diff options
| author | Johannes Berg <johannes@sipsolutions.net> | 2009-11-01 19:25:40 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-11-09 16:22:31 -0800 |
| commit | 958da8f522180518a1f04b65d4eef61eb4ecbe72 (patch) | |
| tree | f260ee0bd363cbdb31d48717416a7415a13ae396 /net | |
| parent | db6ad3e1187477afb4a1fc79bc48f0a8cf916ec3 (diff) | |
mac80211: check interface is down before type change
commit c1f9a764cf47686b1f5a0cf87ada68d90056136a upstream.
For some strange reason the netif_running() check
ended up after the actual type change instead of
before, potentially causing all kinds of problems
if the interface is up while changing the type;
one of the problems manifests itself as a warning:
WARNING: at net/mac80211/iface.c:651 ieee80211_teardown_sdata+0xda/0x1a0 [mac80211]()
Hardware name: Aspire one
Pid: 2596, comm: wpa_supplicant Tainted: G W 2.6.31-10-generic #32-Ubuntu
Call Trace:
[] warn_slowpath_common+0x6d/0xa0
[] warn_slowpath_null+0x15/0x20
[] ieee80211_teardown_sdata+0xda/0x1a0 [mac80211]
[] ieee80211_if_change_type+0x4a/0xc0 [mac80211]
[] ieee80211_change_iface+0x61/0xa0 [mac80211]
[] cfg80211_wext_siwmode+0xc7/0x120 [cfg80211]
[] ioctl_standard_call+0x58/0xf0
(http://www.kerneloops.org/searchweek.php?search=ieee80211_teardown_sdata)
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/cfg.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 3f47276caeb8..88b06485a780 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -87,6 +87,9 @@ static int ieee80211_change_iface(struct wiphy *wiphy, int ifindex, if (!dev) return -ENODEV; + if (netif_running(dev)) + return -EBUSY; + if (!nl80211_type_check(type)) return -EINVAL; @@ -96,9 +99,6 @@ static int ieee80211_change_iface(struct wiphy *wiphy, int ifindex, if (ret) return ret; - if (netif_running(sdata->dev)) - return -EBUSY; - if (ieee80211_vif_is_mesh(&sdata->vif) && params->mesh_id_len) ieee80211_sdata_set_mesh_id(sdata, params->mesh_id_len, |