rtlwifi: Use order 2 RX buffer allocation only if necessary

Although a previous fix handles the kernel panics that result from
failure to allocate a new RX buffer, memory fragmentation can be
reduced if the amsdu_8k capability is disabled as new buffers need only
be of O(0), not O(2).

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/rtlwifi/pci.c b/drivers/net/wireless/rtlwifi/pci.c
index c2b83a5..89100e7 100644 (file)
--- a/drivers/net/wireless/rtlwifi/pci.c
+++ b/drivers/net/wireless/rtlwifi/pci.c
@@ -1115,6 +1115,13 @@ static int _rtl_pci_init_rx_ring(struct ieee80211_hw *hw)
 
                rtlpci->rx_ring[rx_queue_idx].idx = 0;
 
+               /* If amsdu_8k is disabled, set buffersize to 4096. This
+                * change will reduce memory fragmentation.
+                */
+               if (rtlpci->rxbuffersize > 4096 &&
+                   rtlpriv->rtlhal.disable_amsdu_8k)
+                       rtlpci->rxbuffersize = 4096;
+
                for (i = 0; i < rtlpci->rxringcount; i++) {
                        struct sk_buff *skb =
                            dev_alloc_skb(rtlpci->rxbuffersize);