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;
From:   Sandeep Singh <Sandeep.Singh@amd.com>
To:     linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
        gregkh@linuxfoundation.org, mathias.nyman@intel.com
Cc:     Sandeep Singh <sandeep.singh@amd.com>,
        Nehal Shah <Nehal-bakulchandra.Shah@amd.com>,
        Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Subject: [PATCH] xhci: Add check for invalid byte size error when UAS devices are connected.
Date:   Fri, 21 Sep 2018 18:52:29 +0530
Message-Id: <1537536150-11721-1-git-send-email-Sandeep.Singh@amd.com>
MIME-Version: 1.0
Content-Type: text/plain
Received-SPF: None (protection.outlook.com: amd.com does not designate
 permitted sender hosts)
SpamDiagnosticOutput: 1:99
SpamDiagnosticMetadata: NSPM
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Sep 2018 13:23:09.0071 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 36b9de12-37f4-486c-b59a-08d61fc56108
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR12MB1661
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

From: Sandeep Singh <sandeep.singh@amd.com>

Observed "TRB completion code (27)" error which corresponds to Stopped -
Length Invalid error(xhci spec section 4.17.4) while connecting USB to
SATA bridge.

Looks like this case was not considered when the following patch[1] was
committed. Hence adding this new check which can prevent
the invalid byte size error.

[1] ade2e3a xhci: handle transfer events without TRB pointer

Signed-off-by: Sandeep Singh <sandeep.singh@amd.com>
cc: Nehal Shah <Nehal-bakulchandra.Shah@amd.com>
cc: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
---
 drivers/usb/host/xhci-ring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index f0a99aa..8ba2cbc 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2246,6 +2246,7 @@ static int handle_tx_event(struct xhci_hcd *xhci,
 			goto cleanup;
 		case COMP_RING_UNDERRUN:
 		case COMP_RING_OVERRUN:
+		case COMP_STOPPED_LENGTH_INVALID:
 			goto cleanup;
 		default:
 			xhci_err(xhci, "ERROR Transfer event for unknown stream ring slot %u ep %u\n",
-- 
2.7.4