A refcount issue can appeared in __fwnode_link_del() due to the pr_debug() call: WARNING: CPU: 0 PID: 901 at lib/refcount.c:25 refcount_warn_saturate+0xe5/0x110 Call Trace: <TASK> ... of_node_get+0x1e/0x30 of_fwnode_get+0x28/0x40 fwnode_full_name_string+0x34/0x90 fwnode_string+0xdb/0x140 ... vsnprintf+0x17b/0x630 ... __fwnode_link_del+0x25/0xa0 fwnode_links_purge+0x39/0xb0 of_node_release+0xd9/0x180 ...

Indeed, an fwnode (of_node) is being destroyed and so, of_node_release() is called because the of_node refcount reached 0. From of_node_release() several function calls are done and lead to a pr_debug() calls with %pfwf to print the fwnode full name. The issue is not present if we change %pfwf to %pfwP.

To print the full name, %pfwf iterates over the current node and its parents and obtain/drop a reference to all nodes involved.

In order to allow to print the full name (%pfwf) of a node while it is being destroyed, do not obtain/drop a reference to this current node.

Fixes: a92eb7621b9f ("lib/vsprintf: Make use of fwnode API to obtain node names and separators") Cc: stable@vger.kernel.org Signed-off-by: Herve Codina herve.codina@bootlin.com Reviewed-by: Sakari Ailus sakari.ailus@linux.intel.com Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com --- Changes v2 -> v3 - Fix typo in comment ("ie parents node" -> "i.e. parent nodes") - Add 'Reviewed-by: Sakari Ailus sakari.ailus@linux.intel.com' - Add 'Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com'

Changes v1 -> v2 - Avoid handling current node out of the loop. Instead obtain/drop references in the loop based on the depth value. - Remove some of the backtrace lines in the commit log.

lib/vsprintf.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c index afb88b24fa74..2aa408441cd3 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -2110,15 +2110,20 @@ char *fwnode_full_name_string(struct fwnode_handle *fwnode, char *buf,

/* Loop starting from the root node to the current node. */ for (depth = fwnode_count_parents(fwnode); depth >= 0; depth--) { - struct fwnode_handle *__fwnode = - fwnode_get_nth_parent(fwnode, depth); + /* + * Only get a reference for other nodes (i.e. parent nodes). + * fwnode refcount may be 0 here. + */ + struct fwnode_handle *__fwnode = depth ? + fwnode_get_nth_parent(fwnode, depth) : fwnode;

buf = string(buf, end, fwnode_get_name_prefix(__fwnode), default_str_spec); buf = string(buf, end, fwnode_get_name(__fwnode), default_str_spec);

- fwnode_handle_put(__fwnode); + if (depth) + fwnode_handle_put(__fwnode); }

return buf;