On 05/24/2012 11:56 AM, [email protected] wrote:
The patch below does not apply to the 3.3-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to<[email protected]>.
thanks,
greg k-h
This patch is already in the 3.3-stable tree.
Larry
------------------ original commit in Linus's tree ------------------
From a75e2ad772b6c26efd702f04be1f9a6414d24f22 Mon Sep 17 00:00:00 2001
From: Larry Finger<[email protected]>
Date: Mon, 26 Mar 2012 10:48:20 -0500
Subject: [PATCH] rtlwifi: Add missing DMA buffer unmapping for PCI drivers
In https://bugzilla.kernel.org/show_bug.cgi?id=42976, a system with driver
rtl8192se used as an AP suffers from "Out of SW-IOMMU space" errors. These
are caused by the DMA buffers used for beacons never being unmapped.
This bug was also reported at
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/961618
Reported-and-Tested-by: Da Xue<[email protected]>
Signed-off-by: Larry Finger<[email protected]>
Cc: Stable<[email protected]>
Signed-off-by: John W. Linville<[email protected]>
diff --git a/drivers/net/wireless/rtlwifi/pci.c
b/drivers/net/wireless/rtlwifi/pci.c
index 07dd38e..288b035 100644
--- a/drivers/net/wireless/rtlwifi/pci.c
+++ b/drivers/net/wireless/rtlwifi/pci.c
@@ -912,8 +912,13 @@ static void _rtl_pci_prepare_bcn_tasklet(struct
ieee80211_hw *hw)
memset(&tcb_desc, 0, sizeof(struct rtl_tcb_desc));
ring =&rtlpci->tx_ring[BEACON_QUEUE];
pskb = __skb_dequeue(&ring->queue);
- if (pskb)
+ if (pskb) {
+ struct rtl_tx_desc *entry =&ring->desc[ring->idx];
+ pci_unmap_single(rtlpci->pdev, rtlpriv->cfg->ops->get_desc(
+ (u8 *) entry, true, HW_DESC_TXBUFF_ADDR),
+ pskb->len, PCI_DMA_TODEVICE);
kfree_skb(pskb);
+ }
/*NB: the beacon data buffer must be 32-bit aligned. */
pskb = ieee80211_beacon_get(hw, mac->vif);
--
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