[PATCH] iwlagn: check for !priv->txq in iwlagn_wait_tx_queue_empty

If the interface is down, txq is NULL. iwlagn_wait_tx_queue_empty
needs to check for this case to avoid dereferencing that pointer.

Signed-off-by: Keith Packard <keithp@keithp.com>
---

This is on top of v3.0

 drivers/net/wireless/iwlwifi/iwl-agn-lib.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
index f803fb6..d6ae444 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c

@@ -1487,6 +1487,9 @@ int iwlagn_wait_tx_queue_empty(struct iwl_priv *priv)
 	unsigned long now = jiffies;
 	int ret = 0;
 
+	if (!priv->txq)
+		return 0;
+
 	/* waiting for all the tx frames complete might take a while */
 	for (cnt = 0; cnt < priv->hw_params.max_txq_num; cnt++) {
 		if (cnt == priv->cmd_queue)

-- 
1.7.5.4