usb: gadget: fix wrong endpoint desc

[ Upstream commit e5b5da96da50ef30abb39cb9f694e99366404d24 ]

Gadget driver should always use config_ep_by_speed() to initialize
usb_ep struct according to usb device's operating speed. Otherwise,
usb_ep struct may be wrong if usb devcie's operating speed is changed.

The key point in this patch is that we want to make sure the desc pointer
in usb_ep struct will be set to NULL when gadget is disconnected.
This will force it to call config_ep_by_speed() to correctly initialize
usb_ep struct based on the new operating speed when gadget is
re-connected later.

Reviewed-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: EJ Hsu <ejh@nvidia.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/usb/gadget/function/f_ecm.c b/drivers/usb/gadget/function/f_ecm.c
index 7ad60ee..4ce19b8 100644 (file)
--- a/drivers/usb/gadget/function/f_ecm.c
+++ b/drivers/usb/gadget/function/f_ecm.c
@@ -625,8 +625,12 @@ static void ecm_disable(struct usb_function *f)
 
        DBG(cdev, "ecm deactivated\n");
 
-       if (ecm->port.in_ep->enabled)
+       if (ecm->port.in_ep->enabled) {
                gether_disconnect(&ecm->port);
+       } else {
+               ecm->port.in_ep->desc = NULL;
+               ecm->port.out_ep->desc = NULL;
+       }
 
        usb_ep_disable(ecm->notify);
        ecm->notify->desc = NULL;

diff --git a/drivers/usb/gadget/function/f_rndis.c b/drivers/usb/gadget/function/f_rndis.c
index e587767..e281af9 100644 (file)
--- a/drivers/usb/gadget/function/f_rndis.c
+++ b/drivers/usb/gadget/function/f_rndis.c
@@ -619,6 +619,7 @@ static void rndis_disable(struct usb_function *f)
        gether_disconnect(&rndis->port);
 
        usb_ep_disable(rndis->notify);
+       rndis->notify->desc = NULL;
 }
 
 /*-------------------------------------------------------------------------*/