driver core: Prevent warning when removing a device link from unregistered consumer

commit e64daad660a0c9ace3acdc57099fffe5ed83f977 upstream.

sysfs_remove_link() causes a warning if the parent directory does not
exist. That can happen if the device link consumer has not been registered.
So do not attempt sysfs_remove_link() in that case.

Fixes: 287905e68dd29 ("driver core: Expose device link details in sysfs")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org # 5.9+
Reviewed-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20210716114408.17320-2-adrian.hunter@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 8b3c3fcf35a96c4777ff5548a816712f5b3dbc41..1157f9aea9c04f43d4ae39f3e85e6f2cf5cf243c 100644 (file)
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -449,8 +449,10 @@ static void devlink_remove_symlinks(struct device *dev,
                return;
        }
 
-       snprintf(buf, len, "supplier:%s:%s", dev_bus_name(sup), dev_name(sup));
-       sysfs_remove_link(&con->kobj, buf);
+       if (device_is_registered(con)) {
+               snprintf(buf, len, "supplier:%s:%s", dev_bus_name(sup), dev_name(sup));
+               sysfs_remove_link(&con->kobj, buf);
+       }
        snprintf(buf, len, "consumer:%s:%s", dev_bus_name(con), dev_name(con));
        sysfs_remove_link(&sup->kobj, buf);
        kfree(buf);