diff options
| -rw-r--r-- | common/usb.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/common/usb.c b/common/usb.c index eef4b34..10e23de 100644 --- a/common/usb.c +++ b/common/usb.c @@ -197,16 +197,21 @@ int usb_control_msg(struct usb_device *dev, unsigned int pipe, if (timeout == 0) return (int)size; - if (dev->status != 0) { - /* - * Let's wait a while for the timeout to elapse. - * It has no real use, but it keeps the interface happy. - */ - wait_ms(timeout); - return -1; + /* + * Wait for status to update until timeout expires, USB driver + * interrupt handler may set the status when the USB operation has + * been completed. + */ + while (timeout--) { + if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC)) + break; + wait_ms(1); } + if (dev->status) + return -1; return dev->act_len; + } /*------------------------------------------------------------------- |