[034/146] iwlwifi: fix bugs in change_interface

[Greg KH]

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

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

From: Johannes Berg <johannes.berg@xxxxxxxxx>

commit a2b76b3b31568da9d281a393845f17689594ccdf upstream.

If change_interface gets invoked during a firmware
restart, it may crash; prevent that from happening
by checking if ctx->vif is assigned.

Additionally, in my initial commit I forgot to set
the vif->p2p variable correctly, so fix that too.

Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/wireless/iwlwifi/iwl-core.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -1879,6 +1879,15 @@ int iwl_mac_change_interface(struct ieee
 
 	mutex_lock(&priv->mutex);
 
+	if (!ctx->vif || !iwl_is_ready_rf(priv)) {
+		/*
+		 * Huh? But wait ... this can maybe happen when
+		 * we're in the middle of a firmware restart!
+		 */
+		err = -EBUSY;
+		goto out;
+	}
+
 	interface_modes = ctx->interface_modes | ctx->exclusive_interface_modes;
 
 	if (!(interface_modes & BIT(newtype))) {
@@ -1906,6 +1915,7 @@ int iwl_mac_change_interface(struct ieee
 	/* success */
 	iwl_teardown_interface(priv, vif, true);
 	vif->type = newtype;
+	vif->p2p = newp2p;
 	err = iwl_setup_interface(priv, ctx);
 	WARN_ON(err);
 	/*


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