From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nathan Fontenot Subject: [PATCH net-next 08/10] ibmvnic: Disable irq prior to close Date: Wed, 19 Apr 2017 13:45:10 -0400 Message-ID: <20170419174510.37372.10291.stgit@ltcalpine2-lp23.aus.stglabs.ibm.com> References: <20170419174015.37372.48544.stgit@ltcalpine2-lp23.aus.stglabs.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: brking@linux.vnet.ibm.com, jallen@linux.vnet.ibm.com, muvic@linux.vnet.ibm.com, tlfalcon@linux.vnet.ibm.com To: netdev@vger.kernel.org Return-path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:51111 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934636AbdDSN4P (ORCPT ); Wed, 19 Apr 2017 09:56:15 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v3JDrfPp142354 for ; Wed, 19 Apr 2017 09:56:15 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0a-001b2d01.pphosted.com with ESMTP id 29x74mppq5-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 19 Apr 2017 09:56:13 -0400 Received: from localhost by e13.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 19 Apr 2017 09:56:12 -0400 In-Reply-To: <20170419174015.37372.48544.stgit@ltcalpine2-lp23.aus.stglabs.ibm.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Brian King Add some code to call disable_irq on all the vnic interface's irqs. This fixes a crash observed when closing an active interface, as seen in the oops below when we try to access a buffer in the interrupt handler which we've already freed. Unable to handle kernel paging request for data at address 0x00000001 Faulting instruction address: 0xd000000003886824 Oops: Kernel access of bad area, sig: 11 [#1] SMP NR_CPUS=2048 NUMA pSeries Modules linked in: ibmvnic(OEN) rpadlpar_io(X) rpaphp(X) tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag rpcsec_ Supported: No, Unsupported modules are loaded CPU: 8 PID: 0 Comm: swapper/8 Tainted: G OE NX 4.4.49-92.11-default #1 task: c00000007f990110 ti: c0000000fffa0000 task.ti: c00000007f9b8000 NIP: d000000003886824 LR: d000000003886824 CTR: c0000000007eff60 REGS: c0000000fffa3a70 TRAP: 0300 Tainted: G OE NX (4.4.49-92.11-default) MSR: 8000000000009033 CR: 22008042 XER: 20000008 CFAR: c000000000008468 DAR: 0000000000000001 DSISR: 40000000 SOFTE: 0 GPR00: d000000003886824 c0000000fffa3cf0 d000000003894118 0000000000000000 GPR04: 0000000000000000 0000000000000000 c000000001249da0 0000000000000000 GPR08: 000000000000000e 0000000000000000 c0000000ccb00000 d000000003889180 GPR12: c0000000007eff60 c000000007af4c00 0000000000000001 c0000000010def30 GPR16: c00000007f9b8000 c000000000b98c30 c00000007f9b8080 c000000000bab858 GPR20: 0000000000000005 0000000000000000 c0000000ff5d7e80 c0000000f809f648 GPR24: c0000000ff5d7ec8 0000000000000000 0000000000000000 c0000000ccb001a0 GPR28: 000000000000000a c0000000f809f600 c0000000fd4cd900 c0000000f9cd5b00 NIP [d000000003886824] ibmvnic_interrupt_tx+0x114/0x380 [ibmvnic] LR [d000000003886824] ibmvnic_interrupt_tx+0x114/0x380 [ibmvnic] Call Trace: [c0000000fffa3cf0] [d000000003886824] ibmvnic_interrupt_tx+0x114/0x380 [ibmvnic] (unreliable) [c0000000fffa3dd0] [c000000000132940] __handle_irq_event_percpu+0x90/0x2e0 [c0000000fffa3e90] [c000000000132bcc] handle_irq_event_percpu+0x3c/0x90 [c0000000fffa3ed0] [c000000000132c88] handle_irq_event+0x68/0xc0 [c0000000fffa3f00] [c000000000137edc] handle_fasteoi_irq+0xec/0x250 [c0000000fffa3f30] [c000000000131b04] generic_handle_irq+0x54/0x80 [c0000000fffa3f60] [c000000000011190] __do_irq+0x80/0x1d0 [c0000000fffa3f90] [c0000000000248d8] call_do_irq+0x14/0x24 [c00000007f9bb9e0] [c000000000011380] do_IRQ+0xa0/0x120 [c00000007f9bba40] [c000000000002594] hardware_interrupt_common+0x114/0x180 Signed-off-by: Brian King Signed-off-by: Nathan Fontenot --- drivers/net/ethernet/ibm/ibmvnic.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index a8b3c57..ce8b147 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -689,6 +689,23 @@ static int ibmvnic_open(struct net_device *netdev) return -ENOMEM; } +static void disable_sub_crqs(struct ibmvnic_adapter *adapter) +{ + int i; + + if (adapter->tx_scrq) { + for (i = 0; i < adapter->req_tx_queues; i++) + if (adapter->tx_scrq[i]) + disable_irq(adapter->tx_scrq[i]->irq); + } + + if (adapter->rx_scrq) { + for (i = 0; i < adapter->req_rx_queues; i++) + if (adapter->rx_scrq[i]) + disable_irq(adapter->rx_scrq[i]->irq); + } +} + static int ibmvnic_close(struct net_device *netdev) { struct ibmvnic_adapter *adapter = netdev_priv(netdev); @@ -696,6 +713,7 @@ static int ibmvnic_close(struct net_device *netdev) int i; adapter->closing = true; + disable_sub_crqs(adapter); for (i = 0; i < adapter->req_rx_queues; i++) napi_disable(&adapter->napi[i]);