From patchwork Tue Mar 22 14:07:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Weitao Wang X-Patchwork-Id: 12788395 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 83D4BC433F5 for ; Tue, 22 Mar 2022 14:08:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236322AbiCVOJq (ORCPT ); Tue, 22 Mar 2022 10:09:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236345AbiCVOJm (ORCPT ); Tue, 22 Mar 2022 10:09:42 -0400 Received: from ZXSHCAS1.zhaoxin.com (ZXSHCAS1.zhaoxin.com [203.148.12.81]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4278167C1; Tue, 22 Mar 2022 07:07:56 -0700 (PDT) Received: from zxbjmbx1.zhaoxin.com (10.29.252.163) by ZXSHCAS1.zhaoxin.com (10.28.252.161) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.27; Tue, 22 Mar 2022 22:07:23 +0800 Received: from L440.zhaoxin.com (10.29.8.49) by zxbjmbx1.zhaoxin.com (10.29.252.163) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Tue, 22 Mar 2022 22:07:23 +0800 From: WeitaoWangoc To: , , , , CC: , , , Weitao Wang Subject: [PATCH v2] USB: Fix xhci ERDP update issue Date: Tue, 22 Mar 2022 22:07:23 +0800 Message-ID: <20220322140723.9554-1-WeitaoWang-oc@zhaoxin.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 X-Originating-IP: [10.29.8.49] X-ClientProxiedBy: zxbjmbx1.zhaoxin.com (10.29.252.163) To zxbjmbx1.zhaoxin.com (10.29.252.163) Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On some situations, software handles TRB events slower than adding TRBs. If the number of TRB events to be processed in a given interrupt is 256. The local variable "event_ring_deq" that records in interrupt handler is equal to software_dequeue. It will cause driver not update ERDP,then software dequeue pointer is out of sync with ERDP on interrupt exit. On the next interrupt, the event ring may full but driver will not update ERDP as software_dequeue is equal to ERDP. [ 536.377115] xhci_hcd 0000:00:12.0: ERROR unknown event type 37 [ 566.933173] sd 8:0:0:0: [sdb] tag#27 uas_eh_abort_handler 0 uas-tag 7 inflight: CMD OUT [ 566.933181] sd 8:0:0:0: [sdb] tag#27 CDB: Write(10) 2a 00 17 71 e6 78 00 00 08 00 [ 572.041186] xhci_hcd On some situataions,the 0000:00:12.0: xHCI host not responding to stop endpoint command. [ 572.057193] xhci_hcd 0000:00:12.0: Host halt failed, -110 [ 572.057196] xhci_hcd 0000:00:12.0: xHCI host controller not responding, assume dead [ 572.057236] sd 8:0:0:0: [sdb] tag#26 uas_eh_abort_handler 0 uas-tag 6 inflight: CMD [ 572.057240] sd 8:0:0:0: [sdb] tag#26 CDB: Write(10) 2a 00 38 eb cc d8 00 00 08 00 [ 572.057244] sd 8:0:0:0: [sdb] tag#25 uas_eh_abort_handler 0 uas-tag 5 inflight: CMD Fixed this issue by update software record local variable when handles 128 TRB events. Fixes: dc0ffbea5729 ("usb: host: xhci: update event ring dequeue pointer on purpose") Signed-off-by: Weitao Wang --- v1->v2: - Add fixes information with improved commit messages. - Fix "tabs converted to spaces" issue. 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 d0b6806275e0..f9707997969d 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -3141,6 +3141,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd) if (event_loop++ < TRBS_PER_SEGMENT / 2) continue; xhci_update_erst_dequeue(xhci, event_ring_deq); + event_ring_deq = xhci->event_ring->dequeue; /* ring is half-full, force isoc trbs to interrupt more often */ if (xhci->isoc_bei_interval > AVOID_BEI_INTERVAL_MIN)