[Xen-devel] [48/54] irq: Add new IRQ flag IRQF_NO_SUSPEND

[Greg KH <gregkh@xxxxxxx>]

2.6.34-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Ian Campbell <ian.campbell@xxxxxxxxxx>

commit 685fd0b4ea3f0f1d5385610b0d5b57775a8d5842 upstream.

A small number of users of IRQF_TIMER are using it for the implied no
suspend behaviour on interrupts which are not timer interrupts.

Therefore add a new IRQF_NO_SUSPEND flag, rename IRQF_TIMER to
__IRQF_TIMER and redefine IRQF_TIMER in terms of these new flags.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: linux-input@xxxxxxxxxxxxxxx
Cc: linuxppc-dev@xxxxxxxxxx
Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
LKML-Reference: <1280398595-29708-1-git-send-email-ian.campbell@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 include/linux/interrupt.h |    7 ++++++-
 kernel/irq/manage.c       |    2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -52,16 +52,21 @@
  * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler 
finished.
  *                Used by threaded interrupts which need to keep the
  *                irq line disabled until the threaded handler has been run.
+ * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend
+ *
  */
 #define IRQF_DISABLED          0x00000020
 #define IRQF_SAMPLE_RANDOM     0x00000040
 #define IRQF_SHARED            0x00000080
 #define IRQF_PROBE_SHARED      0x00000100
-#define IRQF_TIMER             0x00000200
+#define __IRQF_TIMER           0x00000200
 #define IRQF_PERCPU            0x00000400
 #define IRQF_NOBALANCING       0x00000800
 #define IRQF_IRQPOLL           0x00001000
 #define IRQF_ONESHOT           0x00002000
+#define IRQF_NO_SUSPEND                0x00004000
+
+#define IRQF_TIMER             (__IRQF_TIMER | IRQF_NO_SUSPEND)
 
 /*
  * Bits used by threaded handlers:
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -200,7 +200,7 @@ static inline int setup_affinity(unsigne
 void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
 {
        if (suspend) {
-               if (!desc->action || (desc->action->flags & IRQF_TIMER))
+               if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND))
                        return;
                desc->status |= IRQ_SUSPENDED;
        }



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