diff options
| -rw-r--r-- | drivers/firewire/core-cdev.c | 18 | ||||
| -rw-r--r-- | include/linux/firewire-cdev.h | 3 |
2 files changed, 13 insertions, 8 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c index 9b5915ebeb35..e6ad3bb6c1a6 100644 --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -253,14 +253,11 @@ static int fw_device_op_open(struct inode *inode, struct file *file) init_waitqueue_head(&client->wait); init_waitqueue_head(&client->tx_flush_wait); INIT_LIST_HEAD(&client->phy_receiver_link); + INIT_LIST_HEAD(&client->link); kref_init(&client->kref); file->private_data = client; - mutex_lock(&device->client_list_mutex); - list_add_tail(&client->link, &device->client_list); - mutex_unlock(&device->client_list_mutex); - return nonseekable_open(inode, file); } @@ -451,15 +448,20 @@ static int ioctl_get_info(struct client *client, union ioctl_arg *arg) if (ret != 0) return -EFAULT; + mutex_lock(&client->device->client_list_mutex); + client->bus_reset_closure = a->bus_reset_closure; if (a->bus_reset != 0) { fill_bus_reset_event(&bus_reset, client); - if (copy_to_user(u64_to_uptr(a->bus_reset), - &bus_reset, sizeof(bus_reset))) - return -EFAULT; + ret = copy_to_user(u64_to_uptr(a->bus_reset), + &bus_reset, sizeof(bus_reset)); } + if (ret == 0 && list_empty(&client->link)) + list_add_tail(&client->link, &client->device->client_list); - return 0; + mutex_unlock(&client->device->client_list_mutex); + + return ret ? -EFAULT : 0; } static int add_client_resource(struct client *client, diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h index 4ff09889c5c0..55814aa33be2 100644 --- a/include/linux/firewire-cdev.h +++ b/include/linux/firewire-cdev.h @@ -475,6 +475,9 @@ union fw_cdev_event { * of the bus. This does not cause a bus reset to happen. * @bus_reset_closure: Value of &closure in this and subsequent bus reset events * @card: The index of the card this device belongs to + * + * As a side effect, reception of %FW_CDEV_EVENT_BUS_RESET events to be read(2) + * is started by this ioctl. */ struct fw_cdev_get_info { __u32 version; |