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usb: dwc3: ep0: Don't prepare beyond Setup stage

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Since we can't guarantee that the host won't send new Setup packet
before going through the device-initiated disconnect, don't prepare
beyond the Setup stage and keep the device in EP0_SETUP_PHASE. This
ensures that the device-initated disconnect sequence can go through
gracefully. Note that the controller won't service the End Transfer
command if it can't DMA out the Setup packet.

Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/6bacec56ecabb2c6e49a09cedfcac281fdc97de0.1650593829.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thinh Nguyen 2022-04-21 19:22:50 -07:00 committed by Greg Kroah-Hartman
parent 8f8034f493
commit c96683798e
2 changed files with 18 additions and 13 deletions
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2
drivers/usb/dwc3/ep0.c
View file

@ -813,7 +813,7 @@ static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
int ret = -EINVAL;
u32 len;
if (!dwc->gadget_driver)
if (!dwc->gadget_driver || !dwc->connected)
goto out;
trace_dwc3_ctrl_req(ctrl);

29
drivers/usb/dwc3/gadget.c
View file

@ -2514,6 +2514,23 @@ static int dwc3_gadget_soft_disconnect(struct dwc3 *dwc)
spin_lock_irqsave(&dwc->lock, flags);
dwc->connected = false;
/*
* Per databook, when we want to stop the gadget, if a control transfer
* is still in process, complete it and get the core into setup phase.
*/
if (dwc->ep0state != EP0_SETUP_PHASE) {
int ret;
reinit_completion(&dwc->ep0_in_setup);
spin_unlock_irqrestore(&dwc->lock, flags);
ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT));
spin_lock_irqsave(&dwc->lock, flags);
if (ret == 0)
dev_warn(dwc->dev, "timed out waiting for SETUP phase\n");
}
/*
* In the Synopsys DesignWare Cores USB3 Databook Rev. 3.30a
* Section 4.1.8 Table 4-7, it states that for a device-initiated
@ -2546,18 +2563,6 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
return 0;
dwc->softconnect = is_on;
/*
* Per databook, when we want to stop the gadget, if a control transfer
* is still in process, complete it and get the core into setup phase.
*/
if (!is_on && dwc->ep0state != EP0_SETUP_PHASE) {
reinit_completion(&dwc->ep0_in_setup);
ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT));
if (ret == 0)
dev_warn(dwc->dev, "timed out waiting for SETUP phase\n");
}
/*
* Avoid issuing a runtime resume if the device is already in the