From: Yogesh Ashok Powar <yogeshp@marvell.com>
Date: Mon, 6 Jun 2011 09:23:02 +0000 (+0530)
Subject: mwifiex: adding check for enough space before padding
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fb3c19bc9687d972b83faf366b38ac807eca8f25;p=linux-beck.git

mwifiex: adding check for enough space before padding

All MSDUs, except the last one in an AMSDU, should end up at 4
bytes boundary. There is need to check if enough skb_tailroom
space exists before padding the skb.

Also re-arranging code for better readablity.

Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

diff --git a/drivers/net/wireless/mwifiex/11n_aggr.c b/drivers/net/wireless/mwifiex/11n_aggr.c
index aee3491f61d5..25312e4437f5 100644
--- a/drivers/net/wireless/mwifiex/11n_aggr.c
+++ b/drivers/net/wireless/mwifiex/11n_aggr.c
@@ -185,16 +185,15 @@ mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
 	tx_info_aggr->bss_index = tx_info_src->bss_index;
 	skb_aggr->priority = skb_src->priority;
 
-	while (skb_src && ((skb_headroom(skb_aggr) + skb_src->len
-					+ LLC_SNAP_LEN)
-				<= adapter->tx_buf_size)) {
+	do {
+		/* Check if AMSDU can accommodate this MSDU */
+		if (skb_tailroom(skb_aggr) < (skb_src->len + LLC_SNAP_LEN))
+			break;
 
 		skb_src = skb_dequeue(&pra_list->skb_head);
 
-		if (skb_src) {
-			pra_list->total_pkts_size -= skb_src->len;
-			pra_list->total_pkts--;
-		}
+		pra_list->total_pkts_size -= skb_src->len;
+		pra_list->total_pkts--;
 
 		atomic_dec(&priv->wmm.tx_pkts_queued);
 
@@ -212,8 +211,15 @@ mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
 			return -1;
 		}
 
+		if (skb_tailroom(skb_aggr) < pad) {
+			pad = 0;
+			break;
+		}
+		skb_put(skb_aggr, pad);
+
 		skb_src = skb_peek(&pra_list->skb_head);
-	}
+
+	} while (skb_src);
 
 	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);