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5234ffb9f7
linux/kernel/irq
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Alexander Gordeev 5234ffb9f7 genirq: Get rid of unnecessary IRQTF_DIED flag 
Currently IRQTF_DIED flag is set when a IRQ thread handler calls do_exit()
But also PF_EXITING per process flag gets set when a thread exits. This
fix eliminates the duplicate by using PF_EXITING flag.

Also, there is a race condition in exit_irq_thread(). In case a thread's
bit is cleared in desc->threads_oneshot (and the IRQ line gets unmasked),
but before IRQTF_DIED flag is set, a new interrupt might come in and set
just cleared bit again, this time forever. This fix throws IRQTF_DIED flag
away, eliminating the race as a result.

[ tglx: Test THREAD_EXITING first as suggested by Oleg ]

Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Link: http://lkml.kernel.org/r/20120309135958.GD2114@dhcp-26-207.brq.redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2012-03-09 17:19:09 +01:00
..
autoprobe.c genirq: Remove compat code 2011-03-29 14:48:19 +02:00
chip.c genirq: Fix long-term regression in genirq irq_set_irq_type() handling 2012-03-06 13:33:27 +01:00
debug.h genirq: Support per-IRQ thread disabling. 2011-04-23 15:56:24 +02:00
devres.c devres: fix possible use after free 2011-07-25 20:57:14 -07:00
dummychip.c genirq: Remove compat code 2011-03-29 14:48:19 +02:00
generic-chip.c kernel: Fix files explicitly needing EXPORT_SYMBOL infrastructure 2011-10-31 19:30:05 -04:00
handle.c genirq: Get rid of unnecessary IRQTF_DIED flag 2012-03-09 17:19:09 +01:00
internals.h genirq: Get rid of unnecessary IRQTF_DIED flag 2012-03-09 17:19:09 +01:00
irqdesc.c irq: don't put module.h into irq.h for tracking irqgen modules. 2011-10-31 19:32:35 -04:00
irqdomain.c devicetree/next changes queued for v3.3 merge window 2012-01-07 12:18:52 -08:00
Kconfig irq: add irq_domain translation infrastructure 2011-07-28 01:32:04 -06:00
Makefile irq: add irq_domain translation infrastructure 2011-07-28 01:32:04 -06:00
manage.c genirq: Get rid of unnecessary IRQTF_DIED flag 2012-03-09 17:19:09 +01:00
migration.c Fix common misspellings 2011-03-31 11:26:23 -03:00
pm.c genirq: Add IRQF_RESUME_EARLY and resume such IRQs earlier 2011-10-17 11:42:49 +02:00
proc.c irq: Remove smp_affinity_list when unregister irq proc 2011-05-26 13:15:28 +02:00
resend.c genirq: Remove compat code 2011-03-29 14:48:19 +02:00
settings.h genirq: Add support for per-cpu dev_id interrupts 2011-10-03 15:35:26 +02:00
spurious.c module_param: make bool parameters really bool (core code) 2012-01-13 09:32:18 +10:30