV> Date: Wed, 25 Aug 2010 11:06:38 -0400
 TV> Subject: [PATCH] linux: Fix CPU usage bug in console fd flushing

 TV> If the vt gets a vhangup from under us, then the tty will appear ready
 TV> in select(), but trying to tcflush() it will return -EIO, so we'll spin
 TV> around at 100% CPU for no reason.  Notice this condition and unregister
 TV> the handler if it happens.

 TV> Signed-off-by: Adam Jackson <ajax at redhat.com>

Reviewed-by: Mikhail Gusarov <dottedmag at dottedmag.net>

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