Sending URB control messages from stack was never supported. Yet, on x86,
the stack was usually at a memory region that allows DMA transfer.
So, several drivers got it wrong. On Kernel 4.9, if VMAP_STACK=y, none of
those drivers will work, as the stack won't be on a DMA-able area anymore.
So,
Sending URB control messages from stack was never supported. Yet, on x86,
the stack was usually at a memory region that allows DMA transfer.
So, several drivers got it wrong. On Kernel 4.9, if VMAP_STACK=y, none of
those drivers will work, as the stack won't be on a DMA-able area anymore.
So,
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