From: Alan Stern on
On Sat, 17 Apr 2010, Michal Nazarewicz wrote:

> usb_get_configuration() uses a temporary buffer allocated on heap
> to read USB configuration descriptor. The buffer is just nine
> bytes an so it is a waste to allocate it on heap where it can be
> allocated on stack with the rest of local variables. This
> simplifies the code and minimises memory usage.

This is completely wrong. You are not allowed to do DMA to buffers on
the stack; some architectures are not capable of handling it.

Alan Stern

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