From 044ce581ab28f640d3997cb38e1ddda782238abb Mon Sep 17 00:00:00 2001 From: Takashi Sakamoto Date: Mon, 5 Aug 2024 17:53:54 +0900 Subject: [PATCH] firewire: core: use guard macro to maintain the list of cdev clients The core function maintains userspace clients by the list in fw_device object associated to the operated character device. The concurrent access to the list is protected by mutex in the object. This commit uses guard macro to maintain the mutex. Link: https://lore.kernel.org/r/20240805085408.251763-4-o-takashi@sakamocchi.jp Signed-off-by: Takashi Sakamoto --- drivers/firewire/core-cdev.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c index 619048dcfd72..a51aabb963fb 100644 --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -375,10 +375,10 @@ static void for_each_client(struct fw_device *device, { struct client *c; - mutex_lock(&device->client_list_mutex); + guard(mutex)(&device->client_list_mutex); + list_for_each_entry(c, &device->client_list, link) callback(c); - mutex_unlock(&device->client_list_mutex); } static int schedule_reallocations(int id, void *p, void *data) @@ -470,7 +470,7 @@ static int ioctl_get_info(struct client *client, union ioctl_arg *arg) if (ret != 0) return -EFAULT; - mutex_lock(&client->device->client_list_mutex); + guard(mutex)(&client->device->client_list_mutex); client->bus_reset_closure = a->bus_reset_closure; if (a->bus_reset != 0) { @@ -481,8 +481,6 @@ static int ioctl_get_info(struct client *client, union ioctl_arg *arg) if (ret == 0 && list_empty(&client->link)) list_add_tail(&client->link, &client->device->client_list); - mutex_unlock(&client->device->client_list_mutex); - return ret ? -EFAULT : 0; } @@ -1884,9 +1882,8 @@ static int fw_device_op_release(struct inode *inode, struct file *file) list_del(&client->phy_receiver_link); spin_unlock_irq(&client->device->card->lock); - mutex_lock(&client->device->client_list_mutex); - list_del(&client->link); - mutex_unlock(&client->device->client_list_mutex); + scoped_guard(mutex, &client->device->client_list_mutex) + list_del(&client->link); if (client->iso_context) fw_iso_context_destroy(client->iso_context); -- 2.51.0