diff options
Diffstat (limited to 'net/wireless/core.h')
| -rw-r--r-- | net/wireless/core.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/net/wireless/core.h b/net/wireless/core.h index 158db1edb92a..eb0f846b40df 100644 --- a/net/wireless/core.h +++ b/net/wireless/core.h @@ -43,7 +43,39 @@ struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy) extern struct mutex cfg80211_drv_mutex; extern struct list_head cfg80211_drv_list; +/* + * This function returns a pointer to the driver + * that the genl_info item that is passed refers to. + * If successful, it returns non-NULL and also locks + * the driver's mutex! + * + * This means that you need to call cfg80211_put_dev() + * before being allowed to acquire &cfg80211_drv_mutex! + * + * This is necessary because we need to lock the global + * mutex to get an item off the list safely, and then + * we lock the drv mutex so it doesn't go away under us. + * + * We don't want to keep cfg80211_drv_mutex locked + * for all the time in order to allow requests on + * other interfaces to go through at the same time. + * + * The result of this can be a PTR_ERR and hence must + * be checked with IS_ERR() for errors. + */ +extern struct cfg80211_registered_device * +cfg80211_get_dev_from_info(struct genl_info *info); + +/* identical to cfg80211_get_dev_from_info but only operate on ifindex */ +extern struct cfg80211_registered_device * +cfg80211_get_dev_from_ifindex(int ifindex); + +extern void cfg80211_put_dev(struct cfg80211_registered_device *drv); + /* free object */ extern void cfg80211_dev_free(struct cfg80211_registered_device *drv); +extern int cfg80211_dev_rename(struct cfg80211_registered_device *drv, + char *newname); + #endif /* __NET_WIRELESS_CORE_H */ |