iwlagn: fix bug in txq freeing

The iwl_hw_txq_free_tfd() function can be
called from contexts with IRQs disabled,
so it must not call dev_kfree_skb() but
rather dev_kfree_skb_any() instead.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 9c85e1b..a61d567 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -484,8 +484,15 @@ void iwl_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq)
                                iwl_tfd_tb_get_len(tfd, i), PCI_DMA_TODEVICE);
 
                if (txq->txb) {
-                       dev_kfree_skb(txq->txb[txq->q.read_ptr].skb[i - 1]);
-                       txq->txb[txq->q.read_ptr].skb[i - 1] = NULL;
+                       struct sk_buff *skb;
+
+                       skb = txq->txb[txq->q.read_ptr].skb[i - 1];
+
+                       /* can be called from irqs-disabled context */
+                       if (skb) {
+                               dev_kfree_skb_any(skb);
+                               txq->txb[txq->q.read_ptr].skb[i - 1] = NULL;
+                       }
                }
        }
 }