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usb: gadget: fix wrong endpoint desc 

[ Upstream commit e5b5da96da ]

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>
5.4-rM2-2.2.x-imx-squashed
EJ Hsu 2019-12-03 23:34:56 -08:00 committed by Greg Kroah-Hartman
parent 0f7cb06912
commit ae6e5f8d51
2 changed files with 6 additions and 1 deletions
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6
drivers/usb/gadget/function/f_ecm.c
View File

@ -621,8 +621,12 @@ 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;

1
drivers/usb/gadget/function/f_rndis.c
View File

@ -618,6 +618,7 @@ static void rndis_disable(struct usb_function *f)
gether_disconnect(&rndis->port);
usb_ep_disable(rndis->notify);
rndis->notify->desc = NULL;
}
/*-------------------------------------------------------------------------*/