Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/net/netdevsim/sdev.c b/drivers/net/netdevsim/sdev.c
new file mode 100644
index 0000000..6712da3
--- /dev/null
+++ b/drivers/net/netdevsim/sdev.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019 Mellanox Technologies. All rights reserved */
+
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include "netdevsim.h"
+
+static struct dentry *nsim_sdev_ddir;
+
+static u32 nsim_sdev_id;
+
+struct netdevsim_shared_dev *nsim_sdev_get(struct netdevsim *joinns)
+{
+ struct netdevsim_shared_dev *sdev;
+ char sdev_ddir_name[10];
+ int err;
+
+ if (joinns) {
+ if (WARN_ON(!joinns->sdev))
+ return ERR_PTR(-EINVAL);
+ sdev = joinns->sdev;
+ sdev->refcnt++;
+ return sdev;
+ }
+
+ sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
+ if (!sdev)
+ return ERR_PTR(-ENOMEM);
+ sdev->refcnt = 1;
+ sdev->switch_id = nsim_sdev_id++;
+
+ sprintf(sdev_ddir_name, "%u", sdev->switch_id);
+ sdev->ddir = debugfs_create_dir(sdev_ddir_name, nsim_sdev_ddir);
+ if (IS_ERR_OR_NULL(sdev->ddir)) {
+ err = PTR_ERR_OR_ZERO(sdev->ddir) ?: -EINVAL;
+ goto err_sdev_free;
+ }
+
+ return sdev;
+
+err_sdev_free:
+ nsim_sdev_id--;
+ kfree(sdev);
+ return ERR_PTR(err);
+}
+
+void nsim_sdev_put(struct netdevsim_shared_dev *sdev)
+{
+ if (--sdev->refcnt)
+ return;
+ debugfs_remove_recursive(sdev->ddir);
+ kfree(sdev);
+}
+
+int nsim_sdev_init(void)
+{
+ nsim_sdev_ddir = debugfs_create_dir(DRV_NAME "_sdev", NULL);
+ if (IS_ERR_OR_NULL(nsim_sdev_ddir))
+ return -ENOMEM;
+ return 0;
+}
+
+void nsim_sdev_exit(void)
+{
+ debugfs_remove_recursive(nsim_sdev_ddir);
+}