debugfs: do not attempt to create a new file before the filesystem is initalized
commit 56348560d495d2501e87db559a61de717cd3ab02 upstream. Some subsystems want to add debugfs files at early boot, way before debugfs is initialized. This seems to work somehow as the vfs layer will not allow it to happen, but let's be explicit and test to ensure we are properly up and running before allowing files to be created. Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: stable <stable@vger.kernel.org> Reported-by: Michael Walle <michael@walle.cc> Reported-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210218100818.3622317-2-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -315,6 +315,9 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
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struct dentry *dentry;
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struct dentry *dentry;
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int error;
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int error;
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if (!debugfs_initialized())
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return ERR_PTR(-ENOENT);
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pr_debug("creating file '%s'\n", name);
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pr_debug("creating file '%s'\n", name);
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if (IS_ERR(parent))
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if (IS_ERR(parent))
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