From: Krishna Kurapati quic_kriskura@quicinc.com
commit c0aabed9cabe057309779a9e26fe86a113d24dad upstream.
In scenarios where pullup relies on resume (get sync) to initialize the controller and set the run stop bit, then core_init is followed by gadget_resume which will eventually set run stop bit.
But in cases where the core_init fails, the return value is not sent back to udc appropriately. So according to UDC the controller has started but in reality we never set the run stop bit.
On systems like Android, there are uevents sent to HAL depending on whether the configfs_bind / configfs_disconnect were invoked. In the above mentioned scnenario, if the core init fails, the run stop won't be set and the cable plug-out won't result in generation of any disconnect event and userspace would never get any uevent regarding cable plug out and we never call pullup(0) again. Furthermore none of the next Plug-In/Plug-Out's would be known to configfs.
Return back the appropriate result to UDC to let the userspace/ configfs know that the pullup failed so they can take appropriate action.
Fixes: 77adb8bdf422 ("usb: dwc3: gadget: Allow runtime suspend if UDC unbinded") Cc: stable stable@kernel.org Signed-off-by: Krishna Kurapati quic_kriskura@quicinc.com Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Message-ID: 20230618120949.14868-1-quic_kriskura@quicinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/gadget.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2631,7 +2631,9 @@ static int dwc3_gadget_pullup(struct usb ret = pm_runtime_get_sync(dwc->dev); if (!ret || ret < 0) { pm_runtime_put(dwc->dev); - return 0; + if (ret < 0) + pm_runtime_set_suspended(dwc->dev); + return ret; }
if (dwc->pullups_connected == is_on) {