Index: sys/dev/usb/ehci.c
===================================================================
RCS file: /cvsroot/src/sys/dev/usb/ehci.c,v
retrieving revision 1.273
diff -u -p -r1.273 ehci.c
--- sys/dev/usb/ehci.c	15 Feb 2020 01:21:56 -0000	1.273
+++ sys/dev/usb/ehci.c	20 Feb 2020 18:33:10 -0000
@@ -3748,7 +3748,7 @@ Static void
 ehci_device_ctrl_close(struct usbd_pipe *pipe)
 {
 	ehci_softc_t *sc = EHCI_PIPE2SC(pipe);
-	/*struct ehci_pipe *epipe = EHCI_PIPE2EPIPE(pipe);*/
+	struct ehci_pipe * const epipe = EHCI_PIPE2EPIPE(pipe);
 
 	EHCIHIST_FUNC(); EHCIHIST_CALLED();
 
@@ -3757,6 +3757,8 @@ ehci_device_ctrl_close(struct usbd_pipe 
 	DPRINTF("pipe=%#jx", (uintptr_t)pipe, 0, 0, 0);
 
 	ehci_close_pipe(pipe, sc->sc_async_head);
+
+	usb_freemem(&sc->sc_bus, &epipe->ctrl.reqdma);
 }
 
 /*
Index: sys/dev/usb/ohci.c
===================================================================
RCS file: /cvsroot/src/sys/dev/usb/ohci.c,v
retrieving revision 1.295
diff -u -p -r1.295 ohci.c
--- sys/dev/usb/ohci.c	15 Feb 2020 01:21:56 -0000	1.295
+++ sys/dev/usb/ohci.c	20 Feb 2020 18:33:11 -0000
@@ -2841,6 +2841,8 @@ ohci_device_ctrl_close(struct usbd_pipe 
 	DPRINTF("pipe=%#jx", (uintptr_t)pipe, 0, 0, 0);
 	ohci_close_pipe(pipe, sc->sc_ctrl_head);
 	ohci_free_std_locked(sc, opipe->tail.td);
+
+	usb_freemem(&sc->sc_bus, &opipe->ctrl.reqdma);
 }
 
 /************************/
Index: sys/dev/usb/uhci.c
===================================================================
RCS file: /cvsroot/src/sys/dev/usb/uhci.c,v
retrieving revision 1.293
diff -u -p -r1.293 uhci.c
--- sys/dev/usb/uhci.c	15 Feb 2020 01:21:56 -0000	1.293
+++ sys/dev/usb/uhci.c	20 Feb 2020 18:33:11 -0000
@@ -2807,6 +2807,7 @@ uhci_device_ctrl_close(struct usbd_pipe 
 	uhci_free_std_locked(sc, upipe->ctrl.setup);
 	uhci_free_std_locked(sc, upipe->ctrl.stat);
 
+	usb_freemem(&sc->sc_bus, &upipe->ctrl.reqdma);
 }
 
 /* Abort a device interrupt request. */
Index: sys/external/bsd/dwc2/dwc2.c
===================================================================
RCS file: /cvsroot/src/sys/external/bsd/dwc2/dwc2.c,v
retrieving revision 1.71
diff -u -p -r1.71 dwc2.c
--- sys/external/bsd/dwc2/dwc2.c	15 Feb 2020 14:05:06 -0000	1.71
+++ sys/external/bsd/dwc2/dwc2.c	20 Feb 2020 18:33:11 -0000
@@ -764,9 +764,13 @@ dwc2_device_ctrl_abort(struct usbd_xfer 
 Static void
 dwc2_device_ctrl_close(struct usbd_pipe *pipe)
 {
+	struct dwc2_softc * const sc = DWC2_PIPE2SC(pipe);
+	struct dwc2_pipe * const dpipe = DWC2_PIPE2DPIPE(pipe);
 
 	DPRINTF("pipe=%p\n", pipe);
 	dwc2_close_pipe(pipe);
+
+	usb_freemem(&sc->sc_bus, &dpipe->req_dma);
 }
 
 Static void
Index: sys/arch/mips/adm5120/dev/ahci.c
===================================================================
RCS file: /cvsroot/src/sys/arch/mips/adm5120/dev/ahci.c,v
retrieving revision 1.20
diff -u -p -r1.20 ahci.c
--- sys/arch/mips/adm5120/dev/ahci.c	15 Feb 2020 01:21:56 -0000	1.20
+++ sys/arch/mips/adm5120/dev/ahci.c	20 Feb 2020 18:33:11 -0000
@@ -989,6 +989,9 @@ ahci_device_ctrl_start(struct usbd_xfer 
 
 	usb_transfer_complete(xfer);
 	mutex_exit(&sc->sc_lock);
+
+	usb_freemem(&sc->sc_bus, &reqdma);
+
 	return USBD_NORMAL_COMPLETION;
 }