genirq: Delegate irq affinity setting to the irq thread

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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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Thomas Gleixner 2009-07-21 11:09:39 +02:00

parent aea1f7964a

commit 591d2fb02e

4 changed files with 48 additions and 9 deletions

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include/linux/interrupt.h

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