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From:   Krzysztof Kozlowski <krzk@kernel.org>
To:     Vinod Koul <vkoul@kernel.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Robin Gong <yibin.gong@nxp.com>, Peng Ma <peng.ma@nxp.com>,
        Fabio Estevam <festevam@gmail.com>, dmaengine@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Krzysztof Kozlowski <krzk@kernel.org>
Subject: [PATCH 1/2] dmaengine: fsl-edma: Add lockdep assert for exported function
Date:   Thu, 11 Jun 2020 14:17:40 +0200
Message-Id: <1591877861-28156-1-git-send-email-krzk@kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Add lockdep assert for an exported function expected to be called under
spin lock.  Since this function is called in different modules, the
lockdep assert will be self-documenting note about need for locking.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 drivers/dma/fsl-edma-common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index 5697c3622699..4550818cca4a 100644
--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -589,6 +589,8 @@ void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
 {
 	struct virt_dma_desc *vdesc;
 
+	lockdep_assert_held(&fsl_chan->vchan.lock);
+
 	vdesc = vchan_next_desc(&fsl_chan->vchan);
 	if (!vdesc)
 		return;
-- 
2.7.4