dmaengine: Add reference counting to dma_device struct

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Adding a reference count helps drivers to properly implement the unbind
while in use case.

References are taken and put every time a channel is allocated or freed.

Once the final reference is put, the device is removed from the
dma_device_list and a release callback function is called to signal
the driver to free the memory.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Link: https://lore.kernel.org/r/20191216190120.21374-5-logang@deltatee.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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Logan Gunthorpe 2019-12-16 12:01:19 -07:00 • committed by Vinod Koul

parent 11a0fd2b3b

commit 8ad342a863

2 changed files with 56 additions and 9 deletions

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57

drivers/dma/dmaengine.c

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8

include/linux/dmaengine.h

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