libertas: remove internal buffers from GSPI driver
This patch removes the internal command and data buffers that the GSPI driver maintained and instead relies on the Libertas core to synchronize access to the command and data ports as with the other interface drivers. This cleanup reduces the GSPI driver's memory footprint and should improve performance by removing the need to copy to these internal buffers. This also simplifies the bottom half of the interrupt handler. This is an incremental cleanup: after removing the redundant buffers, we can further improve the driver to use a threaded IRQ handler instead of maintaining its own thread. However I would like a few folks to test the buffer removal first and make sure that I'm not introducing regressions. Tested on Blackfin BF527 with DMA disabled due to an issue with the SPI host controller driver in the current bleeding-edge Blackfin kernel. I would appreciate it if someone with working DMA could test this patch and provide feedback. Signed-off-by: NAndrey Yurovsky <andrey@cozybit.com> Tested-by: NGeorge Shore <george.shore@imgtec.com> Acked-by: NDan Williams <dcbw@redhat.com> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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