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Subject[PATCH] Fix IXP4xx coherent allocations
Date
ARM core code currently requires coherent DMA mask to be set. Make sure
we limit PCI devices to 64 MiB while allowing on-chip devices to access
the whole 4 GiB address space.

This fixes a v3.7+ regression which broke IXP4xx built-in network devices.

Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>
Cc: <stable@vger.kernel.org>

diff --git a/arch/arm/mach-ixp4xx/common-pci.c b/arch/arm/mach-ixp4xx/common-pci.c
index ea1933d..8629fc9 100644
--- a/arch/arm/mach-ixp4xx/common-pci.c
+++ b/arch/arm/mach-ixp4xx/common-pci.c
@@ -454,10 +454,15 @@ int ixp4xx_setup(int nr, struct pci_sys_data *sys)

int dma_set_coherent_mask(struct device *dev, u64 mask)
{
- if (mask >= SZ_64M - 1)
- return 0;
+ if ((mask & DMA_BIT_MASK(26)) != DMA_BIT_MASK(26))
+ return -EIO;
+
+ /* PCI devices are limited to 64 MiB */
+ if (dev_is_pci(dev))
+ mask &= DMA_BIT_MASK(26); /* Use DMA region */

- return -EIO;
+ dev->coherent_dma_mask = mask;
+ return 0;
}

EXPORT_SYMBOL(ixp4xx_pci_read);
diff --git a/drivers/net/ethernet/xscale/ixp4xx_eth.c b/drivers/net/ethernet/xscale/ixp4xx_eth.c
index 6958a5e..7c08269 100644
--- a/drivers/net/ethernet/xscale/ixp4xx_eth.c
+++ b/drivers/net/ethernet/xscale/ixp4xx_eth.c
@@ -1423,7 +1423,7 @@ static int eth_init_one(struct platform_device *pdev)
dev->netdev_ops = &ixp4xx_netdev_ops;
dev->ethtool_ops = &ixp4xx_ethtool_ops;
dev->tx_queue_len = 100;
-
+ dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32));
netif_napi_add(dev, &port->napi, eth_poll, NAPI_WEIGHT);

if (!(port->npe = npe_request(NPE_ID(port->id)))) {
diff --git a/drivers/net/wan/ixp4xx_hss.c b/drivers/net/wan/ixp4xx_hss.c
index 95d0451..83b4597 100644
--- a/drivers/net/wan/ixp4xx_hss.c
+++ b/drivers/net/wan/ixp4xx_hss.c
@@ -1367,6 +1367,7 @@ static int hss_init_one(struct platform_device *pdev)
port->id = pdev->id;
port->dev = &pdev->dev;
port->plat = pdev->dev.platform_data;
+ dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32));
netif_napi_add(dev, &port->napi, hss_hdlc_poll, NAPI_WEIGHT);

if ((err = register_hdlc_device(dev)))
--
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