linux-kernel - [PATCH 2/4] dmaengine: stm32-dma: clean channel configuration when channel is freed

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Message-ID: <20201120143320.30367-3-amelie.delaunay@st.com>
Date:   Fri, 20 Nov 2020 15:33:18 +0100
From:   Amelie Delaunay <amelie.delaunay@...com>
To:     Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>
CC:     <dmaengine@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Amelie Delaunay <amelie.delaunay@...com>,
        Pierre-Yves MORDRET <pierre-yves.mordret@...com>
Subject: [PATCH 2/4] dmaengine: stm32-dma: clean channel configuration when channel is freed

When dma_channel_release is called, it means that the channel won't be used
anymore with the configuration it had. To ensure a future client can safely
use the channel after it has been released, clean the configuration done
when channel was requested.

Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
---
 drivers/dma/stm32-dma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index 55a6bd381219..62501e5d9e9d 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -1220,6 +1220,8 @@ static void stm32_dma_free_chan_resources(struct dma_chan *c)
 	pm_runtime_put(dmadev->ddev.dev);
 
 	vchan_free_chan_resources(to_virt_chan(c));
+	stm32_dma_clear_reg(&chan->chan_reg);
+	chan->threshold = 0;
 }
 
 static void stm32_dma_desc_free(struct virt_dma_desc *vdesc)
-- 
2.17.1