[PATCH] ASoC: wm_adsp: Put debugfs_remove_recursive back in

[PATCH] ASoC: wm_adsp: Put debugfs_remove_recursive back in

[Charles Keepax]

This patch reverts commit acbf58e53041 ("ASoC: wm_adsp: Let
soc_cleanup_component_debugfs remove debugfs"), and adds an
alternate solution to the issue. That patch removes the call to
debugfs_remove_recursive, which cleans up the DSPs debugfs. The
intention was to avoid an unbinding issue on an out of tree
driver/platform.

The issue with the patch is it means the driver no longer cleans up
its own debugfs, instead relying on ASoC to remove recurive on the
parent debugfs node. This is conceptually rather unclean, but also it
would prevent DSPs being added/removed independently of ASoC and soon
we are going to be upstreaming some non-audio parts with these DSPs,
which will require this.

Finally, it seems the issue on the platform is a result of the
wm_adsp2_cleanup_debugfs getting called twice. This is very likely a
problem on the platform side and will be resolved there. But in the mean
time make the code a little more robust to such issues, and again
conceptually a bit nicer, but clearing the debugfs_root variable in the
DSP structure when the debugfs is removed.

Fixes: acbf58e53041 ("ASoC: wm_adsp: Let soc_cleanup_component_debugfs remove debugfs"
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---
 sound/soc/codecs/wm_adsp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index bbe27ab3b1fc3..f7c800927cb2f 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -747,6 +747,8 @@ static void wm_adsp2_init_debugfs(struct wm_adsp *dsp,
 static void wm_adsp2_cleanup_debugfs(struct wm_adsp *dsp)
 {
 	wm_adsp_debugfs_clear(dsp);
+	debugfs_remove_recursive(dsp->debugfs_root);
+	dsp->debugfs_root = NULL;
 }
 #else
 static inline void wm_adsp2_init_debugfs(struct wm_adsp *dsp,
-- 
2.11.0

Re: [PATCH] ASoC: wm_adsp: Put debugfs_remove_recursive back in

[Mark Brown]

On Tue, 24 Aug 2021 11:15:52 +0100, Charles Keepax wrote:
> This patch reverts commit acbf58e53041 ("ASoC: wm_adsp: Let
> soc_cleanup_component_debugfs remove debugfs"), and adds an
> alternate solution to the issue. That patch removes the call to
> debugfs_remove_recursive, which cleans up the DSPs debugfs. The
> intention was to avoid an unbinding issue on an out of tree
> driver/platform.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: wm_adsp: Put debugfs_remove_recursive back in
      commit: e6d0b92ac00b53121a35b2a1ce8d393dc9179fdf

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark