linux-kernel - [PATCH] usb: gadget: f_uac1: Convert use of __constant_cpu_to_le16 to cpu_to

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Date:	Wed, 19 Aug 2015 11:01:22 +0530
From:	Vaishali Thakkar <vthakkar1994@...il.com>
To:	Felipe Balbi <balbi@...com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb: gadget: f_uac1: Convert use of __constant_cpu_to_le16
 to cpu_to_le16

In big endian cases, macro cpu_to_le16 unfolds to __swab16 which
provides special case for constants. In little endian cases,
__constant_cpu_to_le16 and cpu_to_le16 expand directly to the
same expression. So, replace __constant_cpu_to_le16 with
cpu_to_le16 with the goal of getting rid of the definition of
__constant_cpu_to_le16 completely.

The semantic patch that performs this transformation is as follows:

@@expression x;@@

- __constant_cpu_to_le16(x)
+ cpu_to_le16(x)

Signed-off-by: Vaishali Thakkar <vthakkar1994@...il.com>
---
 drivers/usb/gadget/function/f_uac1.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/function/f_uac1.c b/drivers/usb/gadget/function/f_uac1.c
index 7856b33..5aa8d8a 100644
--- a/drivers/usb/gadget/function/f_uac1.c
+++ b/drivers/usb/gadget/function/f_uac1.c
@@ -57,8 +57,8 @@ static struct uac1_ac_header_descriptor_1 ac_header_desc = {
 	.bLength =		UAC_DT_AC_HEADER_LENGTH,
 	.bDescriptorType =	USB_DT_CS_INTERFACE,
 	.bDescriptorSubtype =	UAC_HEADER,
-	.bcdADC =		__constant_cpu_to_le16(0x0100),
-	.wTotalLength =		__constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
+	.bcdADC =		cpu_to_le16(0x0100),
+	.wTotalLength =		cpu_to_le16(UAC_DT_TOTAL_LENGTH),
 	.bInCollection =	F_AUDIO_NUM_INTERFACES,
 	.baInterfaceNr = {
 	/* Interface number of the first AudioStream interface */
@@ -186,7 +186,7 @@ static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
 	.bDescriptorSubtype =	UAC_EP_GENERAL,
 	.bmAttributes = 	1,
 	.bLockDelayUnits =	1,
-	.wLockDelay =		__constant_cpu_to_le16(1),
+	.wLockDelay =		cpu_to_le16(1),
 };
 
 static struct usb_descriptor_header *f_audio_desc[] = {
-- 
1.9.1

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