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usb: dwc3: gadget: Only End Transfer for ep0 data phase

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The driver shouldn't be able to issue End Transfer to the control
endpoint at anytime. Typically we should only do so in error cases such
as invalid/unexpected direction of Data Phase as described in the
control transfer flow of the programming guide. It _may_ end started
data phase during controller deinitialization from soft disconnect or
driver removal. However, that should not happen because the driver
should be maintained in EP0_SETUP_PHASE during driver tear-down. On
soft-connect, the controller should be reset from a soft-reset and there
should be no issue starting the control endpoint.

Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/3c6643678863a26702e4115e9e19d7d94a30d49c.1650593829.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thinh Nguyen 2022-04-21 19:22:57 -07:00 committed by Greg Kroah-Hartman
parent c96683798e
commit ace17b6ee4
1 changed files with 11 additions and 0 deletions
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11
drivers/usb/dwc3/gadget.c
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@ -3685,6 +3685,17 @@ static void dwc3_reset_gadget(struct dwc3 *dwc)
void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
bool interrupt)
{
struct dwc3 *dwc = dep->dwc;
/*
* Only issue End Transfer command to the control endpoint of a started
* Data Phase. Typically we should only do so in error cases such as
* invalid/unexpected direction as described in the control transfer
* flow of the programming guide.
*/
if (dep->number <= 1 && dwc->ep0state != EP0_DATA_PHASE)
return;
if (!(dep->flags & DWC3_EP_TRANSFER_STARTED) ||
(dep->flags & DWC3_EP_DELAY_STOP) ||
(dep->flags & DWC3_EP_END_TRANSFER_PENDING))