Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Received-SPF: Pass (protection.outlook.com: domain of xilinx.com designates
 149.199.60.83 as permitted sender) receiver=protection.outlook.com;
 client-ip=149.199.60.83; helo=xsj-pvapsmtpgw01;
From:   Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>
To:     Felipe Balbi <balbi@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Shuah Khan <shuah@kernel.org>,
        Alan Stern <stern@rowland.harvard.edu>,
        Johan Hovold <johan@kernel.org>,
        Jaejoong Kim <climbbb.kim@gmail.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Roger Quadros <rogerq@ti.com>,
        Manu Gautam <mgautam@codeaurora.org>,
        <martin.petersen@oracle.com>, Bart Van Assche <bvanassche@acm.org>,
        Mike Christie <mchristi@redhat.com>,
        Matthew Wilcox <willy@infradead.org>,
        Colin Ian King <colin.king@canonical.com>
CC:     <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <v.anuragkumar@gmail.com>, Thinh Nguyen <thinhn@synopsys.com>,
        Tejas Joglekar <tejas.joglekar@synopsys.com>,
        Ajay Yugalkishore Pandey <APANDEY@xilinx.com>,
        Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>
Subject: [PATCH v7 09/10] usb: dwc3: Check for IOC/LST bit in both event->status and TRB->ctrl fields
Date:   Sat, 1 Dec 2018 16:43:30 +0530
Message-ID: <1543662811-5194-10-git-send-email-anurag.kumar.vulisha@xilinx.com>
In-Reply-To: <1543662811-5194-1-git-send-email-anurag.kumar.vulisha@xilinx.com>
References: <1543662811-5194-1-git-send-email-anurag.kumar.vulisha@xilinx.com>
MIME-Version: 1.0
Content-Type: text/plain
SpamDiagnosticOutput: 1:99
SpamDiagnosticMetadata: NSPM
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Dec 2018 11:13:45.0833
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 858c1e0f-079b-4145-59f0-08d6577e0f47
X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.60.83];Helo=[xsj-pvapsmtpgw01]
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR0201MB3508
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

The present code in dwc3_gadget_ep_reclaim_completed_trb() will check
for IOC/LST bit in the event->status and returns if IOC/LST bit is
set. This logic doesn't work if multiple TRBs are queued per
request and the IOC/LST bit is set on the last TRB of that request.
Consider an example where a queued request has multiple queued TRBs
and IOC/LST bit is set only for the last TRB. In this case, the Core
generates XferComplete/XferInProgress events only for the last TRB
(since IOC/LST are set only for the last TRB). As per the logic in
dwc3_gadget_ep_reclaim_completed_trb() event->status is checked for
IOC/LST bit and returns on the first TRB. This makes the remaining
TRBs left unhandled.
To aviod this, changed the code to check for IOC/LST bits in both
event->status & TRB->ctrl. This patch does the same.

Signed-off-by: Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>
Reviewed-by: Thinh Nguyen <thinhn@synopsys.com>
Tested-by: Tejas Joglekar <tejas.joglekar@synopsys.com>
---
 Changes in v7:
	1. None

 Changes in v6:
	1. None

 Changes in v5:
	1. None

 Changes in v4:
	1. None

 Changes in v3:
	1. None

 Changes in v2:
	1. None
---
 drivers/usb/dwc3/gadget.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 9ddc9fd..216179e 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2286,7 +2286,12 @@ static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
 	if (event->status & DEPEVT_STATUS_SHORT && !chain)
 		return 1;
 
-	if (event->status & (DEPEVT_STATUS_IOC | DEPEVT_STATUS_LST))
+	if ((event->status & DEPEVT_STATUS_IOC) &&
+	    (trb->ctrl & DWC3_TRB_CTRL_IOC))
+		return 1;
+
+	if ((event->status & DEPEVT_STATUS_LST) &&
+	    (trb->ctrl & DWC3_TRB_CTRL_LST))
 		return 1;
 
 	return 0;
-- 
2.1.1