diff options
| author | Larry Finger <Larry.Finger@lwfinger.net> | 2012-03-26 19:48:20 +0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2012-04-11 23:01:45 +0400 |
| commit | 673f7786e205c87b5d978c62827b9a66d097bebb (patch) | |
| tree | 4ecbf9e03f1b150f3b91be22ffaaac37dae34c4b /drivers/net/wireless | |
| parent | a7959c1394d4126a70a53b914ce4105f5173d0aa (diff) | |
| download | linux-673f7786e205c87b5d978c62827b9a66d097bebb.tar.xz | |
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 <da@lessconfused.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless')
| -rw-r--r-- | drivers/net/wireless/rtlwifi/pci.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/wireless/rtlwifi/pci.c b/drivers/net/wireless/rtlwifi/pci.c index 07dd38efe62a..288b035a3579 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); |