在 2018年08月03日 15:55, Peter Ujfalusi 写道:
On 2018-08-03 10:19, Huang Shijie wrote:Use dmaenginem_async_device_register to simplify the code: remove dma_async_device_unregister Signed-off-by: Huang Shijie <sjhu...@iluvatar.ai> --- drivers/dma/ti/cppi41.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/drivers/dma/ti/cppi41.c b/drivers/dma/ti/cppi41.c index 1497da367710..d2998a19ed2e 100644 --- a/drivers/dma/ti/cppi41.c +++ b/drivers/dma/ti/cppi41.c @@ -1096,21 +1096,19 @@ static int cppi41_dma_probe(struct platform_device *pdev) goto err_chans; cdd->irq = irq;- ret = dma_async_device_register(&cdd->ddev);+ ret = dmaenginem_async_device_register(&cdd->ddev); if (ret) goto err_chans;ret = of_dma_controller_register(dev->of_node,cppi41_dma_xlate, &cpp41_dma_info); if (ret) - goto err_of; + goto err_chans;pm_runtime_mark_last_busy(dev);pm_runtime_put_autosuspend(dev);return 0;-err_of: - dma_async_device_unregister(&cdd->ddev); err_chans: deinit_cppi41(dev, cdd); err_init_cppi: @@ -1132,7 +1130,6 @@ static int cppi41_dma_remove(struct platform_device *pdev) dev_err(&pdev->dev, "%s could not pm_runtime_get: %i\n", __func__, error); of_dma_controller_free(pdev->dev.of_node); - dma_async_device_unregister(&cdd->ddev);If I read the code right then this is not safe. We would have deinitalized cppi41 driver which is not functional, but we will still have the dma device registered and if a channel is requested we will have kernel crash. It falls in the same case as omap-dma, edma.
Thanks for pointing this, we can drop the patches for omap-dma, edma. Huang Shijie
