The following commit has been merged into the irq/irqchip-next branch of irqchip:
Commit-ID: fb0757f54bc9259c4c67907fd97ca3ad109d3f6f Gitweb: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/fb0757f54b... Author: Greg Kroah-Hartman gregkh@linuxfoundation.org AuthorDate: Thu, 18 Feb 2021 11:08:18 +01:00 Committer: Marc Zyngier maz@kernel.org CommitterDate: Thu, 18 Feb 2021 11:39:18
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.
Reported-by: Michael Walle michael@walle.cc Reported-by: Marc Zyngier maz@kernel.org Cc: "Rafael J. Wysocki" rafael@kernel.org Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Marc Zyngier maz@kernel.org Link: https://lore.kernel.org/r/20210218100818.3622317-2-gregkh@linuxfoundation.or... --- fs/debugfs/inode.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index bbeb563..86c7f04 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -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))