Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752668AbbEGJsj (ORCPT ); Thu, 7 May 2015 05:48:39 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:47866 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752603AbbEGJsd (ORCPT ); Thu, 7 May 2015 05:48:33 -0400 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Sagi Grimberg , Nicholas Bellinger , Luis Henriques Subject: [PATCH 3.16.y-ckt 107/180] iser-target: Fix possible deadlock in RDMA_CM connection error Date: Thu, 7 May 2015 10:45:16 +0100 Message-Id: <1430991989-23170-108-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1430991989-23170-1-git-send-email-luis.henriques@canonical.com> References: <1430991989-23170-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.16 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2887 Lines: 85 3.16.7-ckt11 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Sagi Grimberg commit 4a579da2586bd3b79b025947ea24ede2bbfede62 upstream. Before we reach to connection established we may get an error event. In this case the core won't teardown this connection (never established it), so we take care of freeing it ourselves. Signed-off-by: Sagi Grimberg Signed-off-by: Nicholas Bellinger [ luis: backported to 3.16: adjusted context ] Signed-off-by: Luis Henriques --- drivers/infiniband/ulp/isert/ib_isert.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c index 42dc264b7271..31939ba1d238 100644 --- a/drivers/infiniband/ulp/isert/ib_isert.c +++ b/drivers/infiniband/ulp/isert/ib_isert.c @@ -218,7 +218,7 @@ fail: static void isert_free_rx_descriptors(struct isert_conn *isert_conn) { - struct ib_device *ib_dev = isert_conn->conn_cm_id->device; + struct ib_device *ib_dev = isert_conn->conn_device->ib_device; struct iser_rx_desc *rx_desc; int i; @@ -737,8 +737,8 @@ out: static void isert_connect_release(struct isert_conn *isert_conn) { - struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct isert_device *device = isert_conn->conn_device; + struct ib_device *ib_dev = device->ib_device; int cq_index; pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); @@ -747,7 +747,8 @@ isert_connect_release(struct isert_conn *isert_conn) isert_conn_free_fastreg_pool(isert_conn); isert_free_rx_descriptors(isert_conn); - rdma_destroy_id(isert_conn->conn_cm_id); + if (isert_conn->conn_cm_id) + rdma_destroy_id(isert_conn->conn_cm_id); if (isert_conn->conn_qp) { cq_index = ((struct isert_cq_desc *) @@ -905,12 +906,15 @@ isert_disconnected_handler(struct rdma_cm_id *cma_id, return 0; } -static void +static int isert_connect_error(struct rdma_cm_id *cma_id) { struct isert_conn *isert_conn = cma_id->qp->qp_context; + isert_conn->conn_cm_id = NULL; isert_put_conn(isert_conn); + + return -1; } static int @@ -940,7 +944,7 @@ isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */ case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */ case RDMA_CM_EVENT_CONNECT_ERROR: - isert_connect_error(cma_id); + ret = isert_connect_error(cma_id); break; default: pr_err("Unhandled RDMA CMA event: %d\n", event->event); -- 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/