V4L/DVB (5392): Zr364xx: Use kernel's byte-swapping function

Some code to swap bytes wasn't using the swab16() function that the
kernel provides for this.  Make use of it, which results in more
efficient code.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Acked-by: Antoine Jacquet <royale@zerezo.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 6 insertions, 7 deletions

diff --git a/drivers/media/video/zr364xx.c b/drivers/media/video/zr364xx.c
index 16bb3576b6ea..b5d3364c94c7 100644
--- a/drivers/media/video/zr364xx.c
+++ b/drivers/media/video/zr364xx.c
@@ -277,7 +277,7 @@ static unsigned char header3;
 static int read_frame(struct zr364xx_camera *cam, int framenum)
 {
         int i, n, temp, head, size, actual_length;
-        unsigned char *ptr = NULL, *jpeg, swap;
+        unsigned char *ptr = NULL, *jpeg;
 
       redo:
         /* hardware brightness */
@@ -308,12 +308,11 @@ static int read_frame(struct zr364xx_camera *cam, int framenum)
                 }
 
                 /* swap bytes if camera needs it */
-                if (cam->method == METHOD0)
-                        for (i = 0; i < BUFFER_SIZE; i += 2) {
-                                swap = cam->buffer[i];
-                                cam->buffer[i] = cam->buffer[i + 1];
-                                cam->buffer[i + 1] = swap;
-                        }
+                if (cam->method == METHOD0) {
+                        u16 *buf = (u16*)cam->buffer;
+                        for (i = 0; i < BUFFER_SIZE/2; i++)
+                                swab16s(buf + i);
+                }
 
                 /* write the JPEG header */
                 if (!head) {