[1/2] eventdev: fix race condition in fast-path set function

Message ID 20230220060839.1267349-1-ashok.k.kaladi@intel.com (mailing list archive)
State New
Delegated to: Thomas Monjalon
Series [1/2] eventdev: fix race condition in fast-path set function |


Context Check Description
ci/checkpatch warning coding style issues

Commit Message

Ashok Kaladi Feb. 20, 2023, 6:08 a.m. UTC
  If eventdev enqueue or dequeue function is called during
event_dev_fp_ops_set(), it may get pre-empted after setting
the function pointers, but before setting the pointer to port data.
In this case the newly registered enqueue/dequeue function will use
dummy port data and end up in seg fault.

This patch moves the updation of data element to the beginning of
event_dev_fp_ops_set() function.

Fixes: d35e61322de5 ("eventdev: move inline APIs into separate structure")
Cc: stable@dpdk.org

Signed-off-by: Ashok Kaladi <ashok.k.kaladi@intel.com>


diff --git a/.mailmap b/.mailmap
index 5015494210..bbf6744278 100644
--- a/.mailmap
+++ b/.mailmap
@@ -132,6 +132,7 @@  Ashish Jain <ashish.jain@nxp.com>
 Ashish Paul <apaul@juniper.net>
 Ashish Sadanandan <ashish.sadanandan@gmail.com>
 Ashish Shah <ashish.n.shah@intel.com>
+Ashok Kaladi <ashok.k.kaladi@intel.com>
 Ashwin Sekhar T K <asekhar@marvell.com> <ashwin.sekhar@caviumnetworks.com>
 Asim Jamshed <asim.jamshed@gmail.com>
 Aviad Yehezkel <aviadye@mellanox.com>
diff --git a/lib/eventdev/eventdev_private.c b/lib/eventdev/eventdev_private.c
index 1d3d9d357e..539aade780 100644
--- a/lib/eventdev/eventdev_private.c
+++ b/lib/eventdev/eventdev_private.c
@@ -107,6 +107,7 @@  void
 event_dev_fp_ops_set(struct rte_event_fp_ops *fp_op,
 		     const struct rte_eventdev *dev)
+	fp_op->data = dev->data->ports;
 	fp_op->enqueue = dev->enqueue;
 	fp_op->enqueue_burst = dev->enqueue_burst;
 	fp_op->enqueue_new_burst = dev->enqueue_new_burst;
@@ -117,5 +118,4 @@  event_dev_fp_ops_set(struct rte_event_fp_ops *fp_op,
 	fp_op->txa_enqueue = dev->txa_enqueue;
 	fp_op->txa_enqueue_same_dest = dev->txa_enqueue_same_dest;
 	fp_op->ca_enqueue = dev->ca_enqueue;
-	fp_op->data = dev->data->ports;