iwlwifi: mvm: sanity check context in iwl_mvm_phy_ctxt_unref()
In some botched (!) restart scenarios we seem to get here with
a NULL PHY context, so warn and exit instead of crashing.
Reported-by: Omer Kremer <omerx.kremer@intel.com>
Reviewed-by: Ilan Peer <ilan.peer@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c b/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c
index 0ea61aa..1b4db25 100644
--- a/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c
+++ b/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c
@@ -245,5 +245,9 @@
void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
{
lockdep_assert_held(&mvm->mutex);
+
+ if (WARN_ON_ONCE(!ctxt))
+ return;
+
ctxt->ref--;
}