[patch 28/87] cfg80211: fix race between core hint and drivers custom apply

[Greg KH]

2.6.29-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx>

commit 5078b2e32ad4b1f753b1c837c15892202f753c97 upstream.

Its possible for cfg80211 to have scheduled the work and for
the global workqueue to not have kicked in prior to a cfg80211
driver's regulatory hint or wiphy_apply_custom_regulatory().

Although this is very unlikely its possible and should fix
this race. When this race would happen you are expected to have
hit a null pointer dereference panic.

Signed-off-by: Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx>
Tested-by: Alan Jenkins <alan-jenkins@xxxxxxxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 net/wireless/reg.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1497,6 +1497,13 @@ int regulatory_init(void)
 		       "using static definition\n");
 #endif
 
+	/*
+	 * This ensures last_request is populated once modules
+	 * come swinging in and calling regulatory hints and
+	 * wiphy_apply_custom_regulatory().
+	 */
+	flush_scheduled_work();
+
 	return 0;
 }
 


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/