dmaengine: Add safe API to combine configuration and preparation

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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>

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Frank Li 2026-05-21 11:32:48 -04:00 • committed by Vinod Koul

parent 796bdb33e8

commit af900b7dc1

2 changed files with 88 additions and 0 deletions

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drivers/dma/dmaengine.c

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86

include/linux/dmaengine.h

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