[BUG] crypto: qat: accessing the data mapped to streaming DMA
From: Jia-Ju Bai
Date: Sun Aug 02 2020 - 10:37:24 EST
In qat_alg_sgl_to_bufl(), "bufl" and "buflout" are mapped to streaming DMA:
Â blp = dma_map_single(dev, bufl, sz, DMA_TO_DEVICE);
Â bloutp = dma_map_single(dev, buflout, sz_out, DMA_TO_DEVICE);
Then "bufl" and "buflout" are accessed at some places, such as:
Â bufl->bufers[y].len = sg->length;
Â bufl->num_bufs = sg_nctr;
Â bufers = buflout->bufers;
Â 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.