From: Heikki Krogerus heikki.krogerus@linux.intel.com
commit c15e1bdda4365a5f17cdadf22bf1c1df13884a9e upstream.
When the primary firmware node pointer is removed from a device (set to NULL) the secondary firmware node pointer, when it exists, is made the primary node for the device. However, the secondary firmware node pointer of the original primary firmware node is never cleared (set to NULL).
To avoid situation where the secondary firmware node pointer is pointing to a non-existing object, clearing it properly when the primary node is removed from a device in set_primary_fwnode().
Fixes: 97badf873ab6 ("device property: Make it possible to use secondary firmware nodes") Cc: All applicable stable@vger.kernel.org Signed-off-by: Heikki Krogerus heikki.krogerus@linux.intel.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/base/core.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
--- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -2344,17 +2344,21 @@ static inline bool fwnode_is_primary(str */ void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode) { - if (fwnode) { - struct fwnode_handle *fn = dev->fwnode; + struct fwnode_handle *fn = dev->fwnode;
+ if (fwnode) { if (fwnode_is_primary(fn)) fn = fn->secondary;
fwnode->secondary = fn; dev->fwnode = fwnode; } else { - dev->fwnode = fwnode_is_primary(dev->fwnode) ? - dev->fwnode->secondary : NULL; + if (fwnode_is_primary(fn)) { + dev->fwnode = fn->secondary; + fn->secondary = NULL; + } else { + dev->fwnode = NULL; + } } } EXPORT_SYMBOL_GPL(set_primary_fwnode);