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authorRussell King <rmk+kernel@arm.linux.org.uk>2015-06-17 01:06:20 +0300
committerThomas Gleixner <tglx@linutronix.de>2015-06-18 15:03:08 +0300
commit3b0f95be143bea1aa47beb20134ef82e4e4068dc (patch)
tree730822397420dd40a9cf50d8b3bc26e829522ef5 /include/linux/irq.h
parent6fd4899a54a522ccd6a24fea2318d3b515b95945 (diff)
downloadlinux-3b0f95be143bea1aa47beb20134ef82e4e4068dc.tar.xz
irq: Add irq_set_chained_handler_and_data()
Driver authors seem to get the ordering of irq_set_chained_handler() and irq_set_handler_data() wrong - ordering the former before the latter. This opens a race window where, if there is an interrupt pending, the handler will be called between these two calls, potentially resulting in an oops. Provide a single interface to set both of these together, especially as that's commonly what is required. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Alexandre Courbot <gnurou@gmail.com> Cc: Hans Ulli Kroll <ulli.kroll@googlemail.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Lee Jones <lee.jones@linaro.org> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/E1Z4yzs-0002Rw-4B@rmk-PC.arm.linux.org.uk Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/irq.h')
-rw-r--r--include/linux/irq.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index de3213d271ff..42861d28fc2a 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -525,6 +525,15 @@ irq_set_chained_handler(unsigned int irq, irq_flow_handler_t handle)
__irq_set_handler(irq, handle, 1, NULL);
}
+/*
+ * Set a highlevel chained flow handler and its data for a given IRQ.
+ * (a chained handler is automatically enabled and set to
+ * IRQ_NOREQUEST, IRQ_NOPROBE, and IRQ_NOTHREAD)
+ */
+void
+irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
+ void *data);
+
void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);
static inline void irq_set_status_flags(unsigned int irq, unsigned long set)