VisionFive2 Linux kernel

author: Jia-Ju Bai <baijiaju@tsinghua.edu.cn> 2020-08-02 17:33:40 +0800 committer: David S. Miller <davem@davemloft.net> 2020-08-03 15:51:25 -0700 commit: cbbb64f62acd97429f517bd382ada9d618c8856a parent: a45a9e8a768c32103ffec67f9b173968a6154a11

Commit Summary:

atm: idt77252: avoid accessing the data mapped to streaming DMA

Diffstat:

1 file changed, 5 insertions, 4 deletions

diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c
index df51680e8931..65a3886f68c9 100644
--- a/drivers/atm/idt77252.c
+++ b/drivers/atm/idt77252.c
@@ -835,6 +835,7 @@ queue_skb(struct idt77252_dev *card, struct vc_map *vc,
 	unsigned long flags;
 	int error;
 	int aal;
+	u32 word4;
 
 	if (skb->len == 0) {
 		printk("%s: invalid skb->len (%d)\n", card->name, skb->len);
@@ -846,6 +847,8 @@ queue_skb(struct idt77252_dev *card, struct vc_map *vc,
 
 	tbd = &IDT77252_PRV_TBD(skb);
 	vcc = ATM_SKB(skb)->vcc;
+	word4 = (skb->data[0] << 24) | (skb->data[1] << 16) |
+			(skb->data[2] <<  8) | (skb->data[3] <<  0);
 
 	IDT77252_PRV_PADDR(skb) = dma_map_single(&card->pcidev->dev, skb->data,
 						 skb->len, DMA_TO_DEVICE);
@@ -859,8 +862,7 @@ queue_skb(struct idt77252_dev *card, struct vc_map *vc,
 		tbd->word_1 = SAR_TBD_OAM | ATM_CELL_PAYLOAD | SAR_TBD_EPDU;
 		tbd->word_2 = IDT77252_PRV_PADDR(skb) + 4;
 		tbd->word_3 = 0x00000000;
-		tbd->word_4 = (skb->data[0] << 24) | (skb->data[1] << 16) |
-			      (skb->data[2] <<  8) | (skb->data[3] <<  0);
+		tbd->word_4 = word4;
 
 		if (test_bit(VCF_RSV, &vc->flags))
 			vc = card->vcs[0];
@@ -890,8 +892,7 @@ queue_skb(struct idt77252_dev *card, struct vc_map *vc,
 
 		tbd->word_2 = IDT77252_PRV_PADDR(skb) + 4;
 		tbd->word_3 = 0x00000000;
-		tbd->word_4 = (skb->data[0] << 24) | (skb->data[1] << 16) |
-			      (skb->data[2] <<  8) | (skb->data[3] <<  0);
+		tbd->word_4 = word4;
 		break;
 
 	case ATM_AAL5: