From: Parav Pandit <parav@mellanox.com>
Date: Sun, 29 Jul 2018 11:53:14 +0300
Subject: RDMA/core: Avoid holding lock while initializing fields on stack
Patch-mainline: v4.19-rc1
Git-commit: 7582df826734bad71522b442b8977e3dee63a77a
References: bsc#1103992 FATE#326009
In various functions rdma_cm_event is zero initialized on stack using
memset() while holding lock which is not necessary.
Therefore, don't hold the lock while initializing on stack.
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/core/cma.c | 36 ++++++++++++++----------------------
1 file changed, 14 insertions(+), 22 deletions(-)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -1787,7 +1787,7 @@ static int cma_ib_handler(struct ib_cm_i
const struct ib_cm_event *ib_event)
{
struct rdma_id_private *id_priv = cm_id->context;
- struct rdma_cm_event event;
+ struct rdma_cm_event event = {};
int ret = 0;
mutex_lock(&id_priv->handler_mutex);
@@ -1797,7 +1797,6 @@ static int cma_ib_handler(struct ib_cm_i
id_priv->state != RDMA_CM_DISCONNECT))
goto out;
- memset(&event, 0, sizeof event);
switch (ib_event->event) {
case IB_CM_REQ_ERROR:
case IB_CM_REP_ERROR:
@@ -2003,7 +2002,7 @@ static int cma_req_handler(struct ib_cm_
const struct ib_cm_event *ib_event)
{
struct rdma_id_private *listen_id, *conn_id = NULL;
- struct rdma_cm_event event;
+ struct rdma_cm_event event = {};
struct net_device *net_dev;
u8 offset;
int ret;
@@ -2023,7 +2022,6 @@ static int cma_req_handler(struct ib_cm_
goto err1;
}
- memset(&event, 0, sizeof event);
offset = cma_user_data_offset(listen_id);
event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
@@ -2132,7 +2130,7 @@ EXPORT_SYMBOL(rdma_read_gids);
static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
{
struct rdma_id_private *id_priv = iw_id->context;
- struct rdma_cm_event event;
+ struct rdma_cm_event event = {};
int ret = 0;
struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
@@ -2141,7 +2139,6 @@ static int cma_iw_handler(struct iw_cm_i
if (id_priv->state != RDMA_CM_CONNECT)
goto out;
- memset(&event, 0, sizeof event);
switch (iw_event->event) {
case IW_CM_EVENT_CLOSE:
event.event = RDMA_CM_EVENT_DISCONNECTED;
@@ -2201,11 +2198,17 @@ static int iw_conn_req_handler(struct iw
{
struct rdma_cm_id *new_cm_id;
struct rdma_id_private *listen_id, *conn_id;
- struct rdma_cm_event event;
+ struct rdma_cm_event event = {};
int ret = -ECONNABORTED;
struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
+ event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
+ event.param.conn.private_data = iw_event->private_data;
+ event.param.conn.private_data_len = iw_event->private_data_len;
+ event.param.conn.initiator_depth = iw_event->ird;
+ event.param.conn.responder_resources = iw_event->ord;
+
listen_id = cm_id->context;
mutex_lock(&listen_id->handler_mutex);
@@ -2247,13 +2250,6 @@ static int iw_conn_req_handler(struct iw
memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
- memset(&event, 0, sizeof event);
- event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
- event.param.conn.private_data = iw_event->private_data;
- event.param.conn.private_data_len = iw_event->private_data_len;
- event.param.conn.initiator_depth = iw_event->ird;
- event.param.conn.responder_resources = iw_event->ord;
-
/*
* Protect against the user destroying conn_id from another thread
* until we're done accessing it.
@@ -2860,9 +2856,8 @@ static void addr_handler(int status, str
struct rdma_dev_addr *dev_addr, void *context)
{
struct rdma_id_private *id_priv = context;
- struct rdma_cm_event event;
+ struct rdma_cm_event event = {};
- memset(&event, 0, sizeof event);
mutex_lock(&id_priv->handler_mutex);
if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
RDMA_CM_ADDR_RESOLVED))
@@ -3491,7 +3486,7 @@ static int cma_sidr_rep_handler(struct i
const struct ib_cm_event *ib_event)
{
struct rdma_id_private *id_priv = cm_id->context;
- struct rdma_cm_event event;
+ struct rdma_cm_event event = {};
const struct ib_cm_sidr_rep_event_param *rep =
&ib_event->param.sidr_rep_rcvd;
int ret = 0;
@@ -3500,7 +3495,6 @@ static int cma_sidr_rep_handler(struct i
if (id_priv->state != RDMA_CM_CONNECT)
goto out;
- memset(&event, 0, sizeof event);
switch (ib_event->event) {
case IB_CM_SIDR_REQ_ERROR:
event.event = RDMA_CM_EVENT_UNREACHABLE;
@@ -3972,7 +3966,7 @@ static int cma_ib_mc_handler(int status,
{
struct rdma_id_private *id_priv;
struct cma_multicast *mc = multicast->context;
- struct rdma_cm_event event;
+ struct rdma_cm_event event = {};
int ret = 0;
id_priv = mc->id_priv;
@@ -3996,7 +3990,6 @@ static int cma_ib_mc_handler(int status,
}
mutex_unlock(&id_priv->qp_mutex);
- memset(&event, 0, sizeof event);
event.status = status;
event.param.ud.private_data = mc->context;
if (!status) {
@@ -4441,7 +4434,7 @@ free_cma_dev:
static int cma_remove_id_dev(struct rdma_id_private *id_priv)
{
- struct rdma_cm_event event;
+ struct rdma_cm_event event = {};
enum rdma_cm_state state;
int ret = 0;
@@ -4457,7 +4450,6 @@ static int cma_remove_id_dev(struct rdma
if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
goto out;
- memset(&event, 0, sizeof event);
event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
ret = id_priv->id.event_handler(&id_priv->id, &event);
out: