Commit 56348560 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman

debugfs: do not attempt to create a new file before the filesystem is initalized

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: default avatarMichael Walle <michael@walle.cc>
Reported-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210218100818.3622317-2-gregkh@linuxfoundation.orgSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bc6de804
...@@ -318,6 +318,9 @@ static struct dentry *start_creating(const char *name, struct dentry *parent) ...@@ -318,6 +318,9 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
if (!(debugfs_allow & DEBUGFS_ALLOW_API)) if (!(debugfs_allow & DEBUGFS_ALLOW_API))
return ERR_PTR(-EPERM); return ERR_PTR(-EPERM);
if (!debugfs_initialized())
return ERR_PTR(-ENOENT);
pr_debug("creating file '%s'\n", name); pr_debug("creating file '%s'\n", name);
if (IS_ERR(parent)) if (IS_ERR(parent))
......
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