iwlwifi: move lockdep assertion into DVM

The fact that the mutex must be held is an
implementation detail of DVM, but something
has to ensure that no two synchronous cmds
are submitted concurrently. Move the lockdep
assertion into the DVM-specific code, but
also make the transport abort if there are
two concurrently commands.

The assertion is much more useful though as
the transport check can only catch it when
it actually happens, while the assertion
makes sure it can't possibly happen.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 16 insertions, 3 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
index 11f24110d3fe..238f824c2f3e 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
@@ -1298,6 +1298,14 @@ int iwl_dvm_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
                 return -EIO;
         }
 
+        /*
+         * Synchronous commands from this op-mode must hold
+         * the mutex, this ensures we don't try to send two
+         * (or more) synchronous commands at a time.
+         */
+        if (cmd->flags & CMD_SYNC)
+                lockdep_assert_held(&priv->shrd->mutex);
+
         return iwl_trans_send_cmd(trans(priv), cmd);
 }
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c
index c85975e63d75..ca4ceeacc989 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c
@@ -973,8 +973,6 @@ static int iwl_send_cmd_sync(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
         int cmd_idx;
         int ret;
 
-        lockdep_assert_held(&trans->shrd->mutex);
-
         IWL_DEBUG_INFO(trans, "Attempting to send sync command %s\n",
                         get_cmd_string(cmd->id));
 
@@ -983,7 +981,14 @@ static int iwl_send_cmd_sync(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
                                get_cmd_string(cmd->id));
                 return -EIO;
         }
-        set_bit(STATUS_HCMD_ACTIVE, &trans->shrd->status);
+
+        if (WARN_ON(test_and_set_bit(STATUS_HCMD_ACTIVE,
+                                     &trans->shrd->status))) {
+                IWL_ERR(trans, "Command %s: a command is already active!\n",
+                        get_cmd_string(cmd->id));
+                return -EIO;
+        }
+
         IWL_DEBUG_INFO(trans, "Setting HCMD_ACTIVE for command %s\n",
                         get_cmd_string(cmd->id));