dmaengine: fsl-edma: cleanup chan after dma_async_device_unregister

JIRA: https://issues.redhat.com/browse/RHEL-115725

commit c9c59da
Author: Peng Fan <peng.fan@nxp.com>
Date:   Fri Feb 28 15:17:19 2025 +0800

    dmaengine: fsl-edma: cleanup chan after dma_async_device_unregister

    There is kernel dump when do module test:
    sysfs: cannot create duplicate filename
    /devices/platform/soc@0/44000000.bus/44000000.dma-controller/dma/dma0chan0
     __dma_async_device_channel_register+0x128/0x19c
     dma_async_device_register+0x150/0x454
     fsl_edma_probe+0x6cc/0x8a0
     platform_probe+0x68/0xc8

    fsl_edma_cleanup_vchan will unlink vchan.chan.device_node, while
    dma_async_device_unregister  needs the link to do
    __dma_async_device_channel_unregister. So need move fsl_edma_cleanup_vchan
    after dma_async_device_unregister to make sure channel could be freed.

    So clean up chan after dma_async_device_unregister to address this.

    Fixes: 6f93b93 ("dmaengine: fsl-edma: kill the tasklets upon exit")
    Reviewed-by: Frank Li <Frank.Li@nxp.com>
    Signed-off-by: Peng Fan <peng.fan@nxp.com>
    Link: https://lore.kernel.org/r/20250228071720.3780479-1-peng.fan@oss.nxp.com
    Signed-off-by: Vinod Koul <vkoul@kernel.org>

Signed-off-by: Jared Kangas <jkangas@redhat.com>

Author: rh-jkangas

drivers/dma/fsl-edma-main.c

@@ -802,9 +802,9 @@ static void fsl_edma_remove(struct platform_device *pdev)
 	struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev);
 
 	fsl_edma_irq_exit(pdev, fsl_edma);
-	fsl_edma_cleanup_vchan(&fsl_edma->dma_dev);
 	of_dma_controller_free(np);
 	dma_async_device_unregister(&fsl_edma->dma_dev);
+	fsl_edma_cleanup_vchan(&fsl_edma->dma_dev);
 	fsl_disable_clocks(fsl_edma, fsl_edma->drvdata->dmamuxs);
 }