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Introduce dmaengine_prep_config_single_safe() and dmaengine_prep_config_sg_safe() to provide a reentrant-safe way to combine slave configuration and transfer preparation. Drivers may implement the new device_prep_config_sg() callback to perform both steps atomically. If the callback is not provided, the helpers fall back to calling dmaengine_slave_config() followed by dmaengine_prep_slave_sg() under per-channel spinlock protection. Tested-by: Niklas Cassel <cassel@kernel.org> Signed-off-by: Frank Li <Frank.Li@nxp.com> Link: https://patch.msgid.link/20260521-dma_prep_config-v7-2-1f73f4899883@nxp.com Signed-off-by: Vinod Koul <vkoul@kernel.org>