[PATCH 6/9] rtlwifi: add short circuit in the receive path

[Joshua Roys <Joshua.Roys@gtri.gatech.edu>]

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>From 78b5e60d9797583172d3e1f755a9f354b5a20759 Mon Sep 17 00:00:00 2001
From: Joshua Roys <Joshua.Roys@gtri.gatech.edu>
Date: Thu, 3 May 2012 00:16:39 -0400
Subject: [PATCH 6/9] rtlwifi: add short circuit in the receive path

Allow things like C2H events without any actual 802.11 data to avoid
the rest of the receive path.

Signed-off-by: Joshua Roys <Joshua.Roys@gtri.gatech.edu>
---
 drivers/net/wireless/rtlwifi/usb.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/rtlwifi/usb.c b/drivers/net/wireless/rtlwifi/usb.c
index 88dbef0..00e90bc 100644
--- a/drivers/net/wireless/rtlwifi/usb.c
+++ b/drivers/net/wireless/rtlwifi/usb.c
@@ -440,7 +440,11 @@ static void _rtl_usb_rx_process_agg(struct ieee80211_hw *hw,
 	};
 
 	skb_pull(skb, RTL_RX_DESC_SIZE);
-	rtlpriv->cfg->ops->query_rx_desc(hw, &stats, &rx_status, rxdesc, skb);
+	if (!rtlpriv->cfg->ops->query_rx_desc(hw, &stats, &rx_status, rxdesc,
+	    skb)) {
+		dev_kfree_skb_any(skb);
+		return;
+	}
 	skb_pull(skb, (stats.rx_drvinfo_size + stats.rx_bufshift));
 	hdr = (struct ieee80211_hdr *)(skb->data);
 	fc = hdr->frame_control;
@@ -483,7 +487,11 @@ static void _rtl_usb_rx_process_noagg(struct ieee80211_hw *hw,
 	};
 
 	skb_pull(skb, RTL_RX_DESC_SIZE);
-	rtlpriv->cfg->ops->query_rx_desc(hw, &stats, &rx_status, rxdesc, skb);
+	if (!rtlpriv->cfg->ops->query_rx_desc(hw, &stats, &rx_status, rxdesc,
+	    skb)) {
+		dev_kfree_skb_any(skb);
+		return;
+	}
 	skb_pull(skb, (stats.rx_drvinfo_size + stats.rx_bufshift));
 	hdr = (struct ieee80211_hdr *)(skb->data);
 	fc = hdr->frame_control;
-- 
1.7.7.6