summaryrefslogtreecommitdiff
path: root/drivers/usb/roles
diff options
context:
space:
mode:
authorHans de Goede <hdegoede@redhat.com>2021-04-09 14:41:36 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-04-09 16:07:03 +0200
commit3a2a91a2d51761557843996a66098eb7182b48b4 (patch)
treeeb31bc4481d9b538c1947e76102dcbd5a311ecfc /drivers/usb/roles
parent124b11cc4f6276e9e435802b160c368f35f59e1a (diff)
usb: roles: Call try_module_get() from usb_role_switch_find_by_fwnode()
usb_role_switch_find_by_fwnode() returns a reference to the role-switch which must be put by calling usb_role_switch_put(). usb_role_switch_put() calls module_put(sw->dev.parent->driver->owner), add a matching try_module_get() to usb_role_switch_find_by_fwnode(), making it behave the same as the other usb_role_switch functions which return a reference. This avoids a WARN_ON being hit at kernel/module.c:1158 due to the module-refcount going below 0. Fixes: c6919d5e0cd1 ("usb: roles: Add usb_role_switch_find_by_fwnode()") Cc: stable <stable@vger.kernel.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20210409124136.65591-1-hdegoede@redhat.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/roles')
-rw-r--r--drivers/usb/roles/class.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index 97f37077b7f9..33b637d0d8d9 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -189,6 +189,8 @@ usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode)
return NULL;
dev = class_find_device_by_fwnode(role_class, fwnode);
+ if (dev)
+ WARN_ON(!try_module_get(dev->parent->driver->owner));
return dev ? to_role_switch(dev) : NULL;
}