V4L/DVB (13298): gspca - pac207/pac7311/mr97310a: Simplify pac_find_sof.

Remove struct sd dependency from pac_find_sof() function implementation.
This step prepares separation of pac7302 and pac7311 specific parts of
struct sd.

Signed-off-by: Marton Nemeth <nm127@freemail.hu>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/mr97310a.c

@@ -1034,9 +1034,10 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 			__u8 *data,                   /* isoc packet */
 			int len)                      /* iso packet length */
 {
+	struct sd *sd = (struct sd *) gspca_dev;
 	unsigned char *sof;
 
-	sof = pac_find_sof(gspca_dev, data, len);
+	sof = pac_find_sof(&sd->sof_read, data, len);
 	if (sof) {
 		int n;
 

drivers/media/video/gspca/pac207.c

@@ -344,7 +344,7 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 	struct sd *sd = (struct sd *) gspca_dev;
 	unsigned char *sof;
 
-	sof = pac_find_sof(gspca_dev, data, len);
+	sof = pac_find_sof(&sd->sof_read, data, len);
 	if (sof) {
 		int n;
 

drivers/media/video/gspca/pac7311.c

@@ -838,7 +838,7 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 	struct sd *sd = (struct sd *) gspca_dev;
 	unsigned char *sof;
 
-	sof = pac_find_sof(gspca_dev, data, len);
+	sof = pac_find_sof(&sd->sof_read, data, len);
 	if (sof) {
 		unsigned char tmpbuf[4];
 		int n, lum_offset, footer_length;

drivers/media/video/gspca/pac_common.h

@@ -72,42 +72,41 @@ static const unsigned char pac_sof_marker[5] =
 	   +----------+
 */
 
-static unsigned char *pac_find_sof(struct gspca_dev *gspca_dev,
+static unsigned char *pac_find_sof(u8 *sof_read,
 					unsigned char *m, int len)
 {
-	struct sd *sd = (struct sd *) gspca_dev;
 	int i;
 
 	/* Search for the SOF marker (fixed part) in the header */
 	for (i = 0; i < len; i++) {
-		switch (sd->sof_read) {
+		switch (*sof_read) {
 		case 0:
 			if (m[i] == 0xff)
-				sd->sof_read = 1;
+				*sof_read = 1;
 			break;
 		case 1:
 			if (m[i] == 0xff)
-				sd->sof_read = 2;
+				*sof_read = 2;
 			else
-				sd->sof_read = 0;
+				*sof_read = 0;
 			break;
 		case 2:
 			switch (m[i]) {
 			case 0x00:
-				sd->sof_read = 3;
+				*sof_read = 3;
 				break;
 			case 0xff:
 				/* stay in this state */
 				break;
 			default:
-				sd->sof_read = 0;
+				*sof_read = 0;
 			}
 			break;
 		case 3:
 			if (m[i] == 0xff)
-				sd->sof_read = 4;
+				*sof_read = 4;
 			else
-				sd->sof_read = 0;
+				*sof_read = 0;
 			break;
 		case 4:
 			switch (m[i]) {
@@ -117,18 +116,18 @@ static unsigned char *pac_find_sof(struct gspca_dev *gspca_dev,
 					"SOF found, bytes to analyze: %u."
 					" Frame starts at byte #%u",
 					len, i + 1);
-				sd->sof_read = 0;
+				*sof_read = 0;
 				return m + i + 1;
 				break;
 			case 0xff:
-				sd->sof_read = 2;
+				*sof_read = 2;
 				break;
 			default:
-				sd->sof_read = 0;
+				*sof_read = 0;
 			}
 			break;
 		default:
-			sd->sof_read = 0;
+			*sof_read = 0;
 		}
 	}