[media] gspca - ov519: Propagate errors to higher level

Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/w996Xcf.c

@@ -59,18 +59,21 @@ static const struct v4l2_pix_format w9968cf_vga_mode[] = {
 		.colorspace = V4L2_COLORSPACE_JPEG},
 };
 
-static int reg_w(struct sd *sd, u16 index, u16 value);
+static void reg_w(struct sd *sd, u16 index, u16 value);
 
 /*--------------------------------------------------------------------------
   Write 64-bit data to the fast serial bus registers.
   Return 0 on success, -1 otherwise.
   --------------------------------------------------------------------------*/
-static int w9968cf_write_fsb(struct sd *sd, u16* data)
+static void w9968cf_write_fsb(struct sd *sd, u16* data)
 {
 	struct usb_device *udev = sd->gspca_dev.dev;
 	u16 value;
 	int ret;
 
+	if (sd->gspca_dev.usb_err < 0)
+		return;
+
 	value = *data++;
 	memcpy(sd->gspca_dev.usb_buf, data, 6);
 
@@ -79,20 +82,21 @@ static int w9968cf_write_fsb(struct sd *sd, u16* data)
 			      value, 0x06, sd->gspca_dev.usb_buf, 6, 500);
 	if (ret < 0) {
 		err("Write FSB registers failed (%d)", ret);
-		return ret;
+		sd->gspca_dev.usb_err = ret;
 	}
-
-	return 0;
 }
 
 /*--------------------------------------------------------------------------
   Write data to the serial bus control register.
   Return 0 on success, a negative number otherwise.
   --------------------------------------------------------------------------*/
-static int w9968cf_write_sb(struct sd *sd, u16 value)
+static void w9968cf_write_sb(struct sd *sd, u16 value)
 {
 	int ret;
 
+	if (sd->gspca_dev.usb_err < 0)
+		return;
+
 	/* We don't use reg_w here, as that would cause all writes when
 	   bitbanging i2c to be logged, making the logs impossible to read */
 	ret = usb_control_msg(sd->gspca_dev.dev,
@@ -105,10 +109,8 @@ static int w9968cf_write_sb(struct sd *sd, u16 value)
 
 	if (ret < 0) {
 		err("Write SB reg [01] %04x failed", value);
-		return ret;
+		sd->gspca_dev.usb_err = ret;
 	}
-
-	return 0;
 }
 
 /*--------------------------------------------------------------------------
@@ -119,6 +121,9 @@ static int w9968cf_read_sb(struct sd *sd)
 {
 	int ret;
 
+	if (sd->gspca_dev.usb_err < 0)
+		return -1;
+
 	/* We don't use reg_r here, as the w9968cf is special and has 16
 	   bit registers instead of 8 bit */
 	ret = usb_control_msg(sd->gspca_dev.dev,
@@ -126,11 +131,13 @@ static int w9968cf_read_sb(struct sd *sd)
 			1,
 			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 			0, 0x01, sd->gspca_dev.usb_buf, 2, 500);
-	if (ret >= 0)
+	if (ret >= 0) {
 		ret = sd->gspca_dev.usb_buf[0] |
 		      (sd->gspca_dev.usb_buf[1] << 8);
-	else
+	} else {
 		err("Read SB reg [01] failed");
+		sd->gspca_dev.usb_err = ret;
+	}
 
 	udelay(W9968CF_I2C_BUS_DELAY);
 
@@ -142,12 +149,12 @@ static int w9968cf_read_sb(struct sd *sd)
   This function is called by w9968cf_start_transfer().
   Return 0 on success, a negative number otherwise.
   --------------------------------------------------------------------------*/
-static int w9968cf_upload_quantizationtables(struct sd *sd)
+static void w9968cf_upload_quantizationtables(struct sd *sd)
 {
 	u16 a, b;
-	int ret = 0, i, j;
+	int i, j;
 
-	ret += reg_w(sd, 0x39, 0x0010); /* JPEG clock enable */
+	reg_w(sd, 0x39, 0x0010); /* JPEG clock enable */
 
 	for (i = 0, j = 0; i < 32; i++, j += 2) {
 		a = Y_QUANTABLE[j] | ((unsigned)(Y_QUANTABLE[j + 1]) << 8);
@@ -155,9 +162,7 @@ static int w9968cf_upload_quantizationtables(struct sd *sd)
 		reg_w(sd, 0x40 + i, a);
 		reg_w(sd, 0x60 + i, b);
 	}
-	ret += reg_w(sd, 0x39, 0x0012); /* JPEG encoder enable */
-
-	return ret;
+	reg_w(sd, 0x39, 0x0012); /* JPEG encoder enable */
 }
 
 /****************************************************************************
@@ -168,50 +173,39 @@ static int w9968cf_upload_quantizationtables(struct sd *sd)
  * i2c_adap_read_byte()                                                     *
  ****************************************************************************/
 
-static int w9968cf_smbus_start(struct sd *sd)
+static void w9968cf_smbus_start(struct sd *sd)
 {
-	int ret = 0;
-
-	ret += w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */
-	ret += w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */
-
-	return ret;
+	w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */
+	w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */
 }
 
-static int w9968cf_smbus_stop(struct sd *sd)
+static void w9968cf_smbus_stop(struct sd *sd)
 {
-	int ret = 0;
-
-	ret += w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */
-	ret += w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */
-	ret += w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
-
-	return ret;
+	w9968cf_write_sb(sd, 0x0010); /* SDE=1, SDA=0, SCL=0 */
+	w9968cf_write_sb(sd, 0x0011); /* SDE=1, SDA=0, SCL=1 */
+	w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
 }
 
-static int w9968cf_smbus_write_byte(struct sd *sd, u8 v)
+static void w9968cf_smbus_write_byte(struct sd *sd, u8 v)
 {
 	u8 bit;
-	int ret = 0, sda;
+	int sda;
 
 	for (bit = 0 ; bit < 8 ; bit++) {
 		sda = (v & 0x80) ? 2 : 0;
 		v <<= 1;
 		/* SDE=1, SDA=sda, SCL=0 */
-		ret += w9968cf_write_sb(sd, 0x10 | sda);
+		w9968cf_write_sb(sd, 0x10 | sda);
 		/* SDE=1, SDA=sda, SCL=1 */
-		ret += w9968cf_write_sb(sd, 0x11 | sda);
+		w9968cf_write_sb(sd, 0x11 | sda);
 		/* SDE=1, SDA=sda, SCL=0 */
-		ret += w9968cf_write_sb(sd, 0x10 | sda);
+		w9968cf_write_sb(sd, 0x10 | sda);
 	}
-
-	return ret;
 }
 
-static int w9968cf_smbus_read_byte(struct sd *sd, u8* v)
+static void w9968cf_smbus_read_byte(struct sd *sd, u8 *v)
 {
 	u8 bit;
-	int ret = 0;
 
 	/* No need to ensure SDA is high as we are always called after
 	   read_ack which ends with SDA high */
@@ -219,51 +213,40 @@ static int w9968cf_smbus_read_byte(struct sd *sd, u8* v)
 	for (bit = 0 ; bit < 8 ; bit++) {
 		*v <<= 1;
 		/* SDE=1, SDA=1, SCL=1 */
-		ret += w9968cf_write_sb(sd, 0x0013);
+		w9968cf_write_sb(sd, 0x0013);
 		*v |= (w9968cf_read_sb(sd) & 0x0008) ? 1 : 0;
 		/* SDE=1, SDA=1, SCL=0 */
-		ret += w9968cf_write_sb(sd, 0x0012);
+		w9968cf_write_sb(sd, 0x0012);
 	}
-
-	return ret;
 }
 
-static int w9968cf_smbus_write_nack(struct sd *sd)
+static void w9968cf_smbus_write_nack(struct sd *sd)
 {
-	int ret = 0;
-
 	/* No need to ensure SDA is high as we are always called after
 	   read_byte which ends with SDA high */
-	ret += w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
-	ret += w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
-
-	return ret;
+	w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
+	w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
 }
 
-static int w9968cf_smbus_read_ack(struct sd *sd)
+static void w9968cf_smbus_read_ack(struct sd *sd)
 {
-	int ret = 0, sda;
+	int sda;
 
 	/* Ensure SDA is high before raising clock to avoid a spurious stop */
-	ret += w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
-	ret += w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
+	w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
+	w9968cf_write_sb(sd, 0x0013); /* SDE=1, SDA=1, SCL=1 */
 	sda = w9968cf_read_sb(sd);
-	ret += w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
-	if (sda < 0)
-		ret += sda;
-	else if (sda & 0x08) {
+	w9968cf_write_sb(sd, 0x0012); /* SDE=1, SDA=1, SCL=0 */
+	if (sda >= 0 && (sda & 0x08)) {
 		PDEBUG(D_USBI, "Did not receive i2c ACK");
-		ret += -1;
+		sd->gspca_dev.usb_err = -EIO;
 	}
-
-	return ret;
 }
 
 /* SMBus protocol: S Addr Wr [A] Subaddr [A] Value [A] P */
-static int w9968cf_i2c_w(struct sd *sd, u8 reg, u8 value)
+static void w9968cf_i2c_w(struct sd *sd, u8 reg, u8 value)
 {
 	u16* data = (u16 *)sd->gspca_dev.usb_buf;
-	int ret = 0;
 
 	data[0] = 0x082f | ((sd->sensor_addr & 0x80) ? 0x1500 : 0x0);
 	data[0] |= (sd->sensor_addr & 0x40) ? 0x4000 : 0x0;
@@ -276,7 +259,7 @@ static int w9968cf_i2c_w(struct sd *sd, u8 reg, u8 value)
 	data[3] = 0x1d20 | ((sd->sensor_addr & 0x02) ? 0x0001 : 0x0);
 	data[3] |= (sd->sensor_addr & 0x01) ? 0x0054 : 0x0;
 
-	ret += w9968cf_write_fsb(sd, data);
+	w9968cf_write_fsb(sd, data);
 
 	data[0] = 0x8208 | ((reg & 0x80) ? 0x0015 : 0x0);
 	data[0] |= (reg & 0x40) ? 0x0540 : 0x0;
@@ -290,7 +273,7 @@ static int w9968cf_i2c_w(struct sd *sd, u8 reg, u8 value)
 	data[2] |= (reg & 0x01) ? 0x5400 : 0x0;
 	data[3] = 0x001d;
 
-	ret += w9968cf_write_fsb(sd, data);
+	w9968cf_write_fsb(sd, data);
 
 	data[0] = 0x8208 | ((value & 0x80) ? 0x0015 : 0x0);
 	data[0] |= (value & 0x40) ? 0x0540 : 0x0;
@@ -304,14 +287,9 @@ static int w9968cf_i2c_w(struct sd *sd, u8 reg, u8 value)
 	data[2] |= (value & 0x01) ? 0x5400 : 0x0;
 	data[3] = 0xfe1d;
 
-	ret += w9968cf_write_fsb(sd, data);
-
-	if (!ret)
-		PDEBUG(D_USBO, "i2c 0x%02x -> [0x%02x]", value, reg);
-	else
-		PDEBUG(D_ERR, "i2c 0x%02x -> [0x%02x] failed", value, reg);
+	w9968cf_write_fsb(sd, data);
 
-	return ret;
+	PDEBUG(D_USBO, "i2c 0x%02x -> [0x%02x]", value, reg);
 }
 
 /* SMBus protocol: S Addr Wr [A] Subaddr [A] P S Addr+1 Rd [A] [Value] NA P */
@@ -321,28 +299,28 @@ static int w9968cf_i2c_r(struct sd *sd, u8 reg)
 	u8 value;
 
 	/* Fast serial bus data control disable */
-	ret += w9968cf_write_sb(sd, 0x0013); /* don't change ! */
-
-	ret += w9968cf_smbus_start(sd);
-	ret += w9968cf_smbus_write_byte(sd, sd->sensor_addr);
-	ret += w9968cf_smbus_read_ack(sd);
-	ret += w9968cf_smbus_write_byte(sd, reg);
-	ret += w9968cf_smbus_read_ack(sd);
-	ret += w9968cf_smbus_stop(sd);
-	ret += w9968cf_smbus_start(sd);
-	ret += w9968cf_smbus_write_byte(sd, sd->sensor_addr + 1);
-	ret += w9968cf_smbus_read_ack(sd);
-	ret += w9968cf_smbus_read_byte(sd, &value);
+	w9968cf_write_sb(sd, 0x0013); /* don't change ! */
+
+	w9968cf_smbus_start(sd);
+	w9968cf_smbus_write_byte(sd, sd->sensor_addr);
+	w9968cf_smbus_read_ack(sd);
+	w9968cf_smbus_write_byte(sd, reg);
+	w9968cf_smbus_read_ack(sd);
+	w9968cf_smbus_stop(sd);
+	w9968cf_smbus_start(sd);
+	w9968cf_smbus_write_byte(sd, sd->sensor_addr + 1);
+	w9968cf_smbus_read_ack(sd);
+	w9968cf_smbus_read_byte(sd, &value);
 	/* signal we don't want to read anymore, the v4l1 driver used to
 	   send an ack here which is very wrong! (and then fixed
 	   the issues this gave by retrying reads) */
-	ret += w9968cf_smbus_write_nack(sd);
-	ret += w9968cf_smbus_stop(sd);
+	w9968cf_smbus_write_nack(sd);
+	w9968cf_smbus_stop(sd);
 
 	/* Fast serial bus data control re-enable */
-	ret += w9968cf_write_sb(sd, 0x0030);
+	w9968cf_write_sb(sd, 0x0030);
 
-	if (!ret) {
+	if (sd->gspca_dev.usb_err >= 0) {
 		ret = value;
 		PDEBUG(D_USBI, "i2c [0x%02X] -> 0x%02X", reg, value);
 	} else
@@ -355,29 +333,21 @@ static int w9968cf_i2c_r(struct sd *sd, u8 reg)
   Turn on the LED on some webcams. A beep should be heard too.
   Return 0 on success, a negative number otherwise.
   --------------------------------------------------------------------------*/
-static int w9968cf_configure(struct sd *sd)
+static void w9968cf_configure(struct sd *sd)
 {
-	int ret = 0;
-
-	ret += reg_w(sd, 0x00, 0xff00); /* power-down */
-	ret += reg_w(sd, 0x00, 0xbf17); /* reset everything */
-	ret += reg_w(sd, 0x00, 0xbf10); /* normal operation */
-	ret += reg_w(sd, 0x01, 0x0010); /* serial bus, SDS high */
-	ret += reg_w(sd, 0x01, 0x0000); /* serial bus, SDS low */
-	ret += reg_w(sd, 0x01, 0x0010); /* ..high 'beep-beep' */
-	ret += reg_w(sd, 0x01, 0x0030); /* Set sda scl to FSB mode */
-
-	if (ret)
-		PDEBUG(D_ERR, "Couldn't turn on the LED");
+	reg_w(sd, 0x00, 0xff00); /* power-down */
+	reg_w(sd, 0x00, 0xbf17); /* reset everything */
+	reg_w(sd, 0x00, 0xbf10); /* normal operation */
+	reg_w(sd, 0x01, 0x0010); /* serial bus, SDS high */
+	reg_w(sd, 0x01, 0x0000); /* serial bus, SDS low */
+	reg_w(sd, 0x01, 0x0010); /* ..high 'beep-beep' */
+	reg_w(sd, 0x01, 0x0030); /* Set sda scl to FSB mode */
 
 	sd->stopped = 1;
-
-	return ret;
 }
 
-static int w9968cf_init(struct sd *sd)
+static void w9968cf_init(struct sd *sd)
 {
-	int ret = 0;
 	unsigned long hw_bufsize = sd->sif ? (352 * 288 * 2) : (640 * 480 * 2),
 		      y0 = 0x0000,
 		      u0 = y0 + hw_bufsize / 2,
@@ -386,43 +356,41 @@ static int w9968cf_init(struct sd *sd)
 		      u1 = y1 + hw_bufsize / 2,
 		      v1 = u1 + hw_bufsize / 4;
 
-	ret += reg_w(sd, 0x00, 0xff00); /* power off */
-	ret += reg_w(sd, 0x00, 0xbf10); /* power on */
-
-	ret += reg_w(sd, 0x03, 0x405d); /* DRAM timings */
-	ret += reg_w(sd, 0x04, 0x0030); /* SDRAM timings */
+	reg_w(sd, 0x00, 0xff00); /* power off */
+	reg_w(sd, 0x00, 0xbf10); /* power on */
 
-	ret += reg_w(sd, 0x20, y0 & 0xffff); /* Y buf.0, low */
-	ret += reg_w(sd, 0x21, y0 >> 16);    /* Y buf.0, high */
-	ret += reg_w(sd, 0x24, u0 & 0xffff); /* U buf.0, low */
-	ret += reg_w(sd, 0x25, u0 >> 16);    /* U buf.0, high */
-	ret += reg_w(sd, 0x28, v0 & 0xffff); /* V buf.0, low */
-	ret += reg_w(sd, 0x29, v0 >> 16);    /* V buf.0, high */
+	reg_w(sd, 0x03, 0x405d); /* DRAM timings */
+	reg_w(sd, 0x04, 0x0030); /* SDRAM timings */
 
-	ret += reg_w(sd, 0x22, y1 & 0xffff); /* Y buf.1, low */
-	ret += reg_w(sd, 0x23, y1 >> 16);    /* Y buf.1, high */
-	ret += reg_w(sd, 0x26, u1 & 0xffff); /* U buf.1, low */
-	ret += reg_w(sd, 0x27, u1 >> 16);    /* U buf.1, high */
-	ret += reg_w(sd, 0x2a, v1 & 0xffff); /* V buf.1, low */
-	ret += reg_w(sd, 0x2b, v1 >> 16);    /* V buf.1, high */
+	reg_w(sd, 0x20, y0 & 0xffff); /* Y buf.0, low */
+	reg_w(sd, 0x21, y0 >> 16);    /* Y buf.0, high */
+	reg_w(sd, 0x24, u0 & 0xffff); /* U buf.0, low */
+	reg_w(sd, 0x25, u0 >> 16);    /* U buf.0, high */
+	reg_w(sd, 0x28, v0 & 0xffff); /* V buf.0, low */
+	reg_w(sd, 0x29, v0 >> 16);    /* V buf.0, high */
 
-	ret += reg_w(sd, 0x32, y1 & 0xffff); /* JPEG buf 0 low */
-	ret += reg_w(sd, 0x33, y1 >> 16);    /* JPEG buf 0 high */
+	reg_w(sd, 0x22, y1 & 0xffff); /* Y buf.1, low */
+	reg_w(sd, 0x23, y1 >> 16);    /* Y buf.1, high */
+	reg_w(sd, 0x26, u1 & 0xffff); /* U buf.1, low */
+	reg_w(sd, 0x27, u1 >> 16);    /* U buf.1, high */
+	reg_w(sd, 0x2a, v1 & 0xffff); /* V buf.1, low */
+	reg_w(sd, 0x2b, v1 >> 16);    /* V buf.1, high */
 
-	ret += reg_w(sd, 0x34, y1 & 0xffff); /* JPEG buf 1 low */
-	ret += reg_w(sd, 0x35, y1 >> 16);    /* JPEG bug 1 high */
+	reg_w(sd, 0x32, y1 & 0xffff); /* JPEG buf 0 low */
+	reg_w(sd, 0x33, y1 >> 16);    /* JPEG buf 0 high */
 
-	ret += reg_w(sd, 0x36, 0x0000);/* JPEG restart interval */
-	ret += reg_w(sd, 0x37, 0x0804);/*JPEG VLE FIFO threshold*/
-	ret += reg_w(sd, 0x38, 0x0000);/* disable hw up-scaling */
-	ret += reg_w(sd, 0x3f, 0x0000); /* JPEG/MCTL test data */
+	reg_w(sd, 0x34, y1 & 0xffff); /* JPEG buf 1 low */
+	reg_w(sd, 0x35, y1 >> 16);    /* JPEG bug 1 high */
 
-	return ret;
+	reg_w(sd, 0x36, 0x0000);/* JPEG restart interval */
+	reg_w(sd, 0x37, 0x0804);/*JPEG VLE FIFO threshold*/
+	reg_w(sd, 0x38, 0x0000);/* disable hw up-scaling */
+	reg_w(sd, 0x3f, 0x0000); /* JPEG/MCTL test data */
 }
 
-static int w9968cf_set_crop_window(struct sd *sd)
+static void w9968cf_set_crop_window(struct sd *sd)
 {
-	int ret = 0, start_cropx, start_cropy,  x, y, fw, fh, cw, ch,
+	int start_cropx, start_cropy,  x, y, fw, fh, cw, ch,
 	    max_width, max_height;
 
 	if (sd->sif) {
@@ -464,42 +432,40 @@ static int w9968cf_set_crop_window(struct sd *sd)
 	x = (max_width - cw) / 2;
 	y = (max_height - ch) / 2;
 
-	ret += reg_w(sd, 0x10, start_cropx + x);
-	ret += reg_w(sd, 0x11, start_cropy + y);
-	ret += reg_w(sd, 0x12, start_cropx + x + cw);
-	ret += reg_w(sd, 0x13, start_cropy + y + ch);
-
-	return ret;
+	reg_w(sd, 0x10, start_cropx + x);
+	reg_w(sd, 0x11, start_cropy + y);
+	reg_w(sd, 0x12, start_cropx + x + cw);
+	reg_w(sd, 0x13, start_cropy + y + ch);
 }
 
-static int w9968cf_mode_init_regs(struct sd *sd)
+static void w9968cf_mode_init_regs(struct sd *sd)
 {
-	int ret = 0, val, vs_polarity, hs_polarity;
+	int val, vs_polarity, hs_polarity;
 
-	ret += w9968cf_set_crop_window(sd);
+	w9968cf_set_crop_window(sd);
 
-	ret += reg_w(sd, 0x14, sd->gspca_dev.width);
-	ret += reg_w(sd, 0x15, sd->gspca_dev.height);
+	reg_w(sd, 0x14, sd->gspca_dev.width);
+	reg_w(sd, 0x15, sd->gspca_dev.height);
 
 	/* JPEG width & height */
-	ret += reg_w(sd, 0x30, sd->gspca_dev.width);
-	ret += reg_w(sd, 0x31, sd->gspca_dev.height);
+	reg_w(sd, 0x30, sd->gspca_dev.width);
+	reg_w(sd, 0x31, sd->gspca_dev.height);
 
 	/* Y & UV frame buffer strides (in WORD) */
 	if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat ==
 	    V4L2_PIX_FMT_JPEG) {
-		ret += reg_w(sd, 0x2c, sd->gspca_dev.width / 2);
-		ret += reg_w(sd, 0x2d, sd->gspca_dev.width / 4);
+		reg_w(sd, 0x2c, sd->gspca_dev.width / 2);
+		reg_w(sd, 0x2d, sd->gspca_dev.width / 4);
 	} else
-		ret += reg_w(sd, 0x2c, sd->gspca_dev.width);
+		reg_w(sd, 0x2c, sd->gspca_dev.width);
 
-	ret += reg_w(sd, 0x00, 0xbf17); /* reset everything */
-	ret += reg_w(sd, 0x00, 0xbf10); /* normal operation */
+	reg_w(sd, 0x00, 0xbf17); /* reset everything */
+	reg_w(sd, 0x00, 0xbf10); /* normal operation */
 
 	/* Transfer size in WORDS (for UYVY format only) */
 	val = sd->gspca_dev.width * sd->gspca_dev.height;
-	ret += reg_w(sd, 0x3d, val & 0xffff); /* low bits */
-	ret += reg_w(sd, 0x3e, val >> 16);    /* high bits */
+	reg_w(sd, 0x3d, val & 0xffff); /* low bits */
+	reg_w(sd, 0x3e, val >> 16);    /* high bits */
 
 	if (w9968cf_vga_mode[sd->gspca_dev.curr_mode].pixelformat ==
 	    V4L2_PIX_FMT_JPEG) {
@@ -507,7 +473,7 @@ static int w9968cf_mode_init_regs(struct sd *sd)
 		jpeg_define(sd->jpeg_hdr, sd->gspca_dev.height,
 			    sd->gspca_dev.width, 0x22); /* JPEG 420 */
 		jpeg_set_qual(sd->jpeg_hdr, sd->quality);
-		ret += w9968cf_upload_quantizationtables(sd);
+		w9968cf_upload_quantizationtables(sd);
 	}
 
 	/* Video Capture Control Register */
@@ -539,11 +505,9 @@ static int w9968cf_mode_init_regs(struct sd *sd)
 
 	val |= 0x8000; /* capt. enable */
 
-	ret += reg_w(sd, 0x16, val);
+	reg_w(sd, 0x16, val);
 
 	sd->gspca_dev.empty_packet = 0;
-
-	return ret;
 }
 
 static void w9968cf_stop0(struct sd *sd)