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The 1394 OHCI driver allocates a DMA coherent buffer for multi-purposes. The buffer is split into three region for specific purposes; i.e. 1/4 for context descriptors of AR request and response as well as 1/2 for self ID handling. This commit uses managed device resource to maintain the lifetime of buffer. Link: https://lore.kernel.org/r/20230604054451.161076-5-o-takashi@sakamocchi.jp Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>