[BUG] crypto: qat: accessing the data mapped to streaming DMA

* [BUG] crypto: qat: accessing the data mapped to streaming DMA
@ 2020-08-02 14:35 Jia-Ju Bai
  0 siblings, 0 replies; only message in thread
From: Jia-Ju Bai @ 2020-08-02 14:35 UTC (permalink / raw)
  To: giovanni.cabiddu, herbert, davem, ardb, horia.geanta,
	geert+renesas, ebiggers
  Cc: qat-linux, linux-crypto, linux-kernel

In qat_alg_sgl_to_bufl(), "bufl" and "buflout" are mapped to streaming DMA:
   blp = dma_map_single(dev, bufl, sz, DMA_TO_DEVICE);
   bloutp = dma_map_single(dev, buflout, sz_out, DMA_TO_DEVICE);

Then "bufl" and "buflout" are accessed at some places, such as:
   bufl->bufers[y].len = sg->length;
   bufl->num_bufs = sg_nctr;
   bufers = buflout->bufers;
   buflout->num_bufs = sg_nctr;

These accesses may cause data inconsistency between CPU cache and hardware.

I am not sure how to properly fix this problem, and thus I only report it.

Best wishes,
Jia-Ju Bai

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