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Subject: [media] gspca - ov534: Propagate errors to higher level
Author:  Jean-François Moine <[email protected]>
Date:    Thu Jan 13 05:58:04 2011 -0300

Signed-off-by: Jean-François Moine <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

 drivers/media/video/gspca/ov534.c |   21 ++++++++++++++++-----
 1 files changed, 16 insertions(+), 5 deletions(-)

---

http://git.linuxtv.org/media_tree.git?a=commitdiff;h=9519701fb79e19c43f91bd86e753c49f64ea0bf5

diff --git a/drivers/media/video/gspca/ov534.c 
b/drivers/media/video/gspca/ov534.c
index a837f29..04da228 100644
--- a/drivers/media/video/gspca/ov534.c
+++ b/drivers/media/video/gspca/ov534.c
@@ -479,6 +479,9 @@ static void ov534_reg_write(struct gspca_dev *gspca_dev, 
u16 reg, u8 val)
        struct usb_device *udev = gspca_dev->dev;
        int ret;
 
+       if (gspca_dev->usb_err < 0)
+               return;
+
        PDEBUG(D_USBO, "SET 01 0000 %04x %02x", reg, val);
        gspca_dev->usb_buf[0] = val;
        ret = usb_control_msg(udev,
@@ -486,8 +489,10 @@ static void ov534_reg_write(struct gspca_dev *gspca_dev, 
u16 reg, u8 val)
                              0x01,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0x00, reg, gspca_dev->usb_buf, 1, CTRL_TIMEOUT);
-       if (ret < 0)
+       if (ret < 0) {
                err("write failed %d", ret);
+               gspca_dev->usb_err = ret;
+       }
 }
 
 static u8 ov534_reg_read(struct gspca_dev *gspca_dev, u16 reg)
@@ -495,14 +500,18 @@ static u8 ov534_reg_read(struct gspca_dev *gspca_dev, u16 
reg)
        struct usb_device *udev = gspca_dev->dev;
        int ret;
 
+       if (gspca_dev->usb_err < 0)
+               return 0;
        ret = usb_control_msg(udev,
                              usb_rcvctrlpipe(udev, 0),
                              0x01,
                              USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0x00, reg, gspca_dev->usb_buf, 1, CTRL_TIMEOUT);
        PDEBUG(D_USBI, "GET 01 0000 %04x %02x", reg, gspca_dev->usb_buf[0]);
-       if (ret < 0)
+       if (ret < 0) {
                err("read failed %d", ret);
+               gspca_dev->usb_err = ret;
+       }
        return gspca_dev->usb_buf[0];
 }
 
@@ -563,8 +572,10 @@ static void sccb_reg_write(struct gspca_dev *gspca_dev, u8 
reg, u8 val)
        ov534_reg_write(gspca_dev, OV534_REG_WRITE, val);
        ov534_reg_write(gspca_dev, OV534_REG_OPERATION, OV534_OP_WRITE_3);
 
-       if (!sccb_check_status(gspca_dev))
+       if (!sccb_check_status(gspca_dev)) {
                err("sccb_reg_write failed");
+               gspca_dev->usb_err = -EIO;
+       }
 }
 
 static u8 sccb_reg_read(struct gspca_dev *gspca_dev, u16 reg)
@@ -885,7 +896,7 @@ static int sd_init(struct gspca_dev *gspca_dev)
        ov534_set_led(gspca_dev, 0);
        set_frame_rate(gspca_dev);
 
-       return 0;
+       return gspca_dev->usb_err;
 }
 
 static int sd_start(struct gspca_dev *gspca_dev)
@@ -920,7 +931,7 @@ static int sd_start(struct gspca_dev *gspca_dev)
 
        ov534_set_led(gspca_dev, 1);
        ov534_reg_write(gspca_dev, 0xe0, 0x00);
-       return 0;
+       return gspca_dev->usb_err;
 }
 
 static void sd_stopN(struct gspca_dev *gspca_dev)

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