V4L/DVB (13324): gspca - pac7302/pac7311: Handle return value of usb_control_msg().
The function usb_control_msg() can return error any time so at least
warn the user if an error happens. No message is printed in case of
normal operation.
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>
diff --git a/drivers/media/video/gspca/pac7302.c b/drivers/media/video/gspca/pac7302.c
index 228b414..60d1a31 100644
--- a/drivers/media/video/gspca/pac7302.c
+++ b/drivers/media/video/gspca/pac7302.c
@@ -335,14 +335,20 @@
__u8 index,
const char *buffer, int len)
{
+ int ret;
+
memcpy(gspca_dev->usb_buf, buffer, len);
- usb_control_msg(gspca_dev->dev,
+ ret = usb_control_msg(gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
1, /* request */
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, /* value */
index, gspca_dev->usb_buf, len,
500);
+ if (ret < 0)
+ PDEBUG(D_ERR, "reg_w_buf(): "
+ "Failed to write registers to index 0x%x, error %i",
+ index, ret);
}
@@ -350,13 +356,19 @@
__u8 index,
__u8 value)
{
+ int ret;
+
gspca_dev->usb_buf[0] = value;
- usb_control_msg(gspca_dev->dev,
+ ret = usb_control_msg(gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
0, /* request */
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, index, gspca_dev->usb_buf, 1,
500);
+ if (ret < 0)
+ PDEBUG(D_ERR, "reg_w(): "
+ "Failed to write register to index 0x%x, value 0x%x, error %i",
+ index, value, ret);
}
static void reg_w_seq(struct gspca_dev *gspca_dev,
@@ -373,17 +385,23 @@
const __u8 *page, int len)
{
int index;
+ int ret;
for (index = 0; index < len; index++) {
if (page[index] == SKIP) /* skip this index */
continue;
gspca_dev->usb_buf[0] = page[index];
- usb_control_msg(gspca_dev->dev,
+ ret = usb_control_msg(gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
0, /* request */
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, index, gspca_dev->usb_buf, 1,
500);
+ if (ret < 0)
+ PDEBUG(D_ERR, "reg_w_page(): "
+ "Failed to write register to index 0x%x, "
+ "value 0x%x, error %i",
+ index, page[index], ret);
}
}
diff --git a/drivers/media/video/gspca/pac7311.c b/drivers/media/video/gspca/pac7311.c
index a2f7884..82cdd43 100644
--- a/drivers/media/video/gspca/pac7311.c
+++ b/drivers/media/video/gspca/pac7311.c
@@ -263,14 +263,20 @@
__u8 index,
const char *buffer, int len)
{
+ int ret;
+
memcpy(gspca_dev->usb_buf, buffer, len);
- usb_control_msg(gspca_dev->dev,
+ ret = usb_control_msg(gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
1, /* request */
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, /* value */
index, gspca_dev->usb_buf, len,
500);
+ if (ret < 0)
+ PDEBUG(D_ERR, "reg_w_buf(): "
+ "Failed to write registers to index 0x%x, error %i",
+ index, ret);
}
@@ -278,13 +284,19 @@
__u8 index,
__u8 value)
{
+ int ret;
+
gspca_dev->usb_buf[0] = value;
- usb_control_msg(gspca_dev->dev,
+ ret = usb_control_msg(gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
0, /* request */
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, index, gspca_dev->usb_buf, 1,
500);
+ if (ret < 0)
+ PDEBUG(D_ERR, "reg_w(): "
+ "Failed to write register to index 0x%x, value 0x%x, error %i",
+ index, value, ret);
}
static void reg_w_seq(struct gspca_dev *gspca_dev,
@@ -301,17 +313,23 @@
const __u8 *page, int len)
{
int index;
+ int ret;
for (index = 0; index < len; index++) {
if (page[index] == SKIP) /* skip this index */
continue;
gspca_dev->usb_buf[0] = page[index];
- usb_control_msg(gspca_dev->dev,
+ ret = usb_control_msg(gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
0, /* request */
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, index, gspca_dev->usb_buf, 1,
500);
+ if (ret < 0)
+ PDEBUG(D_ERR, "reg_w_page(): "
+ "Failed to write register to index 0x%x, "
+ "value 0x%x, error %i",
+ index, page[index], ret);
}
}