On Fri, 17 Apr 2020 10:47:33 +0200, "s.achterop@xxxxxx" said: > I found a working solution. I actually don't know what I am doing but it works. > Before the call to dma_zalloc_coherent I added: > > pdev->dev.coherent_dma_mask = 0xffffffff; DMA_BIT_MASK(32) rather than a hex constant would be a better choice. > > Now it works. Note that "works" and "is correct" are two different things. That should be a mask that tells how many bits of the value are actually used by the hardware. On most 32-bit systems, 32 will be correct, but there's other values in use (on S/390, it's either 31 or 64 bits, the PowerPC can have 44, and the old PNP stuff on x86 weirds out at the 24-bit line).
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