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Wed, 13 Dec 2023 06:18:54 +0000 Received: from TYZPR01MB4784.apcprd01.prod.exchangelabs.com ([fe80::5074:605e:7b60:3ad4]) by TYZPR01MB4784.apcprd01.prod.exchangelabs.com ([fe80::5074:605e:7b60:3ad4%5]) with mapi id 15.20.7068.033; Wed, 13 Dec 2023 06:18:54 +0000 From: Yaxiong Tian To: mathias.nyman@intel.com, gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Yaxiong Tian , Mathias Nyman , Hongyu Xie Subject: [V2] usb:xhci: Avoid hub_event() stuck when xHC restore state timeout Date: Wed, 13 Dec 2023 14:18:38 +0800 Message-ID: X-Mailer: git-send-email 2.25.1 X-TMN: [2saL7vsID0RKA58RfLsim7JW/8dwXKMPRizmaVDArww=] X-ClientProxiedBy: TYAPR01CA0209.jpnprd01.prod.outlook.com (2603:1096:404:29::29) To TYZPR01MB4784.apcprd01.prod.exchangelabs.com (2603:1096:400:28d::9) X-Microsoft-Original-Message-ID: <20231213061838.349708-1-iambestgod@outlook.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: TYZPR01MB4784:EE_|OSQPR01MB6328:EE_ X-MS-Office365-Filtering-Correlation-Id: a4190e36-1618-47fa-fa6e-08dbfba360d9 X-Microsoft-Antispam: BCL:0; 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After usb_hc_died() called ,they kick hub_wq to running hub_event() but the wq is freezd. When suspend ends,hub_evnet realy running and sticking. Such as: [ 968.794016][ 2] [ T37] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 968.802969][ 2] [ T37] kworker/2:3 D 0 999 2 0x00000028 [ 968.809579][ 2] [ T37] Workqueue: usb_hub_wq hub_event [ 968.814885][ 2] [ T37] Call trace: [ 968.818455][ 2] [ T37] __switch_to+0xd4/0x138 [ 968.823067][ 2] [ T37] __schedule+0x2dc/0x6a0 [ 968.827680][ 2] [ T37] schedule+0x34/0xb0 [ 968.831947][ 2] [ T37] schedule_timeout+0x1e0/0x298 [ 968.837079][ 2] [ T37] __wait_for_common+0xf0/0x208 [ 968.842212][ 2] [ T37] wait_for_completion+0x1c/0x28 [ 968.847432][ 2] [ T37] xhci_configure_endpoint+0x104/0x640 [ 968.853173][ 2] [ T37] xhci_check_bandwidth+0x140/0x2e0 [ 968.858652][ 2] [ T37] usb_hcd_alloc_bandwidth+0x1c8/0x348 [ 968.864393][ 2] [ T37] usb_disable_device+0x198/0x260 [ 968.869698][ 2] [ T37] usb_disconnect+0xdc/0x3a0 [ 968.874571][ 2] [ T37] usb_disconnect+0xbc/0x3a0 [ 968.879441][ 2] [ T37] hub_quiesce+0xa0/0x108 [ 968.884053][ 2] [ T37] hub_event+0x4d4/0x1558 [ 968.888664][ 2] [ T37] kretprobe_trampoline+0x0/0xc4 [ 968.893884][ 2] [ T37] worker_thread+0x4c/0x488 [ 968.898668][ 2] [ T37] kthread+0xf8/0x128 [ 968.902933][ 2] [ T37] ret_from_fork+0x10/0x18 The result is that you cannot suspend again.because the wq can't be freezed.Also hard to reboot,when some application visited this piece. The reason of stuck is that the xhci_resume() don't complete correctly. In the error path before command |= CMD_RUN,the xhc should not be accessed. To fix it, move set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) and others after "done:" .Also add HCD_HW_ACCESSIBLE() checks in queue_command(). Suggested-by: Mathias Nyman Signed-off-by: Yaxiong Tian Signed-off-by: Hongyu Xie --- drivers/usb/host/xhci-ring.c | 7 +++++-- drivers/usb/host/xhci.c | 10 +++++----- 2 files changed, 10 insertions(+), 7 deletions(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 2c1d614b3b0f..ee6e06590974 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -4263,10 +4263,13 @@ static int queue_command(struct xhci_hcd *xhci, struct xhci_command *cmd, { int reserved_trbs = xhci->cmd_ring_reserved_trbs; int ret; + struct usb_hcd *hcd = xhci_to_hcd(xhci); if ((xhci->xhc_state & XHCI_STATE_DYING) || - (xhci->xhc_state & XHCI_STATE_HALTED)) { - xhci_dbg(xhci, "xHCI dying or halted, can't queue_command\n"); + (xhci->xhc_state & XHCI_STATE_HALTED) || + !HCD_HW_ACCESSIBLE(hcd)) { + xhci_dbg(xhci, + "xHCI dying or halted,or hcd hw can't accessible,can't queue_command\n"); return -ESHUTDOWN; } diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 08fbabff23a0..7f2c2b76a51c 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1006,10 +1006,6 @@ int xhci_resume(struct xhci_hcd *xhci, pm_message_t msg) time_before(jiffies, xhci->usb3_rhub.bus_state.next_statechange)) msleep(100); - set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); - if (xhci->shared_hcd) - set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags); - spin_lock_irq(&xhci->lock); if (hibernated || xhci->quirks & XHCI_RESET_ON_RESUME || xhci->broken_suspend) @@ -1133,9 +1129,13 @@ int xhci_resume(struct xhci_hcd *xhci, pm_message_t msg) spin_unlock_irq(&xhci->lock); + done: + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + if (xhci->shared_hcd) + set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags); + xhci_dbc_resume(xhci); - done: if (retval == 0) { /* * Resume roothubs only if there are pending events.