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usb: core: Fix hub port connection events lost
This will clear the USB_PORT_FEAT_C_CONNECTION bit in case of a hub port reset only if a device is was attached to the hub port before resetting the hub port. Using a Lenovo T480s attached to the ultra dock it was not possible to detect some usb-c devices at the dock usb-c ports because the hub_port_reset code will clear the USB_PORT_FEAT_C_CONNECTION bit after the actual hub port reset. Using this device combo the USB_PORT_FEAT_C_CONNECTION bit was set between the actual hub port reset and the clear of the USB_PORT_FEAT_C_CONNECTION bit. This ends up with clearing the USB_PORT_FEAT_C_CONNECTION bit after the new device was attached such that it was not detected. This patch will not clear the USB_PORT_FEAT_C_CONNECTION bit if there is currently no device attached to the port before the hub port reset. This will avoid clearing the connection bit for new attached devices. Signed-off-by: Dennis Wassenberg <dennis.wassenberg@secunet.com> Acked-by: Mathias Nyman <mathias.nyman@linux.intel.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -2850,6 +2850,8 @@ static int hub_port_reset(struct usb_hub *hub, int port1,
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USB_PORT_FEAT_C_BH_PORT_RESET);
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usb_clear_port_feature(hub->hdev, port1,
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USB_PORT_FEAT_C_PORT_LINK_STATE);
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if (udev)
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usb_clear_port_feature(hub->hdev, port1,
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USB_PORT_FEAT_C_CONNECTION);
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