@@ -27,6 +27,7 @@
#include <media/tuner.h>
static DEFINE_MUTEX(dvbdev_mutex);
+static LIST_HEAD(dvbdevfops_list);
static int dvbdev_debug;
module_param(dvbdev_debug, int, 0644);
@@ -453,14 +454,15 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
enum dvb_device_type type, int demux_sink_pads)
{
struct dvb_device *dvbdev;
- struct file_operations *dvbdevfops;
+ struct file_operations *dvbdevfops = NULL;
+ struct dvbdevfops_node *node = NULL, *new_node = NULL;
struct device *clsdev;
int minor;
int id, ret;
mutex_lock(&dvbdev_register_lock);
- if ((id = dvbdev_get_free_id (adap, type)) < 0){
+ if ((id = dvbdev_get_free_id (adap, type)) < 0) {
mutex_unlock(&dvbdev_register_lock);
*pdvbdev = NULL;
pr_err("%s: couldn't find free device id\n", __func__);
@@ -468,18 +470,45 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
}
*pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
-
if (!dvbdev){
mutex_unlock(&dvbdev_register_lock);
return -ENOMEM;
}
- dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
+ /*
+ * When a device of the same type is probe()d more than once,
+ * the first allocated fops are used. This prevents memory leaks
+ * that can occur when the same device is probe()d repeatedly.
+ */
+ list_for_each_entry(node, &dvbdevfops_list, list_head) {
+ if (node->fops->owner == adap->module &&
+ node->type == type &&
+ node->template == template) {
+ dvbdevfops = node->fops;
+ break;
+ }
+ }
- if (!dvbdevfops){
- kfree (dvbdev);
- mutex_unlock(&dvbdev_register_lock);
- return -ENOMEM;
+ if (dvbdevfops == NULL) {
+ dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
+ if (!dvbdevfops) {
+ kfree(dvbdev);
+ mutex_unlock(&dvbdev_register_lock);
+ return -ENOMEM;
+ }
+
+ new_node = kzalloc(sizeof(struct dvbdevfops_node), GFP_KERNEL);
+ if (!new_node) {
+ kfree(dvbdevfops);
+ kfree(dvbdev);
+ mutex_unlock(&dvbdev_register_lock);
+ return -ENOMEM;
+ }
+
+ new_node->fops = dvbdevfops;
+ new_node->type = type;
+ new_node->template = template;
+ list_add_tail (&new_node->list_head, &dvbdevfops_list);
}
memcpy(dvbdev, template, sizeof(struct dvb_device));
@@ -490,20 +519,20 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
dvbdev->priv = priv;
dvbdev->fops = dvbdevfops;
init_waitqueue_head (&dvbdev->wait_queue);
-
dvbdevfops->owner = adap->module;
-
list_add_tail (&dvbdev->list_head, &adap->device_list);
-
down_write(&minor_rwsem);
#ifdef CONFIG_DVB_DYNAMIC_MINORS
for (minor = 0; minor < MAX_DVB_MINORS; minor++)
if (dvb_minors[minor] == NULL)
break;
-
if (minor == MAX_DVB_MINORS) {
+ if (new_node) {
+ list_del (&new_node->list_head);
+ kfree(dvbdevfops);
+ kfree(new_node);
+ }
list_del (&dvbdev->list_head);
- kfree(dvbdevfops);
kfree(dvbdev);
up_write(&minor_rwsem);
mutex_unlock(&dvbdev_register_lock);
@@ -512,41 +541,47 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
#else
minor = nums2minor(adap->num, type, id);
#endif
-
dvbdev->minor = minor;
dvb_minors[minor] = dvb_device_get(dvbdev);
up_write(&minor_rwsem);
-
ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
if (ret) {
pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
__func__);
-
+ if (new_node) {
+ list_del (&new_node->list_head);
+ kfree(dvbdevfops);
+ kfree(new_node);
+ }
dvb_media_device_free(dvbdev);
list_del (&dvbdev->list_head);
- kfree(dvbdevfops);
kfree(dvbdev);
mutex_unlock(&dvbdev_register_lock);
return ret;
}
- mutex_unlock(&dvbdev_register_lock);
-
clsdev = device_create(dvb_class, adap->device,
MKDEV(DVB_MAJOR, minor),
dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
if (IS_ERR(clsdev)) {
pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
__func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
+ if (new_node) {
+ list_del (&new_node->list_head);
+ kfree(dvbdevfops);
+ kfree(new_node);
+ }
dvb_media_device_free(dvbdev);
list_del (&dvbdev->list_head);
- kfree(dvbdevfops);
kfree(dvbdev);
+ mutex_unlock(&dvbdev_register_lock);
return PTR_ERR(clsdev);
}
+
dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
adap->num, dnames[type], id, minor, minor);
+ mutex_unlock(&dvbdev_register_lock);
return 0;
}
EXPORT_SYMBOL(dvb_register_device);
@@ -575,7 +610,6 @@ static void dvb_free_device(struct kref *ref)
{
struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
- kfree (dvbdev->fops);
kfree (dvbdev);
}
@@ -1081,9 +1115,17 @@ static int __init init_dvbdev(void)
static void __exit exit_dvbdev(void)
{
+ struct dvbdevfops_node *node, *next;
+
class_destroy(dvb_class);
cdev_del(&dvb_device_cdev);
unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
+
+ list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) {
+ list_del (&node->list_head);
+ kfree(node->fops);
+ kfree(node);
+ }
}
subsys_initcall(init_dvbdev);
@@ -193,6 +193,21 @@ struct dvb_device {
void *priv;
};
+/**
+ * struct dvbdevfops_node - fops nodes registered in dvbdevfops_list
+ *
+ * @fops: Dynamically allocated fops for ->owner registration
+ * @type: type of dvb_device
+ * @template: dvb_device used for registration
+ * @list_head: list_head for dvbdevfops_list
+ */
+struct dvbdevfops_node {
+ struct file_operations *fops;
+ enum dvb_device_type type;
+ const struct dvb_device *template;
+ struct list_head list_head;
+};
+
/**
* dvb_device_get - Increase dvb_device reference
*