diff mbox series

[v4,5/9] usb: dwc3: Avoid unmapping USB requests if endxfer is not complete

Message ID 20220817182359.13550-6-quic_wcheng@quicinc.com
State Superseded
Headers show
Series [v4,1/9] usb: dwc3: Do not service EP0 and conndone events if soft disconnected | expand

Commit Message

Wesley Cheng Aug. 17, 2022, 6:23 p.m. UTC
If DWC3_EP_DELAYED_STOP is set during stop active transfers, then do not
continue attempting to unmap request buffers during dwc3_remove_requests().
This can lead to SMMU faults, as the controller has not stopped the
processing of the TRB.  Defer this sequence to the EP0 out start, which
ensures that there are no pending SETUP transactions before issuing the
endxfer.

Reviewed-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
---
 drivers/usb/dwc3/core.h   | 3 +++
 drivers/usb/dwc3/ep0.c    | 5 ++++-
 drivers/usb/dwc3/gadget.c | 6 +++++-
 3 files changed, 12 insertions(+), 2 deletions(-)

Comments

Greg KH Aug. 30, 2022, 2:08 p.m. UTC | #1
On Wed, Aug 17, 2022 at 11:23:55AM -0700, Wesley Cheng wrote:
> If DWC3_EP_DELAYED_STOP is set during stop active transfers, then do not
> continue attempting to unmap request buffers during dwc3_remove_requests().
> This can lead to SMMU faults, as the controller has not stopped the
> processing of the TRB.  Defer this sequence to the EP0 out start, which
> ensures that there are no pending SETUP transactions before issuing the
> endxfer.
> 
> Reviewed-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
> Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
> ---
>  drivers/usb/dwc3/core.h   | 3 +++
>  drivers/usb/dwc3/ep0.c    | 5 ++++-
>  drivers/usb/dwc3/gadget.c | 6 +++++-
>  3 files changed, 12 insertions(+), 2 deletions(-)
> 

This commit does not apply to my usb-testing branch.  I've taken the
first 4, please rebase and resend the rest.

thanks,

greg k-h
Wesley Cheng Aug. 30, 2022, 6:13 p.m. UTC | #2
Hi Greg,

On 8/30/2022 7:08 AM, Greg KH wrote:
> On Wed, Aug 17, 2022 at 11:23:55AM -0700, Wesley Cheng wrote:
>> If DWC3_EP_DELAYED_STOP is set during stop active transfers, then do not
>> continue attempting to unmap request buffers during dwc3_remove_requests().
>> This can lead to SMMU faults, as the controller has not stopped the
>> processing of the TRB.  Defer this sequence to the EP0 out start, which
>> ensures that there are no pending SETUP transactions before issuing the
>> endxfer.
>>
>> Reviewed-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
>> Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
>> ---
>>   drivers/usb/dwc3/core.h   | 3 +++
>>   drivers/usb/dwc3/ep0.c    | 5 ++++-
>>   drivers/usb/dwc3/gadget.c | 6 +++++-
>>   3 files changed, 12 insertions(+), 2 deletions(-)
>>
> 
> This commit does not apply to my usb-testing branch.  I've taken the
> first 4, please rebase and resend the rest.
> 

Sure resubmit it later today.  Sorry about that and thanks for the heads up.

Thanks
Wesley Cheng
diff mbox series

Patch

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 4fe4287dc934..7327e5767df9 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1560,6 +1560,7 @@  int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd,
 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned int cmd,
 		u32 param);
 void dwc3_gadget_clear_tx_fifos(struct dwc3 *dwc);
+void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep);
 #else
 static inline int dwc3_gadget_init(struct dwc3 *dwc)
 { return 0; }
@@ -1581,6 +1582,8 @@  static inline int dwc3_send_gadget_generic_command(struct dwc3 *dwc,
 { return 0; }
 static inline void dwc3_gadget_clear_tx_fifos(struct dwc3 *dwc)
 { }
+static inline void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
+{ }
 #endif
 
 #if IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 33cee0089609..fbb154a5ee1f 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -293,7 +293,10 @@  void dwc3_ep0_out_start(struct dwc3 *dwc)
 			continue;
 
 		dwc3_ep->flags &= ~DWC3_EP_DELAY_STOP;
-		dwc3_stop_active_transfer(dwc3_ep, true, true);
+		if (dwc->connected)
+			dwc3_stop_active_transfer(dwc3_ep, true, true);
+		else
+			dwc3_remove_requests(dwc, dwc3_ep);
 	}
 }
 
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index aff288b7baeb..7b66a54250a0 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -965,12 +965,16 @@  static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action)
 	return 0;
 }
 
-static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
+void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
 {
 	struct dwc3_request		*req;
 
 	dwc3_stop_active_transfer(dep, true, false);
 
+	/* If endxfer is delayed, avoid unmapping requests */
+	if (dep->flags & DWC3_EP_DELAY_STOP)
+		return;
+
 	/* - giveback all requests to gadget driver */
 	while (!list_empty(&dep->started_list)) {
 		req = next_request(&dep->started_list);