From: Ian Abbott <abbotti@mev.co.uk>
Date: Mon, 15 Oct 2012 12:07:31 +0000 (+0100)
Subject: staging: comedi: avoid a put_device(), get_device() sequence
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0a7717dfe097d7a0a08e824ed39547c3e6e9d7e8;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

staging: comedi: avoid a put_device(), get_device() sequence

In `comedi_set_hw_dev()`, if there is no change to `dev->hw_dev` (and it
is not `NULL`), don't bother putting and getting the device.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
index cb67a5cb9c82..100ea0b0772c 100644
--- a/drivers/staging/comedi/comedidev.h
+++ b/drivers/staging/comedi/comedidev.h
@@ -436,9 +436,10 @@ into comedi's buffer */
 static inline void comedi_set_hw_dev(struct comedi_device *dev,
 				     struct device *hw_dev)
 {
+	if (dev->hw_dev == hw_dev)
+		return;
 	if (dev->hw_dev)
 		put_device(dev->hw_dev);
-
 	dev->hw_dev = hw_dev;
 	if (dev->hw_dev) {
 		dev->hw_dev = get_device(dev->hw_dev);