From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 21 Jul 2009 09:09:39 +0000 (+0200)
Subject: genirq: Delegate irq affinity setting to the irq thread
X-Git-Tag: v2.6.31-rc4~6^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=591d2fb02ea80472d846c0b8507007806bdd69cc;p=pandora-kernel.git

genirq: Delegate irq affinity setting to the irq thread

irq_set_thread_affinity() calls set_cpus_allowed_ptr() which might
sleep, but irq_set_thread_affinity() is called with desc->lock held
and can be called from hard interrupt context as well. The code has
another bug as it does not hold a ref on the task struct as required
by set_cpus_allowed_ptr().

Just set the IRQTF_AFFINITY bit in action->thread_flags. The next time
the thread runs it migrates itself. Solves all of the above problems
nicely.

Add kerneldoc to irq_set_thread_affinity() while at it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <new-submission>
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