Hope this is not too much in a single patch:
- since a while we are disabling an endpoint and purging every requests on
RESET and DISCONNECT which let to a warning since the endpoint was
disabled twice (once by the UDC, and second time by the gadget). I
think UDC should nuke all all requests because all those requests
become invalid and leave the enpoint disable to the responsibilit of
the gadget driver. This is done by merging dwc3_stop_active_transfer()
and dwc3_gadget_nuke_reqs() into dwc3_remove_requests().
- dwc3_stop_active_transfer() is now no longer called unconditionaly.
This has the advantage that it is always called to disable an active
transfer which means if res_trans_idx 0 than something went wrong and
it is an error condition because we can't clean up the requests.
- I remove the DWC3_EP_WILL_SHUTDOWN. I introduced it a while
introducing the command complete part for dequeue. All requests on
req_queued list should be removed during the dwc3_cleanup_done_reqs()
callback so there is no reason so go through the list again. I think
it is an error condition if requests are still on this list since we
never queue TRB without LST=1 (the last requests has always LST=1,
there are no requests with LST=0 behind it).
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
drivers/usb/dwc3/core.h | 1 -
drivers/usb/dwc3/gadget.c | 31 ++++++++++++-------------------
2 files changed, 12 insertions(+), 20 deletions(-)
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 83b2960..579f033 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -348,7 +348,6 @@ struct dwc3_ep {
#define DWC3_EP_WEDGE (1 << 2)
#define DWC3_EP_BUSY (1 << 4)
#define DWC3_EP_PENDING_REQUEST (1 << 5)
-#define DWC3_EP_WILL_SHUTDOWN (1 << 6)
unsigned current_trb;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index de5f0af..98d2f83 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -359,34 +359,36 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
return 0;
}
-static void dwc3_gadget_nuke_reqs(struct dwc3_ep *dep, const int status)
+static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum);
+static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
{
struct dwc3_request *req;
+ if (!list_empty(&dep->req_queued))
+ dwc3_stop_active_transfer(dwc, dep->number);
+
while (!list_empty(&dep->request_list)) {
req = next_request(&dep->request_list);
- dwc3_gadget_giveback(dep, req, status);
+ dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
}
- /* nuke queued TRBs as well on command complete */
- dep->flags |= DWC3_EP_WILL_SHUTDOWN;
}
/**
* __dwc3_gadget_ep_disable - Disables a HW endpoint
* @dep: the endpoint to disable
*
- * Caller should take care of locking
+ * This function also removes requests which are currently processed ny the
+ * hardware and those which are not yet scheduled.
+ * Caller should take care of locking.
*/
-static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum);
static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
{
struct dwc3 *dwc = dep->dwc;
u32 reg;
dep->flags &= ~DWC3_EP_ENABLED;
- dwc3_stop_active_transfer(dwc, dep->number);
- dwc3_gadget_nuke_reqs(dep, -ESHUTDOWN);
+ dwc3_remove_requests(dwc, dep);
reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
reg &= ~DWC3_DALEPENA_EP(dep->number);
@@ -1408,16 +1410,6 @@ static void dwc3_process_ep_cmd_complete(struct dwc3_ep *dep,
dwc3_cleanup_done_reqs(dwc, dep, &mod_ev, -ESHUTDOWN);
dep->flags &= ~DWC3_EP_BUSY;
/* pending requets are ignored and are queued on XferNotReady */
-
- if (dep->flags & DWC3_EP_WILL_SHUTDOWN) {
- while (!list_empty(&dep->req_queued)) {
- struct dwc3_request *req;
-
- req = next_request(&dep->req_queued);
- dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
- }
- dep->flags &= DWC3_EP_WILL_SHUTDOWN;
- }
}
static void dwc3_ep_cmd_compl(struct dwc3_ep *dep,
@@ -1525,6 +1517,7 @@ static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum)
dep = dwc->eps[epnum];
+ WARN_ON(!dep->res_trans_idx);
if (dep->res_trans_idx) {
cmd = DWC3_DEPCMD_ENDTRANSFER;
cmd |= DWC3_DEPCMD_HIPRI_FORCERM | DWC3_DEPCMD_CMDIOC;
@@ -1546,7 +1539,7 @@ static void dwc3_stop_active_transfers(struct dwc3 *dwc)
if (!(dep->flags & DWC3_EP_ENABLED))
continue;
- __dwc3_gadget_ep_disable(dep);
+ dwc3_remove_requests(dwc, dep);
}
}
--
1.7.5.4
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