linux-wandboard

MLK-11891-1 usb: otg-fsm: allocate DMA buffer for host request flag separately

HNP polling need a one byte buffer for usb control transfer via DMA read,
currently using a data field in a structure for DMA buffer may cause cache
incoherent issue, because the cache line for the DMA buffer also contains
other data in this structure, while dma from device is outstanding, the
access on other data in the same cache line will cause we get the old data
before DMA. This patch change the host_request_flag to be a pointer, its
memory will be allocated through kmalloc by controller driver, with this
way, the DMA buffer can be properly aligned and padded.

Signed-off-by: Li Jun <jun.li@freescale.com>