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| author | Daniel Lichtenberger <daniel.lichtenberger@gmail.com> | 2010-10-28 23:20:12 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-11-09 14:05:23 -0800 |
| commit | 43f88d530ec656d9b556fb0d127b30757b1c3d35 (patch) | |
| tree | ba8eb4e133fff45d25299f345223570409f2b6d4 | |
| parent | eacd121c3d0b74220aa6a91223e0adf7d5ec2497 (diff) | |
| download | linux-43f88d530ec656d9b556fb0d127b30757b1c3d35.tar.gz linux-43f88d530ec656d9b556fb0d127b30757b1c3d35.tar.bz2 linux-43f88d530ec656d9b556fb0d127b30757b1c3d35.zip | |
Staging: rtl8192e: fix IOMMU memory leak
Unmap the rx buffer before mapping the new one in rtl8192_rx.
Failing to do so quickly exhausts the IOMMU memory during downloads:
[...] DMA: Out of SW-IOMMU space for 9100 bytes at device ...
Using "iommu=off mem=4g" also fixes the problem because
then pci_map_single does not allocate memory.
Tested on my personal laptop with a RTL8192E device. Without this
patch the kernel quickly runs out of IOMMU memory (downloading 5 MB
of data is sufficient to trigger it), with this patch applied
I haven't experienced any issues so far.
Signed-off-by: Daniel Lichtenberger <daniel.lichtenberger@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/staging/rtl8192e/r8192E_core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/staging/rtl8192e/r8192E_core.c b/drivers/staging/rtl8192e/r8192E_core.c index a202194b5cbb..b1786dcac245 100644 --- a/drivers/staging/rtl8192e/r8192E_core.c +++ b/drivers/staging/rtl8192e/r8192E_core.c @@ -5829,6 +5829,9 @@ static void rtl8192_rx(struct net_device *dev) } } + pci_unmap_single(priv->pdev, *((dma_addr_t *) skb->cb), + priv->rxbuffersize, PCI_DMA_FROMDEVICE); + skb = new_skb; priv->rx_buf[priv->rx_idx] = skb; *((dma_addr_t *) skb->cb) = pci_map_single(priv->pdev, skb_tail_pointer(skb), priv->rxbuffersize, PCI_DMA_FROMDEVICE); |