On Sat, 06 Oct 2012 13:45:47 +0100
Russell King [off-list ref] wrote:

This allows drivers (such as OMAP serial) to allocate and free their
transmit buffers in a sane manner, rather than working around the
buffer allocation provided by serial_core.

I think this just illustrates how broken the serial_core layering is in
that drivers can't treat it as a library but get constrained by it.

Fine for now and actually probably a useful hook to begin removing the
circ buffers for the kernel generic kfifo and other work that needs doing
eventually.

Alan