dmaengine: qcom_hidma: comment platform_driver_register call
[ Upstream commit 4df2a8b0ad634d98a67e540a4e18a60f943e7d9f ] Place a comment in hidma_mgmt_init explaining why success must currently be assumed, due to the cleanup issue that would need to be considered were this module ever to be unloadable or were this platform_driver_register call ever to fail. Acked-By: Vinod Koul <vkoul@kernel.org> Acked-By: Sinan Kaya <okaya@kernel.org> Signed-off-by: Phillip Potter <phil@philpotter.co.uk> Link: https://lore.kernel.org/r/20210503115736.2104747-52-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -398,6 +398,20 @@ static int __init hidma_mgmt_init(void)
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of_node_put(child);
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of_node_put(child);
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}
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}
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#endif
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#endif
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/*
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* We do not check for return value here, as it is assumed that
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* platform_driver_register must not fail. The reason for this is that
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* the (potential) hidma_mgmt_of_populate_channels calls above are not
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* cleaned up if it does fail, and to do this work is quite
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* complicated. In particular, various calls of of_address_to_resource,
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* of_irq_to_resource, platform_device_register_full, of_dma_configure,
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* and of_msi_configure which then call other functions and so on, must
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* be cleaned up - this is not a trivial exercise.
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*
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* Currently, this module is not intended to be unloaded, and there is
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* no module_exit function defined which does the needed cleanup. For
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* this reason, we have to assume success here.
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*/
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platform_driver_register(&hidma_mgmt_driver);
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platform_driver_register(&hidma_mgmt_driver);
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return 0;
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return 0;
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