rfkill: remove user_claim stuff

Almost all drivers do not support user_claim, so remove it
completely and always report -EOPNOTSUPP to userspace. Since
userspace cannot really drive rfkill _anyway_ (due to the
odd restrictions imposed by the documentation) having this
code is just pointless.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 42 deletions

diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
index 3eaa39403c13..df1269c5ca70 100644
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -200,7 +200,7 @@ static void __rfkill_switch_all(const enum rfkill_type type,
 
         rfkill_global_states[type].current_state = state;
         list_for_each_entry(rfkill, &rfkill_list, node) {
-                if ((!rfkill->user_claim) && (rfkill->type == type)) {
+                if (rfkill->type == type) {
                         mutex_lock(&rfkill->mutex);
                         rfkill_toggle_radio(rfkill, state, 0);
                         mutex_unlock(&rfkill->mutex);
@@ -447,53 +447,14 @@ static ssize_t rfkill_claim_show(struct device *dev,
                                  struct device_attribute *attr,
                                  char *buf)
 {
-        struct rfkill *rfkill = to_rfkill(dev);
-
-        return sprintf(buf, "%d\n", rfkill->user_claim);
+        return sprintf(buf, "%d\n", 0);
 }
 
 static ssize_t rfkill_claim_store(struct device *dev,
                                   struct device_attribute *attr,
                                   const char *buf, size_t count)
 {
-        struct rfkill *rfkill = to_rfkill(dev);
-        unsigned long claim_tmp;
-        bool claim;
-        int error;
-
-        if (!capable(CAP_NET_ADMIN))
-                return -EPERM;
-
-        if (rfkill->user_claim_unsupported)
-                return -EOPNOTSUPP;
-
-        error = strict_strtoul(buf, 0, &claim_tmp);
-        if (error)
-                return error;
-        claim = !!claim_tmp;
-
-        /*
-         * Take the global lock to make sure the kernel is not in
-         * the middle of rfkill_switch_all
-         */
-        error = mutex_lock_killable(&rfkill_global_mutex);
-        if (error)
-                return error;
-
-        if (rfkill->user_claim != claim) {
-                if (!claim && !rfkill_epo_lock_active) {
-                        mutex_lock(&rfkill->mutex);
-                        rfkill_toggle_radio(rfkill,
-                                        rfkill_global_states[rfkill->type].current_state,
-                                        0);
-                        mutex_unlock(&rfkill->mutex);
-                }
-                rfkill->user_claim = claim;
-        }
-
-        mutex_unlock(&rfkill_global_mutex);
-
-        return error ? error : count;
+        return -EOPNOTSUPP;
 }
 
 static struct device_attribute rfkill_dev_attrs[] = {