genirq: keep affinities set from userspace across free/request_irq()

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Impact: preserve user-modified affinities on interrupts

Kumar Galak noticed that commit
1840475676 (genirq: Expose default irq
affinity mask (take 3))

overrides an already set affinity setting across a free /
request_irq(). Happens e.g. with ifdown/ifup of a network device.

Change the logic to mark the affinities as set and keep them
intact. This also fixes the unlocked access to irq_desc in
irq_select_affinity() when called from irq_affinity_proc_write()

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Thomas Gleixner 2008-11-07 13:18:30 +01:00 • committed by Ingo Molnar

parent 8b805ef617

commit f6d87f4bd2

5 changed files with 53 additions and 28 deletions

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include/linux/irq.h

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