[036/165] iwlwifi: fix bugs in change_interface

From: Greg KH
Date: Wed Jun 01 2011 - 04:18:28 EST


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

------------------
Content-Length: 1334
Lines: 46

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
@@ -1783,6 +1783,15 @@ 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))) {
@@ -1810,6 +1819,7 @@ 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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