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authorLinus Torvalds <torvalds@linux-foundation.org>2009-12-08 08:13:10 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-08 08:13:10 -0800
commitbb592cf474404e51cbf3c419fb72fda83c4b7d72 (patch)
tree05823f536d5f095857a7aff732e205d249e4b7a1 /drivers/firewire/core-cdev.c
parent79c9601c2e0dbbe69895d302de4d19f3a31fbd30 (diff)
parentaf0940dac37545b1e7900b19c464fb6367d3f82f (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6: ieee1394: Use hweight32 firewire: cdev: reduce stack usage by ioctl_dispatch firewire: ohci: 0 may be a valid DMA address firewire: core: WARN on wrong usage of core transaction functions firewire: core: optimize Topology Map creation firewire: core: clarify generate_config_rom usage firewire: optimize config ROM creation firewire: cdev: normalize variable names firewire: normalize style of queue_work wrappers firewire: cdev: fix memory leak in an error path
Diffstat (limited to 'drivers/firewire/core-cdev.c')
-rw-r--r--drivers/firewire/core-cdev.c113
1 files changed, 67 insertions, 46 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 5089331544ed..231e6ee5ba43 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -130,9 +130,22 @@ struct iso_resource {
struct iso_resource_event *e_alloc, *e_dealloc;
};
-static void schedule_iso_resource(struct iso_resource *);
static void release_iso_resource(struct client *, struct client_resource *);
+static void schedule_iso_resource(struct iso_resource *r, unsigned long delay)
+{
+ client_get(r->client);
+ if (!schedule_delayed_work(&r->work, delay))
+ client_put(r->client);
+}
+
+static void schedule_if_iso_resource(struct client_resource *resource)
+{
+ if (resource->release == release_iso_resource)
+ schedule_iso_resource(container_of(resource,
+ struct iso_resource, resource), 0);
+}
+
/*
* dequeue_event() just kfree()'s the event, so the event has to be
* the first field in a struct XYZ_event.
@@ -166,7 +179,7 @@ struct iso_interrupt_event {
struct iso_resource_event {
struct event event;
- struct fw_cdev_event_iso_resource resource;
+ struct fw_cdev_event_iso_resource iso_resource;
};
static inline void __user *u64_to_uptr(__u64 value)
@@ -314,11 +327,8 @@ static void for_each_client(struct fw_device *device,
static int schedule_reallocations(int id, void *p, void *data)
{
- struct client_resource *r = p;
+ schedule_if_iso_resource(p);
- if (r->release == release_iso_resource)
- schedule_iso_resource(container_of(r,
- struct iso_resource, resource));
return 0;
}
@@ -414,9 +424,7 @@ static int add_client_resource(struct client *client,
&resource->handle);
if (ret >= 0) {
client_get(client);
- if (resource->release == release_iso_resource)
- schedule_iso_resource(container_of(resource,
- struct iso_resource, resource));
+ schedule_if_iso_resource(resource);
}
spin_unlock_irqrestore(&client->lock, flags);
@@ -428,26 +436,26 @@ static int add_client_resource(struct client *client,
static int release_client_resource(struct client *client, u32 handle,
client_resource_release_fn_t release,
- struct client_resource **resource)
+ struct client_resource **return_resource)
{
- struct client_resource *r;
+ struct client_resource *resource;
spin_lock_irq(&client->lock);
if (client->in_shutdown)
- r = NULL;
+ resource = NULL;
else
- r = idr_find(&client->resource_idr, handle);
- if (r && r->release == release)
+ resource = idr_find(&client->resource_idr, handle);
+ if (resource && resource->release == release)
idr_remove(&client->resource_idr, handle);
spin_unlock_irq(&client->lock);
- if (!(r && r->release == release))
+ if (!(resource && resource->release == release))
return -EINVAL;
- if (resource)
- *resource = r;
+ if (return_resource)
+ *return_resource = resource;
else
- r->release(client, r);
+ resource->release(client, resource);
client_put(client);
@@ -699,6 +707,7 @@ static int ioctl_send_response(struct client *client, void *buffer)
struct fw_cdev_send_response *request = buffer;
struct client_resource *resource;
struct inbound_transaction_resource *r;
+ int ret = 0;
if (release_client_resource(client, request->handle,
release_request, &resource) < 0)
@@ -708,13 +717,17 @@ static int ioctl_send_response(struct client *client, void *buffer)
resource);
if (request->length < r->length)
r->length = request->length;
- if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
- return -EFAULT;
+
+ if (copy_from_user(r->data, u64_to_uptr(request->data), r->length)) {
+ ret = -EFAULT;
+ goto out;
+ }
fw_send_response(client->device->card, r->request, request->rcode);
+ out:
kfree(r);
- return 0;
+ return ret;
}
static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
@@ -1028,8 +1041,7 @@ static void iso_resource_work(struct work_struct *work)
/* Allow 1000ms grace period for other reallocations. */
if (todo == ISO_RES_ALLOC &&
time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
- if (schedule_delayed_work(&r->work, DIV_ROUND_UP(HZ, 3)))
- client_get(client);
+ schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3));
skip = true;
} else {
/* We could be called twice within the same generation. */
@@ -1097,12 +1109,12 @@ static void iso_resource_work(struct work_struct *work)
e = r->e_dealloc;
r->e_dealloc = NULL;
}
- e->resource.handle = r->resource.handle;
- e->resource.channel = channel;
- e->resource.bandwidth = bandwidth;
+ e->iso_resource.handle = r->resource.handle;
+ e->iso_resource.channel = channel;
+ e->iso_resource.bandwidth = bandwidth;
queue_event(client, &e->event,
- &e->resource, sizeof(e->resource), NULL, 0);
+ &e->iso_resource, sizeof(e->iso_resource), NULL, 0);
if (free) {
cancel_delayed_work(&r->work);
@@ -1114,13 +1126,6 @@ static void iso_resource_work(struct work_struct *work)
client_put(client);
}
-static void schedule_iso_resource(struct iso_resource *r)
-{
- client_get(r->client);
- if (!schedule_delayed_work(&r->work, 0))
- client_put(r->client);
-}
-
static void release_iso_resource(struct client *client,
struct client_resource *resource)
{
@@ -1129,7 +1134,7 @@ static void release_iso_resource(struct client *client,
spin_lock_irq(&client->lock);
r->todo = ISO_RES_DEALLOC;
- schedule_iso_resource(r);
+ schedule_iso_resource(r, 0);
spin_unlock_irq(&client->lock);
}
@@ -1162,10 +1167,10 @@ static int init_iso_resource(struct client *client,
r->e_alloc = e1;
r->e_dealloc = e2;
- e1->resource.closure = request->closure;
- e1->resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
- e2->resource.closure = request->closure;
- e2->resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
+ e1->iso_resource.closure = request->closure;
+ e1->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
+ e2->iso_resource.closure = request->closure;
+ e2->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
if (todo == ISO_RES_ALLOC) {
r->resource.release = release_iso_resource;
@@ -1175,7 +1180,7 @@ static int init_iso_resource(struct client *client,
} else {
r->resource.release = NULL;
r->resource.handle = -1;
- schedule_iso_resource(r);
+ schedule_iso_resource(r, 0);
}
request->handle = r->resource.handle;
@@ -1295,7 +1300,23 @@ static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
static int dispatch_ioctl(struct client *client,
unsigned int cmd, void __user *arg)
{
- char buffer[256];
+ char buffer[sizeof(union {
+ struct fw_cdev_get_info _00;
+ struct fw_cdev_send_request _01;
+ struct fw_cdev_allocate _02;
+ struct fw_cdev_deallocate _03;
+ struct fw_cdev_send_response _04;
+ struct fw_cdev_initiate_bus_reset _05;
+ struct fw_cdev_add_descriptor _06;
+ struct fw_cdev_remove_descriptor _07;
+ struct fw_cdev_create_iso_context _08;
+ struct fw_cdev_queue_iso _09;
+ struct fw_cdev_start_iso _0a;
+ struct fw_cdev_stop_iso _0b;
+ struct fw_cdev_get_cycle_timer _0c;
+ struct fw_cdev_allocate_iso_resource _0d;
+ struct fw_cdev_send_stream_packet _13;
+ })];
int ret;
if (_IOC_TYPE(cmd) != '#' ||
@@ -1390,10 +1411,10 @@ static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
static int shutdown_resource(int id, void *p, void *data)
{
- struct client_resource *r = p;
+ struct client_resource *resource = p;
struct client *client = data;
- r->release(client, r);
+ resource->release(client, resource);
client_put(client);
return 0;
@@ -1402,7 +1423,7 @@ static int shutdown_resource(int id, void *p, void *data)
static int fw_device_op_release(struct inode *inode, struct file *file)
{
struct client *client = file->private_data;
- struct event *e, *next_e;
+ struct event *event, *next_event;
mutex_lock(&client->device->client_list_mutex);
list_del(&client->link);
@@ -1423,8 +1444,8 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
idr_remove_all(&client->resource_idr);
idr_destroy(&client->resource_idr);
- list_for_each_entry_safe(e, next_e, &client->event_list, link)
- kfree(e);
+ list_for_each_entry_safe(event, next_event, &client->event_list, link)
+ kfree(event);
client_put(client);