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path: root/drivers/firewire/fw-cdev.c
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Diffstat (limited to 'drivers/firewire/fw-cdev.c')
-rw-r--r--drivers/firewire/fw-cdev.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index 4a541921a14..c639915fc3c 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -113,6 +113,11 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
if (device == NULL)
return -ENODEV;
+ if (fw_device_is_shutdown(device)) {
+ fw_device_put(device);
+ return -ENODEV;
+ }
+
client = kzalloc(sizeof(*client), GFP_KERNEL);
if (client == NULL) {
fw_device_put(device);
@@ -200,6 +205,7 @@ fw_device_op_read(struct file *file,
return dequeue_event(client, buffer, count);
}
+/* caller must hold card->lock so that node pointers can be dereferenced here */
static void
fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
struct client *client)
@@ -209,7 +215,6 @@ fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
event->closure = client->bus_reset_closure;
event->type = FW_CDEV_EVENT_BUS_RESET;
event->generation = client->device->generation;
- smp_rmb(); /* node_id must not be older than generation */
event->node_id = client->device->node_id;
event->local_node_id = card->local_node->node_id;
event->bm_node_id = 0; /* FIXME: We don't track the BM. */
@@ -269,6 +274,7 @@ static int ioctl_get_info(struct client *client, void *buffer)
{
struct fw_cdev_get_info *get_info = buffer;
struct fw_cdev_event_bus_reset bus_reset;
+ struct fw_card *card = client->device->card;
unsigned long ret = 0;
client->version = get_info->version;
@@ -294,13 +300,17 @@ static int ioctl_get_info(struct client *client, void *buffer)
client->bus_reset_closure = get_info->bus_reset_closure;
if (get_info->bus_reset != 0) {
void __user *uptr = u64_to_uptr(get_info->bus_reset);
+ unsigned long flags;
+ spin_lock_irqsave(&card->lock, flags);
fill_bus_reset_event(&bus_reset, client);
+ spin_unlock_irqrestore(&card->lock, flags);
+
if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
return -EFAULT;
}
- get_info->card = client->device->card->index;
+ get_info->card = card->index;
return 0;
}
@@ -901,6 +911,9 @@ fw_device_op_ioctl(struct file *file,
{
struct client *client = file->private_data;
+ if (fw_device_is_shutdown(client->device))
+ return -ENODEV;
+
return dispatch_ioctl(client, cmd, (void __user *) arg);
}
@@ -911,6 +924,9 @@ fw_device_op_compat_ioctl(struct file *file,
{
struct client *client = file->private_data;
+ if (fw_device_is_shutdown(client->device))
+ return -ENODEV;
+
return dispatch_ioctl(client, cmd, compat_ptr(arg));
}
#endif
@@ -922,6 +938,9 @@ static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
unsigned long size;
int page_count, retval;
+ if (fw_device_is_shutdown(client->device))
+ return -ENODEV;
+
/* FIXME: We could support multiple buffers, but we don't. */
if (client->buffer.pages != NULL)
return -EBUSY;