Re: [PATCH] USB: usblp: fix DMA to stack

On Mon, Jan 04, 2021 at 03:59:02PM +0100, Greg Kroah-Hartman wrote:

On Mon, Jan 04, 2021 at 03:53:02PM +0100, Johan Hovold wrote:

quoted

Stack-allocated buffers cannot be used for DMA (on all architectures).

Replace the HP-channel macro with a helper function that allocates a
dedicated transfer buffer so that it can continue to be used with
arguments from the stack.

Wow, no one uses this driver anymore it seems, this should have
triggered a runtime warning on newer kernels :(

This helper is only used by the IOCNR_HP_SET_CHANNEL ioctl so perhaps
it's just that one which isn't used much.

Johan