We found when we plug in/out usb3.0 device for stress testing, once
usb_get_device_descriptor fail in hub_port_init, we will call hub_port_disable.
Then usb3.0 device may not recover successfully with only hot reset like below
function
retval = hub_port_reset(hub, port1, udev, delay, false);
For covering this error handling, we add warm reset if getting device
descriptor fail on usb3.0 devices.
Signed-off-by: che-chun Kuo <vichy....@gmail.com>
---
drivers/usb/core/hub.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 090469e..0c3ca34 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -4316,6 +4316,9 @@ fail:
if (retval) {
hub_port_disable(hub, port1, 0);
update_devnum(udev, devnum); /* for disconnect processing */
+ if (udev->speed == USB_SPEED_SUPER)
+ hub_port_reset(hub, port1, udev,
+ HUB_BH_RESET_TIME, true);
}
mutex_unlock(&usb_address0_mutex);
return retval;
--
1.7.9.5
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