Messages in this thread | | | Date | Mon, 03 Aug 2020 15:51:38 -0700 (PDT) | Subject | Re: [PATCH] atm: eni: avoid accessing the data mapped to streaming DMA | From | David Miller <> |
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From: Jia-Ju Bai <baijiaju@tsinghua.edu.cn> Date: Sun, 2 Aug 2020 17:16:11 +0800
> In do_tx(), skb->data is mapped to streaming DMA on line 1111: > paddr = dma_map_single(...,skb->data,DMA_TO_DEVICE); > > Then skb->data is accessed on line 1153: > (skb->data[3] & 0xf) > > This access may cause data inconsistency between CPU cache and hardware. > > To fix this problem, skb->data[3] is assigned to a local variable before > DMA mapping, and then the driver accesses this local variable instead of > skb->data[3]. > > Signed-off-by: Jia-Ju Bai <baijiaju@tsinghua.edu.cn>
Applied.
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