[PATCH 04/11] mwifiex: Add locking to mwifiex_11n_delba

[Brian Norris]

From: Douglas Anderson <diand...@chromium.org>

The mwifiex_11n_delba() function walked the rx_reorder_tbl_ptr without
holding the lock, which was an obvious violation.

Grab the lock.

NOTE: we hold the lock while calling mwifiex_send_delba().  There's also
several callers in 11n_rxreorder.c that hold the lock and the comments
in the struct sound just like very other list/lock pair -- as if the
lock should definitely be help for all operations like this.

Signed-off-by: Douglas Anderson <diand...@chromium.org>
Signed-off-by: Brian Norris <briannor...@chromium.org>
---
 drivers/net/wireless/marvell/mwifiex/11n.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/11n.c 
b/drivers/net/wireless/marvell/mwifiex/11n.c
index c75b6abf16a0..16c77c27f1b6 100644
--- a/drivers/net/wireless/marvell/mwifiex/11n.c
+++ b/drivers/net/wireless/marvell/mwifiex/11n.c
@@ -653,11 +653,13 @@ int mwifiex_send_delba(struct mwifiex_private *priv, int 
tid, u8 *peer_mac,
 void mwifiex_11n_delba(struct mwifiex_private *priv, int tid)
 {
        struct mwifiex_rx_reorder_tbl *rx_reor_tbl_ptr;
+       unsigned long flags;
 
+       spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
        if (list_empty(&priv->rx_reorder_tbl_ptr)) {
                dev_dbg(priv->adapter->dev,
                        "mwifiex_11n_delba: rx_reorder_tbl_ptr empty\n");
-               return;
+               goto exit;
        }
 
        list_for_each_entry(rx_reor_tbl_ptr, &priv->rx_reorder_tbl_ptr, list) {
@@ -666,9 +668,11 @@ void mwifiex_11n_delba(struct mwifiex_private *priv, int 
tid)
                                "Send delba to tid=%d, %pM\n",
                                tid, rx_reor_tbl_ptr->ta);
                        mwifiex_send_delba(priv, tid, rx_reor_tbl_ptr->ta, 0);
-                       return;
+                       goto exit;
                }
        }
+exit:
+       spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 }
 
 /*
-- 
2.13.0.rc2.291.g57267f2277-goog