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authorBoris Brezillon <boris.brezillon@free-electrons.com>2016-09-13 15:58:28 +0200
committerSasha Levin <alexander.levin@verizon.com>2016-10-05 22:40:20 -0400
commit790e65fd71e04d5a8e0cda2543e7bbbf98bc5456 (patch)
tree70060defc1a0f059afcb832c1064be17b5b099ef
parentb5937a545309b73ec6deef5b5d19d664db6236a1 (diff)
downloadlwn-790e65fd71e04d5a8e0cda2543e7bbbf98bc5456.tar.gz
lwn-790e65fd71e04d5a8e0cda2543e7bbbf98bc5456.zip
genirq: Provide irq_gc_{lock_irqsave,unlock_irqrestore}() helpers
[ Upstream commit ebf9ff753c041b296241990aef76163bbb2cc9c8 ] 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.brezillon@free-electrons.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Nicolas Ferre <nicolas.ferre@atmel.com> Cc: stable@vger.kernel.org Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com> Link: http://lkml.kernel.org/r/1473775109-4192-1-git-send-email-boris.brezillon@free-electrons.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
-rw-r--r--include/linux/irq.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index ed1135d32d80..c91ce60746f7 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -815,6 +815,16 @@ static inline void irq_gc_lock(struct irq_chip_generic *gc) { }
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)
{