From mboxrd@z Thu Jan 1 00:00:00 1970 From: Darek Stojaczyk Subject: [PATCH v2] dev: fix attach rollback of a device that was already attached Date: Fri, 23 Nov 2018 22:26:40 +0100 Message-ID: <20181123212640.111642-1-dariusz.stojaczyk@intel.com> References: <20181123144506.95367-1-dariusz.stojaczyk@intel.com> Cc: thomas@monjalon.net, Darek Stojaczyk , qi.z.zhang@intel.com To: dev@dpdk.org Return-path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by dpdk.org (Postfix) with ESMTP id 05B2D1B5BD for ; Fri, 23 Nov 2018 22:38:17 +0100 (CET) In-Reply-To: <20181123144506.95367-1-dariusz.stojaczyk@intel.com> List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" When primary process receives an IPC attach request of a device that's already locally-attached, it doesn't setup its variables properly and is prone to segfaulting on a subsequent rollback. `ret = local_dev_probe(req->devargs, &dev)` The above function will set `dev` pointer to the proper device *unless* it returns with error. One of those errors is -EEXIST, which the hotplug function explicitly ignores. For -EEXIST, it proceeds with attaching the device and expects the dev pointer to be valid. This patch makes `local_dev_probe` set the dev pointer even if it returns -EEXIST. Fixes: ac9e4a17370f ("eal: support attach/detach shared device from secondary") Cc: qi.z.zhang@intel.com Signed-off-by: Darek Stojaczyk --- Changes since v1: * attempt to detach the device in primary process (Qi) lib/librte_eal/common/eal_common_dev.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c index 1fdc9ab17..a08dc085f 100644 --- a/lib/librte_eal/common/eal_common_dev.c +++ b/lib/librte_eal/common/eal_common_dev.c @@ -168,16 +168,14 @@ local_dev_probe(const char *devargs, struct rte_device **new_dev) } ret = dev->bus->plug(dev); - if (ret) { - if (rte_dev_is_probed(dev)) /* if already succeeded earlier */ - return ret; /* no rollback */ + if (ret && !rte_dev_is_probed(dev)) { /* if hasn't ever succeeded */ RTE_LOG(ERR, EAL, "Driver cannot attach the device (%s)\n", dev->name); goto err_devarg; } *new_dev = dev; - return 0; + return ret; err_devarg: if (rte_devargs_remove(da) != 0) { -- 2.17.1