| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 16/91] dmaengine: at_hdmac: fix module unloading | Date | Tue, 11 Dec 2018 16:40:35 +0100 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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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 @@ -2152,6 +2152,8 @@ 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);
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