In rocker_dma_test_offset(), "buf" is mapped to streaming DMA on line 203:
dma_handle = pci_map_single(..., buf, ...);
Then, "buf" is accessed on line 229:
expect[i] = ~buf[i];
This access 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