From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 5 Jul 2015 17:12:35 +0000 (+0000)
Subject: x86/irq: Retrieve irq data after locking irq_desc
X-Git-Tag: omap-for-v4.2/fixes-rc2-v2~11^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=09cf92b784fae6109450c5d64f9908066d605249;p=pandora-kernel.git

x86/irq: Retrieve irq data after locking irq_desc

irq_data is protected by irq_desc->lock, so retrieving the irq chip
from irq_data outside the lock is racy vs. an concurrent update. Move
it into the lock held region.

While at it add a comment why the vector walk does not require
vector_lock.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: xiao jin <jin.xiao@intel.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Yanmin Zhang <yanmin_zhang@linux.intel.com>
Link: http://lkml.kernel.org/r/20150705171102.331320612@linutronix.de
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