EHCI HCDs will now support cancellation of syncrhonous transfers

arch/arm/src/efm32/efm32_usbhost.c

@@ -4678,7 +4678,8 @@ static int efm32_asynch(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep,
  * Name: efm32_cancel
  *
  * Description:
- *   Cancel a pending asynchronous transfer on an endpoint.
+ *   Cancel a pending asynchronous transfer on an endpoint.  Cancelled synchronous
+ *   or asynchronous transfer will complete normally with the error -ESHUTDOWN.
  *
  * Input Parameters:
  *   drvr - The USB host driver instance obtained as a parameter from the call to

arch/arm/src/lpc17xx/lpc17_usbhost.c

@@ -3224,7 +3224,8 @@ errout_with_sem:
  * Name: lpc17_cancel
  *
  * Description:
- *   Cancel a pending asynchronous transfer on an endpoint.
+ *   Cancel a pending asynchronous transfer on an endpoint.  Cancelled synchronous
+ *   or asynchronous transfer will complete normally with the error -ESHUTDOWN.
  *
  * Input Parameters:
  *   drvr - The USB host driver instance obtained as a parameter from the call to

arch/arm/src/lpc31xx/lpc31_ehci.c

@@ -3822,7 +3822,7 @@ static int lpc31_enumerate(FAR struct usbhost_connection_s *conn,
       usbhost_trace2(EHCI_TRACE2_CLASSENUM_FAILED, hport->port + 1, -ret);
 
       /* If this is a root hub port, then marking the hub port not connected will
-       * cause sam_wait() to return and we will try the connection again.
+       * cause lpc31_wait() to return and we will try the connection again.
        */
 
       hport->connected = false;
@@ -4475,7 +4475,8 @@ errout_with_sem:
  * Name: lpc31_cancel
  *
  * Description:
- *   Cancel a pending asynchronous transfer on an endpoint.
+ *   Cancel a pending asynchronous transfer on an endpoint.  Cancelled synchronous
+ *   or asynchronous transfer will complete normally with the error -ESHUTDOWN.
  *
  * Input Parameters:
  *   drvr - The USB host driver instance obtained as a parameter from the call to
@@ -4494,8 +4495,11 @@ static int lpc31_cancel(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep)
 {
   struct lpc31_epinfo_s *epinfo = (struct lpc31_epinfo_s *)ep;
   struct lpc31_qh_s *qh;
+  usbhost_asynch_t callback;
+  void *arg;
   uint32_t *bp;
   irqstate_t flags;
+  bool iocwait;
   int ret;
 
   DEBUGASSERT(epinfo);
@@ -4507,15 +4511,21 @@ static int lpc31_cancel(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep)
 
   lpc31_takesem(&g_ehci.exclsem);
 
-  /* If there is no asynchronous transfer in progress, then bail now */
+  /* Sample and reset all transfer termination information.  This will prevent any
+   * callbacks from occurring while are performing the cancellation.  The transfer
+   * may still be in progress, however, so this does not eliminate other DMA-
+   * related race conditions.
+   */
 
   flags = irqsave();
-  if (epinfo->callback == NULL)
+  callback         = epinfo->callback;
-    {
+  arg              = epinfo->arg;
-      ret = -EINVAL;
+  iocwait          = epinfo->iocwait;
-      irqrestore(flags);
+
-      goto errout_with_sem;
+  epinfo->callback = NULL;
-    }
+  epinfo->arg      = NULL;
+  epinfo->iocwait  = false;
+  irqrestore(flags);
 
   /* This will prevent any callbacks from occurring while are performing
    * the cancellation.  The transfer may still be in progress, however, so
@@ -4549,7 +4559,8 @@ static int lpc31_cancel(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep)
             {
               /* Claim that we successfully cancelled the transfer */
 
-              return OK;
+              ret = OK;
+              goto exit_terminate;
             }
         }
         break;
@@ -4569,7 +4580,8 @@ static int lpc31_cancel(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep)
                * cancelled the transfer.
                */
 
-              return OK;
+              ret = OK;
+              goto exit_terminate;
             }
         }
         break;
@@ -4602,6 +4614,27 @@ static int lpc31_cancel(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep)
       usbhost_trace1(EHCI_TRACE1_QTDFOREACH_FAILED, -ret);
     }
 
+  /* Was there a pending synchronous transfer? */
+
+exit_terminate:
+  epinfo->result = -ESHUTDOWN;
+  if (iocwait)
+    {
+      /* Yes... wake it up */
+
+      DEBUGASSERT(callback == NULL);
+      lpc31_givesem(&epinfo->iocsem);
+    }
+
+  /* No.. Is there a pending asynchronous transfer? */
+
+  else if (callback != NULL)
+    {
+      /* Yes.. perform the callback */
+
+      callback(arg, -ESHUTDOWN);
+    }
+
 errout_with_sem:
   lpc31_givesem(&g_ehci.exclsem);
   return ret;

arch/arm/src/sama5/sam_ehci.c

@@ -4302,7 +4302,8 @@ errout_with_sem:
  * Name: sam_cancel
  *
  * Description:
- *   Cancel a pending asynchronous transfer on an endpoint.
+ *   Cancel a pending asynchronous transfer on an endpoint.  Cancelled synchronous
+ *   or asynchronous transfer will complete normally with the error -ESHUTDOWN.
  *
  * Input Parameters:
  *   drvr - The USB host driver instance obtained as a parameter from the call to
@@ -4321,8 +4322,11 @@ static int sam_cancel(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep)
 {
   struct sam_epinfo_s *epinfo = (struct sam_epinfo_s *)ep;
   struct sam_qh_s *qh;
+  usbhost_asynch_t callback;
+  void *arg;
   uint32_t *bp;
   irqstate_t flags;
+  bool iocwait;
   int ret;
 
   DEBUGASSERT(epinfo);
@@ -4334,23 +4338,20 @@ static int sam_cancel(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep)
 
   sam_takesem(&g_ehci.exclsem);
 
-  /* If there is no asynchronous transfer in progress, then bail now */
+  /* Sample and reset all transfer termination information.  This will prevent any
+   * callbacks from occurring while are performing the cancellation.  The transfer
+   * may still be in progress, however, so this does not eliminate other DMA-
+   * related race conditions.
+   */
 
   flags = irqsave();
-  if (epinfo->callback == NULL)
+  callback         = epinfo->callback;
-    {
+  arg              = epinfo->arg;
-      ret = -EINVAL;
+  iocwait          = epinfo->iocwait;
-      irqrestore(flags);
-      goto errout_with_sem;
-    }
-
-  /* This will prevent any callbacks from occurring while are performing
-   * the cancellation.  The transfer may still be in progress, however, so
-   * this does not eliminate other DMA-related race conditions.
-   */
 
   epinfo->callback = NULL;
   epinfo->arg      = NULL;
+  epinfo->iocwait  = false;
   irqrestore(flags);
 
   /* Handle the cancellation according to the type of the transfer */
@@ -4376,7 +4377,8 @@ static int sam_cancel(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep)
             {
               /* Claim that we successfully cancelled the transfer */
 
-              return OK;
+              ret = OK;
+              goto exit_terminate;
             }
         }
         break;
@@ -4396,7 +4398,8 @@ static int sam_cancel(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep)
                * cancelled the transfer.
                */
 
-              return OK;
+              ret = OK;
+              goto exit_terminate;
             }
         }
         break;
@@ -4429,6 +4432,27 @@ static int sam_cancel(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep)
       usbhost_trace1(EHCI_TRACE1_QTDFOREACH_FAILED, -ret);
     }
 
+  /* Was there a pending synchronous transfer? */
+
+exit_terminate:
+  epinfo->result = -ESHUTDOWN;
+  if (iocwait)
+    {
+      /* Yes... wake it up */
+
+      DEBUGASSERT(callback == NULL);
+      sam_givesem(&epinfo->iocsem);
+    }
+
+  /* No.. Is there a pending asynchronous transfer? */
+
+  else if (callback != NULL)
+    {
+      /* Yes.. perform the callback */
+
+      callback(arg, -ESHUTDOWN);
+    }
+
 errout_with_sem:
   sam_givesem(&g_ehci.exclsem);
   return ret;

arch/arm/src/sama5/sam_ohci.c

@@ -3605,7 +3605,8 @@ errout:
  * Name: sam_cancel
  *
  * Description:
- *   Cancel a pending asynchronous transfer on an endpoint.
+ *   Cancel a pending asynchronous transfer on an endpoint.  Cancelled synchronous
+ *   or asynchronous transfer will complete normally with the error -ESHUTDOWN.
  *
  * Input Parameters:
  *   drvr - The USB host driver instance obtained as a parameter from the call to

arch/arm/src/stm32/stm32_otgfshost.c

@@ -4610,7 +4610,8 @@ static int stm32_asynch(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep,
  * Name: stm32_cancel
  *
  * Description:
- *   Cancel a pending asynchronous transfer on an endpoint.
+ *   Cancel a pending asynchronous transfer on an endpoint.  Cancelled synchronous
+ *   or asynchronous transfer will complete normally with the error -ESHUTDOWN.
  *
  * Input Parameters:
  *   drvr - The USB host driver instance obtained as a parameter from the call to

arch/arm/src/stm32/stm32_otghshost.c

@@ -4610,7 +4610,8 @@ static int stm32_asynch(FAR struct usbhost_driver_s *drvr, usbhost_ep_t ep,
  * Name: stm32_cancel
  *
  * Description:
- *   Cancel a pending asynchronous transfer on an endpoint.
+ *   Cancel a pending asynchronous transfer on an endpoint.  Cancelled synchronous
+ *   or asynchronous transfer will complete normally with the error -ESHUTDOWN.
  *
  * Input Parameters:
  *   drvr - The USB host driver instance obtained as a parameter from the call to