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>
diff --git a/drivers/media/video/gspca/sq930x.c b/drivers/media/video/gspca/sq930x.c
index 7e4381b..dd24127 100644
--- a/drivers/media/video/gspca/sq930x.c
+++ b/drivers/media/video/gspca/sq930x.c
@@ -356,12 +356,20 @@
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)