4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Richard Genoud richard.genoud@gmail.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().
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
--- drivers/dma/at_hdmac.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -2145,6 +2145,8 @@ 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->memset_pool);