genirq: Do not copy affinity before set

While rumaging through arch code I found that there are a few
workarounds which deal with the fact that the initial affinity setting
from request_irq() copies the mask into irq_data->affinity before the
chip code is called. In the normal path we unconditionally copy the
mask when the chip code returns 0.

Copy after the code is called and add a return code
IRQ_SET_MASK_OK_NOCOPY for the chip functions, which prevents the
copy. That way we see the real mask when the chip function decided to
truncate it further as some arches do. IRQ_SET_MASK_OK is 0, which is
the current behaviour.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/irq.h b/include/linux/irq.h
index e9f847d56c4d..f5e900309d21 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -85,6 +85,17 @@ typedef	void (*irq_flow_handler_t)(unsigned int irq,
 # define IRQ_NO_BALANCING_MASK  IRQ_NO_BALANCING
 #endif
 
+/*
+ * Return value for chip->irq_set_affinity()
+ *
+ * IRQ_SET_MASK_OK      - OK, core updates irq_data.affinity
+ * IRQ_SET_MASK_NOCPY   - OK, chip did update irq_data.affinity
+ */
+enum {
+        IRQ_SET_MASK_OK = 0,
+        IRQ_SET_MASK_OK_NOCOPY,
+};
+
 struct msi_desc;
 
 /**