This is a note to let you know that I've just added the patch titled
rtlwifi: Add missing DMA buffer unmapping for PCI drivers
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rtlwifi-add-missing-dma-buffer-unmapping-for-pci-drivers.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 673f7786e205c87b5d978c62827b9a66d097bebb Mon Sep 17 00:00:00 2001
From: Larry Finger <[email protected]>
Date: Mon, 26 Mar 2012 10:48:20 -0500
Subject: rtlwifi: Add missing DMA buffer unmapping for PCI drivers
From: Larry Finger <[email protected]>
commit 673f7786e205c87b5d978c62827b9a66d097bebb upstream.
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]>
Signed-off-by: John W. Linville <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/wireless/rtlwifi/pci.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/net/wireless/rtlwifi/pci.c
+++ b/drivers/net/wireless/rtlwifi/pci.c
@@ -954,8 +954,13 @@ static void _rtl_pci_prepare_bcn_tasklet
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);
Patches currently in stable-queue which might be from [email protected]
are
queue-3.0/rtlwifi-add-missing-dma-buffer-unmapping-for-pci-drivers.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
