From 4bbf4d56583dd52c429d88f43cb614bdbe5deea6 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Tue, 24 Mar 2009 09:35:46 +0100 Subject: cfg80211: fix locking in nl80211_set_wiphy Luis reports that there's a circular locking dependency; this is because cfg80211_dev_rename() will acquire the cfg80211_mutex while the device mutex is held, while this normally is done the other way around. The solution is to open-code the device-getting in nl80211_set_wiphy and require holding the mutex around cfg80211_dev_rename rather than acquiring it within. Also fix a bug -- rtnl locking is expected by drivers so we need to provide it. Reported-by: Luis R. Rodriguez Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/wireless/core.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'net/wireless/core.h') diff --git a/net/wireless/core.h b/net/wireless/core.h index 97a6fd8b2b0..d43daa236ef 100644 --- a/net/wireless/core.h +++ b/net/wireless/core.h @@ -99,6 +99,9 @@ struct cfg80211_internal_bss { struct cfg80211_registered_device *cfg80211_drv_by_wiphy_idx(int wiphy_idx); int get_wiphy_idx(struct wiphy *wiphy); +struct cfg80211_registered_device * +__cfg80211_drv_from_info(struct genl_info *info); + /* * This function returns a pointer to the driver * that the genl_info item that is passed refers to. -- cgit v1.2.3