atm: eni: avoid accessing the data mapped to streaming DMA

[mirror_ubuntu-jammy-kernel.git] / drivers / atm / eni.c

diff --git a/drivers/atm/eni.c b/drivers/atm/eni.c
index b3d8e00e76716ceadf15859cf51afc400c6c3c0b..39be444534d03aaa6bee4b9140fa61140d56b427 100644 (file)
--- a/drivers/atm/eni.c
+++ b/drivers/atm/eni.c
@@ -1034,6 +1034,7 @@ static enum enq_res do_tx(struct sk_buff *skb)
        u32 dma_rd,dma_wr;
        u32 size; /* in words */
        int aal5,dma_size,i,j;
+       unsigned char skb_data3;
 
        DPRINTK(">do_tx\n");
        NULLCHECK(skb);
@@ -1108,6 +1109,7 @@ DPRINTK("iovcnt = %d\n",skb_shinfo(skb)->nr_frags);
                    vcc->dev->number);
                return enq_jam;
        }
+       skb_data3 = skb->data[3];
        paddr = dma_map_single(&eni_dev->pci_dev->dev,skb->data,skb->len,
                               DMA_TO_DEVICE);
        ENI_PRV_PADDR(skb) = paddr;
@@ -1150,7 +1152,7 @@ DPRINTK("doing direct send\n"); /* @@@ well, this doesn't work anyway */
            (size/(ATM_CELL_PAYLOAD/4)),tx->send+tx->tx_pos*4);
 /*printk("dsc = 0x%08lx\n",(unsigned long) readl(tx->send+tx->tx_pos*4));*/
        writel((vcc->vci << MID_SEG_VCI_SHIFT) |
-            (aal5 ? 0 : (skb->data[3] & 0xf)) |
+            (aal5 ? 0 : (skb_data3 & 0xf)) |
            (ATM_SKB(skb)->atm_options & ATM_ATMOPT_CLP ? MID_SEG_CLP : 0),
            tx->send+((tx->tx_pos+1) & (tx->words-1))*4);
        DPRINTK("size: %d, len:%d\n",size,skb->len);