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Diffstat (limited to 'sound/usb/line6/driver.c')
-rw-r--r--sound/usb/line6/driver.c29
1 files changed, 23 insertions, 6 deletions
diff --git a/sound/usb/line6/driver.c b/sound/usb/line6/driver.c
index 2f9b74e7accb..f2ee8046271a 100644
--- a/sound/usb/line6/driver.c
+++ b/sound/usb/line6/driver.c
@@ -297,6 +297,7 @@ static void line6_data_received(struct urb *urb)
}
#define LINE6_READ_WRITE_STATUS_DELAY 2 /* milliseconds */
+#define LINE6_READ_WRITE_MAX_RETRIES 50
/*
Read data from device.
@@ -307,6 +308,7 @@ int line6_read_data(struct usb_line6 *line6, int address, void *data,
struct usb_device *usbdev = line6->usbdev;
int ret;
unsigned char len;
+ unsigned count;
/* query the serial number: */
ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
@@ -320,7 +322,7 @@ int line6_read_data(struct usb_line6 *line6, int address, void *data,
}
/* Wait for data length. We'll get 0xff until length arrives. */
- do {
+ for (count = 0; count < LINE6_READ_WRITE_MAX_RETRIES; count++) {
mdelay(LINE6_READ_WRITE_STATUS_DELAY);
ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
@@ -333,9 +335,16 @@ int line6_read_data(struct usb_line6 *line6, int address, void *data,
"receive length failed (error %d)\n", ret);
return ret;
}
- } while (len == 0xff);
- if (len != datalen) {
+ if (len != 0xff)
+ break;
+ }
+
+ if (len == 0xff) {
+ dev_err(line6->ifcdev, "read failed after %d retries\n",
+ count);
+ return -EIO;
+ } else if (len != datalen) {
/* should be equal or something went wrong */
dev_err(line6->ifcdev,
"length mismatch (expected %d, got %d)\n",
@@ -367,6 +376,7 @@ int line6_write_data(struct usb_line6 *line6, int address, void *data,
struct usb_device *usbdev = line6->usbdev;
int ret;
unsigned char status;
+ int count;
ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
@@ -379,7 +389,7 @@ int line6_write_data(struct usb_line6 *line6, int address, void *data,
return ret;
}
- do {
+ for (count = 0; count < LINE6_READ_WRITE_MAX_RETRIES; count++) {
mdelay(LINE6_READ_WRITE_STATUS_DELAY);
ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
@@ -394,9 +404,16 @@ int line6_write_data(struct usb_line6 *line6, int address, void *data,
"receiving status failed (error %d)\n", ret);
return ret;
}
- } while (status == 0xff);
- if (status != 0) {
+ if (status != 0xff)
+ break;
+ }
+
+ if (status == 0xff) {
+ dev_err(line6->ifcdev, "write failed after %d retries\n",
+ count);
+ return -EIO;
+ } else if (status != 0) {
dev_err(line6->ifcdev, "write failed (error %d)\n", ret);
return -EINVAL;
}