From: Ben Hutchings <ben@decadent.org.uk>
Date: Sat, 26 Sep 2015 11:23:56 +0000 (+0100)
Subject: genirq: Fix race in register_irq_proc()
X-Git-Tag: omap-for-v4.3/fixes-rc5~43^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=95c2b17534654829db428f11bcf4297c059a2a7e;p=pandora-kernel.git

genirq: Fix race in register_irq_proc()

Per-IRQ directories in procfs are created only when a handler is first
added to the irqdesc, not when the irqdesc is created.  In the case of
a shared IRQ, multiple tasks can race to create a directory.  This
race condition seems to have been present forever, but is easier to
hit with async probing.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Link: http://lkml.kernel.org/r/1443266636.2004.2.camel@decadent.org.uk
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
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