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Subject[PATCH v3 58/59] dmaengine: Add a warning for drivers not using the generic slave caps retrieval
Date
For the slave caps retrieval to be really useful, most drivers need to
implement it.

Hence, we need to be slightly more aggressive, and trigger a warning at
registration time for drivers that don't fill their caps infos in order to
encourage them to implement it.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
drivers/dma/dmaengine.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 98e9431f85ec..4e18981b16bd 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -827,6 +827,9 @@ int dma_async_device_register(struct dma_device *device)
BUG_ON(!device->device_issue_pending);
BUG_ON(!device->dev);

+ WARN(dma_has_cap(DMA_SLAVE, device->cap_mask) && !device->generic_slave_caps,
+ "this driver doesn't support generic slave capabilities reporting\n");
+
/* note: this only matters in the
* CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH=n case
*/
--
2.1.1


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