linux-kernel - [PATCH 3.16 248/305] dmaengine: at

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Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Richard Genoud" <richard.genoud@...il.com>,
        "Vinod Koul" <vkoul@...nel.org>,
        "Ludovic Desroches" <ludovic.desroches@...rochip.com>
Subject: [PATCH 3.16 248/305] dmaengine: at_hdmac: fix module unloading

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Genoud <richard.genoud@...il.com>

commit 77e75fda94d2ebb86aa9d35fb1860f6395bf95de upstream.

of_dma_controller_free() was not called on module onloading.
This lead to a soft lockup:
watchdog: BUG: soft lockup - CPU#0 stuck for 23s!
Modules linked in: at_hdmac [last unloaded: at_hdmac]
when of_dma_request_slave_channel() tried to call ofdma->of_dma_xlate().

Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding")
Acked-by: Ludovic Desroches <ludovic.desroches@...rochip.com>
Signed-off-by: Richard Genoud <richard.genoud@...il.com>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/dma/at_hdmac.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -1564,6 +1564,8 @@ static int at_dma_remove(struct platform
 	struct resource		*io;
 
 	at_dma_off(atdma);
+	if (pdev->dev.of_node)
+		of_dma_controller_free(pdev->dev.of_node);
 	dma_async_device_unregister(&atdma->dma_common);
 
 	dma_pool_destroy(atdma->dma_desc_pool);