From: Maxime Ripard Date: Mon, 17 Nov 2014 13:42:53 +0000 (+0100) Subject: dmaengine: Add a warning for drivers not using the generic slave caps retrieval X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ecc19d17868be9c9f8f00ed928791533c420f3e0;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git dmaengine: Add a warning for drivers not using the generic slave caps retrieval 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 Acked-by: Laurent Pinchart Signed-off-by: Vinod Koul --- diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index cae120994d8f..30211f9791b7 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -826,6 +826,9 @@ 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 */