Add a comment explaining the rationale behinde QT_TOKEN_IOC(req == NULL). Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx> --- drivers/usb/host/ehci-hcd.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index f0d899e82..a6f497925 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -362,6 +362,15 @@ ehci_submit_async(struct usb_device *dev, unsigned long pipe, void *buffer, ret = ehci_prepare_qtd(ehci->dev, td, QT_TOKEN_DT(toggle) | + /* + * We only want this qTD to + * generate an interrupt if + * this is a BULK + * request. Otherwise, we'll + * rely on following status + * stage qTD's IOC to notify us + * that transfer is complete + */ QT_TOKEN_IOC(req == NULL) | QT_TOKEN_PID(pid), buffer, length, -- 2.21.0 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
