Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756526Ab2EGNFI (ORCPT ); Mon, 7 May 2012 09:05:08 -0400 Received: from mga02.intel.com ([134.134.136.20]:2520 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752056Ab2EGNFH (ORCPT ); Mon, 7 May 2012 09:05:07 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.67,351,1309762800"; d="scan'208";a="140949620" From: Chen Gong To: mchehab@redhat.com Cc: bp@amd64.org, tony.luck@intel.com, linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Chen Gong Subject: [PATCH V3] edac: avoid mce decoding crash after edac driver unloaded Date: Mon, 7 May 2012 21:05:50 +0800 Message-Id: <1336395950-12430-1-git-send-email-gong.chen@linux.intel.com> X-Mailer: git-send-email 1.7.10 In-Reply-To: <1336374233-11482-1-git-send-email-gong.chen@linux.intel.com> References: <1336374233-11482-1-git-send-email-gong.chen@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5586 Lines: 163 Some edac drivers register themselves as mce decoders via notifier_chain. But in current notifier_chain implementation logic, it doesn't accept same notifier registered twice. If so, it will be wrong when adding/removing the element from the list. For example, on one SandyBridge platform, remove module sb_edac and then trigger one error, it will hit oops because it has no mce decoder registered but related notifier_chain still points to an invalid callback function. Here is an example: Call Trace: [] atomic_notifier_call_chain+0x1a/0x20 [] mce_log+0x46/0x180 [] apei_mce_report_mem_error+0x4a/0x60 [] ghes_do_proc+0x192/0x210 [] ghes_proc+0x46/0x70 [] ghes_notify_sci+0x48/0x80 [] notifier_call_chain+0x55/0x80 [] __blocking_notifier_call_chain+0x5a/0x80 [] ? acpi_os_wait_events_complete+0x23/0x23 [] blocking_notifier_call_chain+0x16/0x20 [] acpi_hed_notify+0x19/0x1b [] acpi_device_notify+0x19/0x1b [] acpi_ev_notify_dispatch+0x67/0x7f [] acpi_os_execute_deferred+0x29/0x36 [] process_one_work+0x132/0x450 [] worker_thread+0x17b/0x3c0 [] ? manage_workers+0x120/0x120 [] kthread+0x9e/0xb0 [] kernel_thread_helper+0x4/0x10 [] ? kthread_freezable_should_stop+0x70/0x70 [] ? gs_change+0x13/0x13 Code: f3 49 89 d4 45 85 ed 4d 89 c6 48 8b 0f 74 48 48 85 c9 75 17 eb 41 0f 1f 80 00 00 00 00 41 83 ed 01 4c 89 f9 74 22 4d 85 ff 74 1d <4c> 8b 79 08 4c 89 e2 48 89 de 48 89 cf ff 11 4d 85 f6 74 04 41 RIP [] notifier_call_chain+0x46/0x80 RSP CR2: ffffffffa01af838 ---[ end trace 0100930068e73e6f ]--- BUG: unable to handle kernel paging request at fffffffffffffff8 IP: [] kthread_data+0x10/0x20 PGD 1a0d067 PUD 1a0e067 PMD 0 Oops: 0000 [#2] SMP Only i7core_edac and sb_edac have such issues because they have more than one memory controller which means they have to register mce decoder many times. v3->v2: remove dead code in i7core_edac, suggested by Mauro v2->v1: move register/unregister to the init/exit part Signed-off-by: Chen Gong --- drivers/edac/i7core_edac.c | 15 ++++----------- drivers/edac/sb_edac.c | 8 ++++---- 2 files changed, 8 insertions(+), 15 deletions(-) diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c index 85226cc..0fe2277 100644 --- a/drivers/edac/i7core_edac.c +++ b/drivers/edac/i7core_edac.c @@ -1932,12 +1932,6 @@ static int i7core_mce_check_error(struct notifier_block *nb, unsigned long val, if (mce->bank != 8) return NOTIFY_DONE; -#ifdef CONFIG_SMP - /* Only handle if it is the right mc controller */ - if (mce->socketid != pvt->i7core_dev->socket) - return NOTIFY_DONE; -#endif - smp_rmb(); if ((pvt->mce_out + 1) % MCE_LOG_LEN == pvt->mce_in) { smp_wmb(); @@ -2234,8 +2228,6 @@ static void i7core_unregister_mci(struct i7core_dev *i7core_dev) if (pvt->enable_scrub) disable_sdram_scrub_setting(mci); - mce_unregister_decode_chain(&i7_mce_dec); - /* Disable EDAC polling */ i7core_pci_ctl_release(pvt); @@ -2336,8 +2328,6 @@ static int i7core_register_mci(struct i7core_dev *i7core_dev) /* DCLK for scrub rate setting */ pvt->dclk_freq = get_dclk_freq(); - mce_register_decode_chain(&i7_mce_dec); - return 0; fail0: @@ -2481,8 +2471,10 @@ static int __init i7core_init(void) pci_rc = pci_register_driver(&i7core_driver); - if (pci_rc >= 0) + if (pci_rc >= 0) { + mce_register_decode_chain(&i7_mce_dec); return 0; + } i7core_printk(KERN_ERR, "Failed to register device with error %d.\n", pci_rc); @@ -2498,6 +2490,7 @@ static void __exit i7core_exit(void) { debugf2("MC: " __FILE__ ": %s()\n", __func__); pci_unregister_driver(&i7core_driver); + mce_unregister_decode_chain(&i7_mce_dec); } module_init(i7core_init); diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c index a203536..e9858ba 100644 --- a/drivers/edac/sb_edac.c +++ b/drivers/edac/sb_edac.c @@ -1669,8 +1669,6 @@ static void sbridge_unregister_mci(struct sbridge_dev *sbridge_dev) debugf0("MC: " __FILE__ ": %s(): mci = %p, dev = %p\n", __func__, mci, &sbridge_dev->pdev[0]->dev); - mce_unregister_decode_chain(&sbridge_mce_dec); - /* Remove MC sysfs nodes */ edac_mc_del_mc(mci->dev); @@ -1738,7 +1736,6 @@ static int sbridge_register_mci(struct sbridge_dev *sbridge_dev) goto fail0; } - mce_register_decode_chain(&sbridge_mce_dec); return 0; fail0: @@ -1867,8 +1864,10 @@ static int __init sbridge_init(void) pci_rc = pci_register_driver(&sbridge_driver); - if (pci_rc >= 0) + if (pci_rc >= 0) { + mce_register_decode_chain(&sbridge_mce_dec); return 0; + } sbridge_printk(KERN_ERR, "Failed to register device with error %d.\n", pci_rc); @@ -1884,6 +1883,7 @@ static void __exit sbridge_exit(void) { debugf2("MC: " __FILE__ ": %s()\n", __func__); pci_unregister_driver(&sbridge_driver); + mce_unregister_decode_chain(&sbridge_mce_dec); } module_init(sbridge_init); -- 1.7.10 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/