V4L/DVB: gspca - sq930x: Check the USB read errors

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

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/media/video/gspca/sq930x.c b/drivers/media/video/gspca/sq930x.c
index 7e4381bbaf28..dd24127d5168 100644
--- a/drivers/media/video/gspca/sq930x.c
+++ b/drivers/media/video/gspca/sq930x.c
@@ -356,12 +356,20 @@ static const struct cap_s {
 static void reg_r(struct gspca_dev *gspca_dev,
                 u16 value, int len)
 {
-        usb_control_msg(gspca_dev->dev,
+        int ret;
+
+        if (gspca_dev->usb_err < 0)
+                return;
+        ret = usb_control_msg(gspca_dev->dev,
                         usb_rcvctrlpipe(gspca_dev->dev, 0),
                         0x0c,
                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                         value, 0, gspca_dev->usb_buf, len,
                         500);
+        if (ret < 0) {
+                PDEBUG(D_ERR, "reg_r %04x failed %d", value, ret);
+                gspca_dev->usb_err = ret;
+        }
 }
 
 static void reg_w(struct gspca_dev *gspca_dev, u16 value, u16 index)