mirror of https://gitee.com/openkylin/linux.git
net: axienet: Fix casting of pointers to u32
This driver was casting skb pointers to u32 and storing them as such in the DMA buffer descriptor, which is obviously broken on 64-bit. The area of the buffer descriptor being used is not accessed by the hardware and has sufficient room for a 32 or 64-bit pointer, so just store the skb pointer as such. Signed-off-by: Robert Hancock <hancock@sedsystems.ca> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -356,9 +356,6 @@
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* @app2: MM2S/S2MM User Application Field 2.
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* @app3: MM2S/S2MM User Application Field 3.
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* @app4: MM2S/S2MM User Application Field 4.
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* @sw_id_offset: MM2S/S2MM Sw ID
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* @reserved5: Reserved and not used
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* @reserved6: Reserved and not used
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*/
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struct axidma_bd {
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u32 next; /* Physical address of next buffer descriptor */
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@ -373,11 +370,9 @@ struct axidma_bd {
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u32 app1; /* TX start << 16 | insert */
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u32 app2; /* TX csum seed */
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u32 app3;
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u32 app4;
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u32 sw_id_offset;
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u32 reserved5;
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u32 reserved6;
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};
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u32 app4; /* Last field used by HW */
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struct sk_buff *skb;
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} __aligned(XAXIDMA_BD_MINIMUM_ALIGNMENT);
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/**
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* struct axienet_local - axienet private per device data
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@ -159,8 +159,7 @@ static void axienet_dma_bd_release(struct net_device *ndev)
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for (i = 0; i < RX_BD_NUM; i++) {
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dma_unmap_single(ndev->dev.parent, lp->rx_bd_v[i].phys,
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lp->max_frm_size, DMA_FROM_DEVICE);
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dev_kfree_skb((struct sk_buff *)
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(lp->rx_bd_v[i].sw_id_offset));
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dev_kfree_skb(lp->rx_bd_v[i].skb);
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}
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if (lp->rx_bd_v) {
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@ -227,7 +226,7 @@ static int axienet_dma_bd_init(struct net_device *ndev)
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if (!skb)
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goto out;
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lp->rx_bd_v[i].sw_id_offset = (u32) skb;
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lp->rx_bd_v[i].skb = skb;
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lp->rx_bd_v[i].phys = dma_map_single(ndev->dev.parent,
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skb->data,
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lp->max_frm_size,
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@ -595,14 +594,15 @@ static void axienet_start_xmit_done(struct net_device *ndev)
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dma_unmap_single(ndev->dev.parent, cur_p->phys,
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(cur_p->cntrl & XAXIDMA_BD_CTRL_LENGTH_MASK),
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DMA_TO_DEVICE);
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if (cur_p->app4)
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dev_consume_skb_irq((struct sk_buff *)cur_p->app4);
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if (cur_p->skb)
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dev_consume_skb_irq(cur_p->skb);
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/*cur_p->phys = 0;*/
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cur_p->app0 = 0;
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cur_p->app1 = 0;
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cur_p->app2 = 0;
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cur_p->app4 = 0;
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cur_p->status = 0;
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cur_p->skb = NULL;
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size += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
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packets++;
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@ -707,7 +707,7 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
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}
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cur_p->cntrl |= XAXIDMA_BD_CTRL_TXEOF_MASK;
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cur_p->app4 = (unsigned long)skb;
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cur_p->skb = skb;
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tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
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/* Start the transfer */
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@ -742,13 +742,15 @@ static void axienet_recv(struct net_device *ndev)
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while ((cur_p->status & XAXIDMA_BD_STS_COMPLETE_MASK)) {
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tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
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skb = (struct sk_buff *) (cur_p->sw_id_offset);
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length = cur_p->app4 & 0x0000FFFF;
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dma_unmap_single(ndev->dev.parent, cur_p->phys,
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lp->max_frm_size,
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DMA_FROM_DEVICE);
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skb = cur_p->skb;
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cur_p->skb = NULL;
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length = cur_p->app4 & 0x0000FFFF;
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skb_put(skb, length);
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skb->protocol = eth_type_trans(skb, ndev);
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/*skb_checksum_none_assert(skb);*/
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@ -783,7 +785,7 @@ static void axienet_recv(struct net_device *ndev)
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DMA_FROM_DEVICE);
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cur_p->cntrl = lp->max_frm_size;
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cur_p->status = 0;
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cur_p->sw_id_offset = (u32) new_skb;
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cur_p->skb = new_skb;
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++lp->rx_bd_ci;
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lp->rx_bd_ci %= RX_BD_NUM;
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@ -1343,8 +1345,8 @@ static void axienet_dma_err_handler(unsigned long data)
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(cur_p->cntrl &
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XAXIDMA_BD_CTRL_LENGTH_MASK),
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DMA_TO_DEVICE);
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if (cur_p->app4)
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dev_kfree_skb_irq((struct sk_buff *) cur_p->app4);
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if (cur_p->skb)
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dev_kfree_skb_irq(cur_p->skb);
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cur_p->phys = 0;
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cur_p->cntrl = 0;
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cur_p->status = 0;
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@ -1353,7 +1355,7 @@ static void axienet_dma_err_handler(unsigned long data)
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cur_p->app2 = 0;
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cur_p->app3 = 0;
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cur_p->app4 = 0;
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cur_p->sw_id_offset = 0;
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cur_p->skb = NULL;
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}
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for (i = 0; i < RX_BD_NUM; i++) {
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