of/irq: Fix device node refcount leakages in of_irq_count()

commit bbf71f44aaf241d853759a71de7e7ebcdb89be3d upstream.

of_irq_count() invokes of_irq_parse_one() to count IRQs, and successful
invocation of the later will get device node @irq.np refcount, but the
former does not put the refcount before next iteration invocation, hence
causes device node refcount leakages.

Fix by putting @irq.np refcount before the next iteration invocation.

Fixes: 3da5278 ("of/irq: Rework of_irq_count()")
Cc: [email protected]
Signed-off-by: Zijun Hu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring (Arm) <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
(cherry picked from commit 29cb94963ca9dce389e02047199db2f7cfaaa23e)
Signed-off-by: Jack Vogel <[email protected]>

Author: zijun-hu

drivers/of/irq.c

@@ -508,8 +508,10 @@ int of_irq_count(struct device_node *dev)
 	struct of_phandle_args irq;
 	int nr = 0;
 
-	while (of_irq_parse_one(dev, nr, &irq) == 0)
+	while (of_irq_parse_one(dev, nr, &irq) == 0) {
+		of_node_put(irq.np);
 		nr++;
+	}
 
 	return nr;
 }