Add a comment explaining the rationale behinde QT_TOKEN_IOC(req ==
NULL).
Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com>
---
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
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