[PATCH v4 57/58] dmaengine: Add a warning for drivers not using the generic slave caps retrieval
From: Maxime Ripard <hidden>
Date: 2014-10-28 21:34:14
Also in:
lkml
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
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 <redacted> --- drivers/dma/dmaengine.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 98e9431f85ec..300c8cd2786c 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->directions, + "this driver doesn't support generic slave capabilities reporting\n"); + /* note: this only matters in the * CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH=n case */
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2.1.1