diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 5b3b9062f..2a0038931 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -819,8 +819,17 @@ int submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer, int length, int interval) { - debug("dev=%p, pipe=%lu, buffer=%p, length=%d, interval=%d", dev, pipe, buffer, length, interval); + + /* + * Interrupt transfers requiring several transactions are not supported + * because bInterval is ignored. + */ + if (length > usb_maxpacket(dev, pipe)) { + printf("%s: Interrupt transfers requiring several transactions " + "are not supported.\n", __func__); + return -1; + } return ehci_submit_async(dev, pipe, buffer, length, NULL); } |