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author | 2013-07-03 03:05:37 -0700 | |
---|---|---|
committer | 2013-07-07 18:35:56 -0700 | |
commit | b2cb96494d83b894a43ba8b9023eead8ff50684b (patch) | |
tree | b16b85fe4b65448fb8d03c004d8a7d83c988c412 /drivers/infiniband | |
parent | iscsi-target: Fix ISCSI_OP_SCSI_TMFUNC handling for iser (diff) | |
download | linux-b2cb96494d83b894a43ba8b9023eead8ff50684b.tar.gz linux-b2cb96494d83b894a43ba8b9023eead8ff50684b.tar.bz2 linux-b2cb96494d83b894a43ba8b9023eead8ff50684b.zip |
iser-target: Fix session reset bug with RDMA_CM_EVENT_DISCONNECTED
This patch addresses a bug where RDMA_CM_EVENT_DISCONNECTED may occur
before the connection shutdown has been completed by rx/tx threads,
that causes isert_free_conn() to wait indefinately on ->conn_wait.
This patch allows isert_disconnect_work code to invoke rdma_disconnect
when isert_disconnect_work() process context is started by client
session reset before isert_free_conn() code has been reached.
It also adds isert_conn->conn_mutex protection for ->state within
isert_disconnect_work(), isert_cq_comp_err() and isert_free_conn()
code, along with isert_check_state() for wait_event usage.
(v2: Add explicit iscsit_cause_connection_reinstatement call
during isert_disconnect_work() to force conn reset)
Cc: stable@vger.kernel.org # 3.10+
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r-- | drivers/infiniband/ulp/isert/ib_isert.c | 70 | ||||
-rw-r--r-- | drivers/infiniband/ulp/isert/ib_isert.h | 1 |
2 files changed, 61 insertions, 10 deletions
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c index 9efbf13007e4..d6cc5999d793 100644 --- a/drivers/infiniband/ulp/isert/ib_isert.c +++ b/drivers/infiniband/ulp/isert/ib_isert.c @@ -388,6 +388,7 @@ isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) init_waitqueue_head(&isert_conn->conn_wait_comp_err); kref_init(&isert_conn->conn_kref); kref_get(&isert_conn->conn_kref); + mutex_init(&isert_conn->conn_mutex); cma_id->context = isert_conn; isert_conn->conn_cm_id = cma_id; @@ -540,15 +541,32 @@ isert_disconnect_work(struct work_struct *work) struct isert_conn, conn_logout_work); pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); - + mutex_lock(&isert_conn->conn_mutex); isert_conn->state = ISER_CONN_DOWN; if (isert_conn->post_recv_buf_count == 0 && atomic_read(&isert_conn->post_send_buf_count) == 0) { pr_debug("Calling wake_up(&isert_conn->conn_wait);\n"); - wake_up(&isert_conn->conn_wait); + mutex_unlock(&isert_conn->conn_mutex); + goto wake_up; + } + if (!isert_conn->conn_cm_id) { + mutex_unlock(&isert_conn->conn_mutex); + isert_put_conn(isert_conn); + return; + } + if (!isert_conn->logout_posted) { + pr_debug("Calling rdma_disconnect for !logout_posted from" + " isert_disconnect_work\n"); + rdma_disconnect(isert_conn->conn_cm_id); + mutex_unlock(&isert_conn->conn_mutex); + iscsit_cause_connection_reinstatement(isert_conn->conn, 0); + goto wake_up; } + mutex_unlock(&isert_conn->conn_mutex); +wake_up: + wake_up(&isert_conn->conn_wait); isert_put_conn(isert_conn); } @@ -1439,7 +1457,11 @@ isert_cq_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn) pr_debug("isert_cq_comp_err >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); pr_debug("Calling wake_up from isert_cq_comp_err\n"); - isert_conn->state = ISER_CONN_TERMINATING; + mutex_lock(&isert_conn->conn_mutex); + if (isert_conn->state != ISER_CONN_DOWN) + isert_conn->state = ISER_CONN_TERMINATING; + mutex_unlock(&isert_conn->conn_mutex); + wake_up(&isert_conn->conn_wait_comp_err); } } @@ -2209,6 +2231,17 @@ isert_free_np(struct iscsi_np *np) kfree(isert_np); } +static int isert_check_state(struct isert_conn *isert_conn, int state) +{ + int ret; + + mutex_lock(&isert_conn->conn_mutex); + ret = (isert_conn->state == state); + mutex_unlock(&isert_conn->conn_mutex); + + return ret; +} + static void isert_free_conn(struct iscsi_conn *conn) { struct isert_conn *isert_conn = conn->context; @@ -2218,26 +2251,43 @@ static void isert_free_conn(struct iscsi_conn *conn) * Decrement post_send_buf_count for special case when called * from isert_do_control_comp() -> iscsit_logout_post_handler() */ + mutex_lock(&isert_conn->conn_mutex); if (isert_conn->logout_posted) atomic_dec(&isert_conn->post_send_buf_count); - if (isert_conn->conn_cm_id) + if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) { + pr_debug("Calling rdma_disconnect from isert_free_conn\n"); rdma_disconnect(isert_conn->conn_cm_id); + } /* * Only wait for conn_wait_comp_err if the isert_conn made it * into full feature phase.. */ - if (isert_conn->state > ISER_CONN_INIT) { + if (isert_conn->state == ISER_CONN_UP) { pr_debug("isert_free_conn: Before wait_event comp_err %d\n", isert_conn->state); + mutex_unlock(&isert_conn->conn_mutex); + wait_event(isert_conn->conn_wait_comp_err, - isert_conn->state == ISER_CONN_TERMINATING); - pr_debug("isert_free_conn: After wait_event #1 >>>>>>>>>>>>\n"); + (isert_check_state(isert_conn, ISER_CONN_TERMINATING))); + + wait_event(isert_conn->conn_wait, + (isert_check_state(isert_conn, ISER_CONN_DOWN))); + + isert_put_conn(isert_conn); + return; + } + if (isert_conn->state == ISER_CONN_INIT) { + mutex_unlock(&isert_conn->conn_mutex); + isert_put_conn(isert_conn); + return; } + pr_debug("isert_free_conn: wait_event conn_wait %d\n", + isert_conn->state); + mutex_unlock(&isert_conn->conn_mutex); - pr_debug("isert_free_conn: wait_event conn_wait %d\n", isert_conn->state); - wait_event(isert_conn->conn_wait, isert_conn->state == ISER_CONN_DOWN); - pr_debug("isert_free_conn: After wait_event #2 >>>>>>>>>>>>>>>>>>>>\n"); + wait_event(isert_conn->conn_wait, + (isert_check_state(isert_conn, ISER_CONN_DOWN))); isert_put_conn(isert_conn); } diff --git a/drivers/infiniband/ulp/isert/ib_isert.h b/drivers/infiniband/ulp/isert/ib_isert.h index b104f4c2cd38..5795c82a2306 100644 --- a/drivers/infiniband/ulp/isert/ib_isert.h +++ b/drivers/infiniband/ulp/isert/ib_isert.h @@ -102,6 +102,7 @@ struct isert_conn { struct ib_qp *conn_qp; struct isert_device *conn_device; struct work_struct conn_logout_work; + struct mutex conn_mutex; wait_queue_head_t conn_wait; wait_queue_head_t conn_wait_comp_err; struct kref conn_kref; |