[CELL] spufs: fix read and write for decr_status file
The decr_status in the LSCSA is valid only in the sequence of context restore. Thus, it's nonsense to read and/or write it through spufs. This patch changes decr_status node to access MFC_CNTL[Ds] in the CSA. Signed-off-by: NMasato Noguchi <Masato.Noguchi@jp.sony.com> Signed-off-by: NJeremy Kerr <jk@ozlabs.org> Signed-off-by: NArnd Bergmann <arnd.bergmann@de.ibm.com>
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