linux-kernel - dma-api debugfs directory is not created since debugfs is not initialized

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Date:   Tue, 27 Apr 2021 13:34:27 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     gregkh@...uxfoundation.org, rafael@...nel.org, hch@....de,
        m.szyprowski@...sung.com, robin.murphy@....com
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: dma-api debugfs directory is not created since debugfs is not
 initialized

Hello

I try to debug some DMA problem on next-20210427, and so I have enabled CONFIG_DMA_API_DEBUG=y.
But the dma-api directory does show up in debugfs, but lot of other directory exists in it.

After debugging it seems due to commit 56348560d495 ("debugfs: do not attempt to create a new file before the filesystem is initalized")
Reverting the commit permit to "dma-api" debugfs to be found. (but seems not the right way to fix it).

Regards