From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by dpdk.org (Postfix) with ESMTP id 249EE1B124 for ; Thu, 18 Oct 2018 18:06:25 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 Oct 2018 09:06:25 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,396,1534834800"; d="scan'208";a="79039036" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.49]) ([10.237.221.49]) by fmsmga007.fm.intel.com with ESMTP; 18 Oct 2018 09:06:21 -0700 To: Jeff Guo , stephen@networkplumber.org, bruce.richardson@intel.com, konstantin.ananyev@intel.com, thomas@monjalon.net, shaopeng.he@intel.com Cc: dev@dpdk.org, helin.zhang@intel.com References: <1534502916-31636-9-git-send-email-jia.guo@intel.com> <1539844035-11524-1-git-send-email-jia.guo@intel.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1539844035-11524-1-git-send-email-jia.guo@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v1] igb_uio: fix unexpected removal for hot-unplug X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Oct 2018 16:06:26 -0000 On 10/18/2018 7:27 AM, Jeff Guo wrote: > When a device is hot-unplugged, pci_remove will be invoked unexpectedly > before pci_release, it will caused kernel hung issue which will throw the > error info of "Trying to free already-free IRQ XXX". And on the other hand, > if pci_remove before pci_release, the interrupt will not got chance to be > disabled. So this patch aim to fix this issue by adding pci_release call > in pci_remove, it will gurranty that all pci clean up will be done before > pci removal. > > Signed-off-by: Jeff Guo > --- > kernel/linux/igb_uio/igb_uio.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/kernel/linux/igb_uio/igb_uio.c b/kernel/linux/igb_uio/igb_uio.c > index fede66c..3cf394b 100644 > --- a/kernel/linux/igb_uio/igb_uio.c > +++ b/kernel/linux/igb_uio/igb_uio.c > @@ -570,6 +570,8 @@ igbuio_pci_remove(struct pci_dev *dev) > { > struct rte_uio_pci_dev *udev = pci_get_drvdata(dev); > > + igbuio_pci_release(&udev->info, NULL); > + Hi Jeff, This is simpler approach comparing to previous version. And do you know if igbuio_pci_release() won't be called after igbuio_pci_remove() because that will also cause crash, and indeed it will cause a crash in the uio too. The flow as far as I can see: when uioN device opened by application, igbuio_pci_open() is called. If device removed, I expect driver remove() function called, which has a call stack like below: igbuio_pci_remove() uio_unregister_device() uio_device_release() kfree(struct uio_device) After this point udev is freed and igbuio_pci_release() shouldn't be called, so I assume uioN device closed before this point but I couldn't find where, if not closed, closing it later will crash. I can't test the hotplug case, can you please confirm above patch fixing crashes you observed for your use cases? And for regular usecase this change shouldn't cause any problem, so at worst it may not be fixing all hotplug issues, which looks safe to get.