diff options
Diffstat (limited to 'drivers/net/netdevsim/bus.c')
| -rw-r--r-- | drivers/net/netdevsim/bus.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c index 0787ad252dd9..bcbc1e19edde 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); } |