From fbbde074abf41efddbb5daeb1690d7281d613a8e Mon Sep 17 00:00:00 2001 From: Thomas Pugliese Date: Thu, 8 Aug 2013 09:38:23 -0500 Subject: [PATCH] UWB: fix sysfs warning on HWA device unplug. In the disconnect routine for the hwa_hc interface, it calls uwb_pal_unregister to unregister itself from the UWB subsystem. This function attempts to clean up the link to the host controller directory in the device's UWB radio control interface directory. If the disconnect routine for the radio control interface has already run, the uwb directory will be gone so the call to sysfs_remove_link generates a warning. Signed-off-by: Thomas Pugliese Signed-off-by: Greg Kroah-Hartman --- drivers/uwb/pal.c | 40 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-) diff --git a/drivers/uwb/pal.c b/drivers/uwb/pal.c index 690577d2a35b..c1304b8d4985 100644 --- a/drivers/uwb/pal.c +++ b/drivers/uwb/pal.c @@ -68,8 +68,40 @@ int uwb_pal_register(struct uwb_pal *pal) } EXPORT_SYMBOL_GPL(uwb_pal_register); +static int find_rc(struct device *dev, const void *data) +{ + const struct uwb_rc *target_rc = data; + struct uwb_rc *rc = dev_get_drvdata(dev); + + if (rc == NULL) { + WARN_ON(1); + return 0; + } + if (rc == target_rc) { + if (rc->ready == 0) + return 0; + else + return 1; + } + return 0; +} + +/** + * Given a radio controller descriptor see if it is registered. + * + * @returns false if the rc does not exist or is quiescing; true otherwise. + */ +static bool uwb_rc_class_device_exists(struct uwb_rc *target_rc) +{ + struct device *dev; + + dev = class_find_device(&uwb_rc_class, NULL, target_rc, find_rc); + + return (dev != NULL); +} + /** - * uwb_pal_register - unregister a UWB PAL + * uwb_pal_unregister - unregister a UWB PAL * @pal: the PAL */ void uwb_pal_unregister(struct uwb_pal *pal) @@ -85,7 +117,11 @@ void uwb_pal_unregister(struct uwb_pal *pal) debugfs_remove(pal->debugfs_dir); if (pal->device) { - sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name); + /* remove link to the PAL in the UWB device's directory. */ + if (uwb_rc_class_device_exists(rc)) + sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name); + + /* remove link to uwb_rc in the PAL device's directory. */ sysfs_remove_link(&pal->device->kobj, "uwb_rc"); } } -- 2.30.2