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firmware: cirrus: cs_dsp: Initialize debugfs_root to invalid

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[ Upstream commit 66626b15636b5f5cf3d7f6104799f77462748974 ]

Initialize debugfs_root to -ENODEV so that if the client never sets a
valid debugfs root the debugfs files will not be created.

A NULL pointer passed to any of the debugfs_create_*() functions means
"create in the root of debugfs". It doesn't mean "ignore".

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://msgid.link/r/20240307105353.40067-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Richard Fitzgerald
2024-03-07 10:53:53 +00:00
committed by Greg Kroah-Hartman
parent 74ee5e6352
commit 97e16428c2
1 changed files with 6 additions and 1 deletions
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7
drivers/firmware/cirrus/cs_dsp.c
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@@ -490,7 +490,7 @@ void cs_dsp_cleanup_debugfs(struct cs_dsp *dsp)
{
cs_dsp_debugfs_clear(dsp);
debugfs_remove_recursive(dsp->debugfs_root);
dsp->debugfs_root = NULL;
dsp->debugfs_root = ERR_PTR(-ENODEV);
}
EXPORT_SYMBOL_GPL(cs_dsp_cleanup_debugfs);
#else
@@ -2300,6 +2300,11 @@ static int cs_dsp_common_init(struct cs_dsp *dsp)
mutex_init(&dsp->pwr_lock);
#ifdef CONFIG_DEBUG_FS
/* Ensure this is invalid if client never provides a debugfs root */
dsp->debugfs_root = ERR_PTR(-ENODEV);
#endif
return 0;
}