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ESP SCSI commands are already accumulated in cmdbuf and so there is no need to keep a separate pdma_buf buffer. Accumulate SCSI commands for PDMA transfers in cmdbuf instead of pdma_buf so update cmdlen accordingly and change pdma_origin for PDMA transfers to CMD which allows the PDMA origin to be removed. This commit also removes a stray memcpy() from get_cmd() which is a no-op because cmdlen is always zero at the start of a command. Notionally the removal of pdma_buf from vmstate_esp_pdma also breaks migration compatibility for the PDMA subsection until its complete removal by the end of the series. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20210304221103.6369-19-mark.cave-ayland@ilande.co.uk>