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path: root/drivers/net/netdevsim/bus.c
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Diffstat (limited to 'drivers/net/netdevsim/bus.c')
-rw-r--r--drivers/net/netdevsim/bus.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c
index 0787ad252d..bcbc1e19ed 100644
--- a/drivers/net/netdevsim/bus.c
+++ b/drivers/net/netdevsim/bus.c
@@ -3,11 +3,13 @@
* Copyright (C) 2019 Mellanox Technologies. All rights reserved
*/
+#include <linux/completion.h>
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mutex.h>
+#include <linux/refcount.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
@@ -17,6 +19,8 @@ static DEFINE_IDA(nsim_bus_dev_ids);
static LIST_HEAD(nsim_bus_dev_list);
static DEFINE_MUTEX(nsim_bus_dev_list_lock);
static bool nsim_bus_enable;
+static refcount_t nsim_bus_devs; /* Including the bus itself. */
+static DECLARE_COMPLETION(nsim_bus_devs_released);
static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
{
@@ -121,6 +125,8 @@ static void nsim_bus_dev_release(struct device *dev)
nsim_bus_dev = container_of(dev, struct nsim_bus_dev, dev);
kfree(nsim_bus_dev);
+ if (refcount_dec_and_test(&nsim_bus_devs))
+ complete(&nsim_bus_devs_released);
}
static struct device_type nsim_bus_dev_type = {
@@ -170,6 +176,7 @@ new_device_store(const struct bus_type *bus, const char *buf, size_t count)
goto err;
}
+ refcount_inc(&nsim_bus_devs);
/* Allow using nsim_bus_dev */
smp_store_release(&nsim_bus_dev->init, true);
@@ -326,6 +333,7 @@ int nsim_bus_init(void)
err = driver_register(&nsim_driver);
if (err)
goto err_bus_unregister;
+ refcount_set(&nsim_bus_devs, 1);
/* Allow using resources */
smp_store_release(&nsim_bus_enable, true);
return 0;
@@ -341,6 +349,8 @@ void nsim_bus_exit(void)
/* Disallow using resources */
smp_store_release(&nsim_bus_enable, false);
+ if (refcount_dec_and_test(&nsim_bus_devs))
+ complete(&nsim_bus_devs_released);
mutex_lock(&nsim_bus_dev_list_lock);
list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
@@ -349,6 +359,8 @@ void nsim_bus_exit(void)
}
mutex_unlock(&nsim_bus_dev_list_lock);
+ wait_for_completion(&nsim_bus_devs_released);
+
driver_unregister(&nsim_driver);
bus_unregister(&nsim_bus);
}