Re: [PATCH] net: vmxnet3: avoid accessing the data mapped to streaming DMA

From: David Miller
Date: Mon Aug 03 2020 - 18:59:53 EST

From: Jia-Ju Bai <baijiaju@xxxxxxxxxxxxxxx>
Date: Sun, 2 Aug 2020 21:11:07 +0800

> In vmxnet3_probe_device(), "adapter" is mapped to streaming DMA:
> adapter->adapter_pa = dma_map_single(..., adapter, ...);
> Then "adapter" is accessed at many places in this function.
> Theses accesses may cause data inconsistency between CPU cache and
> hardware.
> To fix this problem, dma_map_single() is called after these accesses.
> Signed-off-by: Jia-Ju Bai <baijiaju@xxxxxxxxxxxxxxx>

'adapter' is accessed everywhere, in the entire driver, not just here
in the probe function.