From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Wed, 22 Oct 2014 17:44:12 +0200 Subject: [PATCH v3 58/59] dmaengine: Add a warning for drivers not using the generic slave caps retrieval In-Reply-To: <1413992653-21963-1-git-send-email-maxime.ripard@free-electrons.com> References: <1413992653-21963-1-git-send-email-maxime.ripard@free-electrons.com> Message-ID: <1413992653-21963-59-git-send-email-maxime.ripard@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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