dmaengine: at_hdmac: fix module unloading

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().

Cc: stable@vger.kernel.org
Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding")
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index c4123b6507e2fcaac80d1f0eb39fb83acb603b2b..941ace0521306cfe9065a6ce8b25374b346bc339 100644 (file)
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -2152,6 +2152,8 @@ static int at_dma_remove(struct platform_device *pdev)
        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->memset_pool);