[patch 0/5] genirq: Distangle irq_request/release_resources() from irq_desc->lock

Thomas Gleixner tglx at linutronix.de
Thu Jun 29 14:33:34 PDT 2017

The irq_request/release_resources() callbacks are a problem on RT as they
are called under irq_desc->lock with interrupts disabled.

Aside of that calling them under irq_desc->lock is conceptually wrong and
has a (hard to trigger and probably theoretical) issue in free_irq(). See
patch 4/5 for a detailed explanation.

The series contains also a fix for the exynos gpio driver, which fiddles
with the irq masking in the resource callbacks, which is bogus and
potentially harmful.

Finally it moves the irq timings deallocation out of the spin locked region.


 drivers/pinctrl/samsung/pinctrl-exynos.c |    4 --
 include/linux/irqdesc.h                  |    3 +
 kernel/irq/irqdesc.c                     |    1 
 kernel/irq/manage.c                      |   47 +++++++++++++++++++------------
 4 files changed, 34 insertions(+), 21 deletions(-)

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