mac80211: document sleep requirements for channel context ops

Channel context driver operations can sleep, so add might_sleep()
and document this.

Signed-off-by: Chaitanya T K <chaitanya.mgit@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 18 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index dac575c55c62..82045fca388b 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -3172,18 +3172,24 @@ enum ieee80211_reconfig_type {
  *      The callback is optional and can sleep.
  *
  * @add_chanctx: Notifies device driver about new channel context creation.
+ *      This callback may sleep.
  * @remove_chanctx: Notifies device driver about channel context destruction.
+ *      This callback may sleep.
  * @change_chanctx: Notifies device driver about channel context changes that
  *      may happen when combining different virtual interfaces on the same
  *      channel context with different settings
+ *      This callback may sleep.
  * @assign_vif_chanctx: Notifies device driver about channel context being bound
  *      to vif. Possible use is for hw queue remapping.
+ *      This callback may sleep.
  * @unassign_vif_chanctx: Notifies device driver about channel context being
  *      unbound from vif.
+ *      This callback may sleep.
  * @switch_vif_chanctx: switch a number of vifs from one chanctx to
  *      another, as specified in the list of
  *      @ieee80211_vif_chanctx_switch passed to the driver, according
  *      to the mode defined in &ieee80211_chanctx_switch_mode.
+ *      This callback may sleep.
  *
  * @start_ap: Start operation on the AP interface, this is called after all the
  *      information in bss_conf is set and beacon can be retrieved. A channel
diff --git a/net/mac80211/driver-ops.c b/net/mac80211/driver-ops.c
index 9f97343f13fd..ca1fe5576103 100644
--- a/net/mac80211/driver-ops.c
+++ b/net/mac80211/driver-ops.c
@@ -236,6 +236,8 @@ int drv_switch_vif_chanctx(struct ieee80211_local *local,
         int ret = 0;
         int i;
 
+        might_sleep();
+
         if (!local->ops->switch_vif_chanctx)
                 return -EOPNOTSUPP;
 
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index f82cfab615f2..154ce4b13406 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -843,6 +843,8 @@ static inline int drv_add_chanctx(struct ieee80211_local *local,
 {
         int ret = -EOPNOTSUPP;
 
+        might_sleep();
+
         trace_drv_add_chanctx(local, ctx);
         if (local->ops->add_chanctx)
                 ret = local->ops->add_chanctx(&local->hw, &ctx->conf);
@@ -856,6 +858,8 @@ static inline int drv_add_chanctx(struct ieee80211_local *local,
 static inline void drv_remove_chanctx(struct ieee80211_local *local,
                                       struct ieee80211_chanctx *ctx)
 {
+        might_sleep();
+
         if (WARN_ON(!ctx->driver_present))
                 return;
 
@@ -870,6 +874,8 @@ static inline void drv_change_chanctx(struct ieee80211_local *local,
                                       struct ieee80211_chanctx *ctx,
                                       u32 changed)
 {
+        might_sleep();
+
         trace_drv_change_chanctx(local, ctx, changed);
         if (local->ops->change_chanctx) {
                 WARN_ON_ONCE(!ctx->driver_present);
@@ -903,6 +909,8 @@ static inline void drv_unassign_vif_chanctx(struct ieee80211_local *local,
                                             struct ieee80211_sub_if_data *sdata,
                                             struct ieee80211_chanctx *ctx)
 {
+        might_sleep();
+
         if (!check_sdata_in_driver(sdata))
                 return;
 
@@ -925,6 +933,8 @@ static inline int drv_start_ap(struct ieee80211_local *local,
 {
         int ret = 0;
 
+        might_sleep();
+
         if (!check_sdata_in_driver(sdata))
                 return -EIO;