4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Boris Brezillon <boris.brezil...@free-electrons.com> commit ebf9ff753c041b296241990aef76163bbb2cc9c8 upstream. Some irqchip drivers need to take the generic chip lock outside of the irq context. Provide the irq_gc_{lock_irqsave,unlock_irqrestore}() helpers to allow one to disable irqs while entering a critical section protected by gc->lock. Note that we do not provide optimized version of these helpers for !SMP, because they are not called from the hot-path. [ tglx: Added a comment when these helpers should be [not] used ] Signed-off-by: Boris Brezillon <boris.brezil...@free-electrons.com> Cc: Jason Cooper <ja...@lakedaemon.net> Cc: Marc Zyngier <marc.zyng...@arm.com> Cc: Nicolas Ferre <nicolas.fe...@atmel.com> Cc: Alexandre Belloni <alexandre.bell...@free-electrons.com> Link: http://lkml.kernel.org/r/1473775109-4192-1-git-send-email-boris.brezil...@free-electrons.com Signed-off-by: Thomas Gleixner <t...@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- include/linux/irq.h | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -916,6 +916,16 @@ static inline void irq_gc_lock(struct ir static inline void irq_gc_unlock(struct irq_chip_generic *gc) { } #endif +/* + * The irqsave variants are for usage in non interrupt code. Do not use + * them in irq_chip callbacks. Use irq_gc_lock() instead. + */ +#define irq_gc_lock_irqsave(gc, flags) \ + raw_spin_lock_irqsave(&(gc)->lock, flags) + +#define irq_gc_unlock_irqrestore(gc, flags) \ + raw_spin_unlock_irqrestore(&(gc)->lock, flags) + static inline void irq_reg_writel(struct irq_chip_generic *gc, u32 val, int reg_offset) {