usb: dwc2: gadget: Fix ISOC transfer complete handling for DDMA

When last descriptor in a descriptor list completed with XferComplete
interrupt, core switching to handle next descriptor and assert BNA
interrupt. Both these interrupts are set while dwc2_hsotg_epint()
handler called. Each interrupt should be handled separately: first
XferComplete interrupt then BNA interrupt, otherwise last completed
transfer will not be giveback to function driver as completed
request.

Fixes: 729cac693eec ("usb: dwc2: Change ISOC DDMA flow")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Link: https://lore.kernel.org/r/a36981accc26cd674c5d8f8da6164344b94ec1fe.1631386531.git.Minas.Harutyunyan@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index f09cbdf..11d85a6 100644 (file)
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3067,9 +3067,7 @@ static void dwc2_hsotg_epint(struct dwc2_hsotg *hsotg, unsigned int idx,
 
                /* In DDMA handle isochronous requests separately */
                if (using_desc_dma(hsotg) && hs_ep->isochronous) {
-                       /* XferCompl set along with BNA */
-                       if (!(ints & DXEPINT_BNAINTR))
-                               dwc2_gadget_complete_isoc_request_ddma(hs_ep);
+                       dwc2_gadget_complete_isoc_request_ddma(hs_ep);
                } else if (dir_in) {
                        /*
                         * We get OutDone from the FIFO, so we only