Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Subject: [PATCH 5.10 006/103] usb: dwc2: gadget: Fix ISOC transfer complete handling for DDMA
Date:   Mon, 27 Sep 2021 19:01:38 +0200
Message-Id: <20210927170225.927382341@linuxfoundation.org>
In-Reply-To: <20210927170225.702078779@linuxfoundation.org>
References: <20210927170225.702078779@linuxfoundation.org>
User-Agent: quilt/0.66
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>

commit dbe2518b2d8eabffa74dbf7d9fdd7dacddab7fc0 upstream.

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>
---
 drivers/usb/dwc2/gadget.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3066,9 +3066,7 @@ static void dwc2_hsotg_epint(struct dwc2
 
 		/* 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