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Commit de54bc0f authored by Andi Kleen's avatar Andi Kleen Committed by Stephen Hemminger
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x86_64: Check for bad dma address in b44 1GB DMA workaround 



Needed for interaction with the nommu code in x86-64 which
will return bad_dma_address if the address exceeds dma_mask.

Cc: netdev@vger.kernel.org

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
parent 1ea739a5

drivers/net/b44.c

+18 −10
Original line number Diff line number Diff line
@@ -650,8 +650,10 @@ static int b44_alloc_rx_skb(struct b44 *bp, int src_idx, u32 dest_idx_unmasked) 


	/* Hardware bug work-around, the chip is unable to do PCI DMA

	   to/from anything above 1GB :-( */

	if (mapping + RX_PKT_BUF_SZ > B44_DMA_MASK) {

	if (dma_mapping_error(mapping) ||

		mapping + RX_PKT_BUF_SZ > B44_DMA_MASK) {

		/* Sigh... */

		if (!dma_mapping_error(mapping))

			pci_unmap_single(bp->pdev, mapping, RX_PKT_BUF_SZ,PCI_DMA_FROMDEVICE);

		dev_kfree_skb_any(skb);

		skb = __dev_alloc_skb(RX_PKT_BUF_SZ,GFP_DMA);
@@ -660,7 +662,9 @@ static int b44_alloc_rx_skb(struct b44 *bp, int src_idx, u32 dest_idx_unmasked) 
		mapping = pci_map_single(bp->pdev, skb->data,

					 RX_PKT_BUF_SZ,

					 PCI_DMA_FROMDEVICE);

		if (mapping + RX_PKT_BUF_SZ > B44_DMA_MASK) {

		if (dma_mapping_error(mapping) ||

			mapping + RX_PKT_BUF_SZ > B44_DMA_MASK) {

			if (!dma_mapping_error(mapping))

				pci_unmap_single(bp->pdev, mapping, RX_PKT_BUF_SZ,PCI_DMA_FROMDEVICE);

			dev_kfree_skb_any(skb);

			return -ENOMEM;
@@ -967,8 +971,9 @@ static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev) 
	}



	mapping = pci_map_single(bp->pdev, skb->data, len, PCI_DMA_TODEVICE);

	if (mapping + len > B44_DMA_MASK) {

	if (dma_mapping_error(mapping) || mapping + len > B44_DMA_MASK) {

		/* Chip can't handle DMA to/from >1GB, use bounce buffer */

		if (!dma_mapping_error(mapping))

			pci_unmap_single(bp->pdev, mapping, len, PCI_DMA_TODEVICE);



		bounce_skb = __dev_alloc_skb(TX_PKT_BUF_SZ,
@@ -978,7 +983,8 @@ static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev) 


		mapping = pci_map_single(bp->pdev, bounce_skb->data,

					 len, PCI_DMA_TODEVICE);

		if (mapping + len > B44_DMA_MASK) {

		if (dma_mapping_error(mapping) || mapping + len > B44_DMA_MASK) {

			if (!dma_mapping_error(mapping))

				pci_unmap_single(bp->pdev, mapping,

					 len, PCI_DMA_TODEVICE);

			dev_kfree_skb_any(bounce_skb);
@@ -1203,7 +1209,8 @@ static int b44_alloc_consistent(struct b44 *bp) 
		                             DMA_TABLE_BYTES,

		                             DMA_BIDIRECTIONAL);



		if (rx_ring_dma + size > B44_DMA_MASK) {

		if (dma_mapping_error(rx_ring_dma) ||

			rx_ring_dma + size > B44_DMA_MASK) {

			kfree(rx_ring);

			goto out_err;

		}
@@ -1229,7 +1236,8 @@ static int b44_alloc_consistent(struct b44 *bp) 
		                             DMA_TABLE_BYTES,

		                             DMA_TO_DEVICE);



		if (tx_ring_dma + size > B44_DMA_MASK) {

		if (dma_mapping_error(tx_ring_dma) ||

			tx_ring_dma + size > B44_DMA_MASK) {

			kfree(tx_ring);

			goto out_err;

		}