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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: 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>
master
Greg Kroah-Hartman 2021-02-18 11:08:18 +01:00
parent bc6de804d3
commit 56348560d4
1 changed files with 3 additions and 0 deletions
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3
fs/debugfs/inode.c
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@ -318,6 +318,9 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
if (!(debugfs_allow & DEBUGFS_ALLOW_API))
return ERR_PTR(-EPERM);
if (!debugfs_initialized())
return ERR_PTR(-ENOENT);
pr_debug("creating file '%s'\n", name);
if (IS_ERR(parent))