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SubjectRe: [PATCH] usb: dwc3: gadget: Fail request submission if it was already queued
Date

Hi,

Manu Gautam <mgautam@codeaurora.org> writes:
>> Manu Gautam <mgautam@codeaurora.org> writes:
>>> If a function driver tries to re-submit an already queued request,
>>> it can results in corruption of pending/started request lists.
>>> Catch such conditions and fail the request submission to DCD.
>>>
>>> Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
>>> ---
>>> drivers/usb/dwc3/gadget.c | 6 ++++++
>>> 1 file changed, 6 insertions(+)
>>>
>>> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
>>> index 679c12e14522..51716c6b286a 100644
>>> --- a/drivers/usb/dwc3/gadget.c
>>> +++ b/drivers/usb/dwc3/gadget.c
>>> @@ -1290,6 +1290,12 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
>>> &req->request, req->dep->name))
>>> return -EINVAL;
>>>
>>> + if (req->request.status == -EINPROGRESS) {
>> this test is really not enough. What if gadget driver set status to
>> EINPROGRESS before submission? A better check would involve making sure
>> req isn't part of dep->pending_list or dep->started_list or
>> dep->cancelled_list. It's clear that this won't work very well as the
>> amount of requests grow.
>
> Thanks for quick review.
> 'request.status' check can be replaced:
> +if (!list_empty(&req->list) {
>
> And replace list_del with list_del_init from dwc3_gadget_giveback()

I would rather avoid this. We could start tracking our own internal
dwc3_request status. Something along the lines of:

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index df876418cb78..5c3ee741541f 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -863,6 +863,7 @@ struct dwc3_hwparams {
* @num_pending_sgs: counter to pending sgs
* @num_queued_sgs: counter to the number of sgs which already got queued
* @remaining: amount of data remaining
+ * @status: internal dwc3 request status tracking
* @epnum: endpoint number to which this request refers
* @trb: pointer to struct dwc3_trb
* @trb_dma: DMA address of @trb
@@ -883,6 +884,14 @@ struct dwc3_request {
unsigned num_pending_sgs;
unsigned int num_queued_sgs;
unsigned remaining;
+
+ unsigned int status;
+#define DWC3_REQUEST_STATUS_QUEUED 0
+#define DWC3_REQUEST_STATUS_STARTED 1
+#define DWC3_REQUEST_STATUS_CANCELLED 2
+#define DWC3_REQUEST_STATUS_COMPLETED 3
+#define DWC3_REQUEST_STATUS_UNKNOWN -1
+
u8 epnum;
struct dwc3_trb *trb;
dma_addr_t trb_dma;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 07bd31bb2f8a..74db274786bc 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -208,6 +208,7 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
struct dwc3 *dwc = dep->dwc;

dwc3_gadget_del_and_unmap_request(dep, req, status);
+ req->status = DWC3_REQUEST_STATUS_COMPLETED;

spin_unlock(&dwc->lock);
usb_gadget_giveback_request(&dep->endpoint, &req->request);
@@ -846,6 +847,7 @@ static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
req->direction = dep->direction;
req->epnum = dep->number;
req->dep = dep;
+ req->status = DWC3_REQUEST_STATUS_UNKNOWN;

trace_dwc3_alloc_request(req);

@@ -1434,6 +1436,11 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
&req->request, req->dep->name))
return -EINVAL;

+ if (WARN(req->status < DWC3_REQUEST_STATUS_COMPLETED,
+ "%s: request %pK already in flight\n",
+ dep->name, &req->request))
+ return -EINVAL;
+
pm_runtime_get(dwc->dev);

req->request.actual = 0;
@@ -1442,6 +1449,7 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
trace_dwc3_ep_queue(req);

list_add_tail(&req->list, &dep->pending_list);
+ req->status = DWC3_REQUEST_STATUS_QUEUED;

/*
* NOTICE: Isochronous endpoints should NEVER be prestarted. We must
diff --git a/drivers/usb/dwc3/gadget.h b/drivers/usb/dwc3/gadget.h
index 023a473648eb..6aebe8c0eae1 100644
--- a/drivers/usb/dwc3/gadget.h
+++ b/drivers/usb/dwc3/gadget.h
@@ -76,6 +76,7 @@ static inline void dwc3_gadget_move_started_request(struct dwc3_request *req)
struct dwc3_ep *dep = req->dep;

req->started = true;
+ req->status = DWC3_REQUEST_STATUS_STARTED;
list_move_tail(&req->list, &dep->started_list);
}

@@ -91,6 +92,7 @@ static inline void dwc3_gadget_move_cancelled_request(struct dwc3_request *req)
struct dwc3_ep *dep = req->dep;

req->started = false;
+ req->status = DWC3_REQUEST_STATUS_CANCELLED;
list_move_tail(&req->list, &dep->cancelled_list);
}

With this, we can remove some of the other request flags, such as "started".
>> Anyway, which gadget driver did this? Why is it only affecting dwc3?
>
> Function driver is not in upstream (f_mtp.c).

So this could happen with any UDC, right? Why is f_mtp.c queueing the
same request twice?

--
balbi
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