From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 12 Mar 2010 16:34:14 +0000 (+0100)
Subject: clockevents: Sanitize min_delta_ns adjustment and prevent overflows
X-Git-Tag: v2.6.34-rc3~22^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=80a05b9ffa7dc13f6693902dd8999a2b61a3a0d7;p=pandora-kernel.git

clockevents: Sanitize min_delta_ns adjustment and prevent overflows

The current logic which handles clock events programming failures can
increase min_delta_ns unlimited and even can cause overflows.

Sanitize it by:
 - prevent zero increase when min_delta_ns == 1
 - limiting min_delta_ns to a jiffie
 - bail out if the jiffie limit is hit
 - add retries stats for /proc/timer_list so we can gather data

Reported-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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