cfg80211: remove CFG80211_MAX_NUM_DIFFERENT_CHANNELS

We no longer need to put any limits here, hardware will and
mac80211-hwsim can do whatever it likes. The reason we had
this was some accounting code (still mentioned in the comment)
but that code was deleted in commit c781944b ("cfg80211:
Remove unused cfg80211_can_use_iftype_chan()").

Link: https://lore.kernel.org/r/20210506221159.d1d61db1d31c.Iac4da68d54b9f1fdc18a03586bbe06aeb9515425@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/mac80211_hwsim.c

@@ -3796,11 +3796,6 @@ static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
 		return -EINVAL;
 	}
 
-	if (param.channels > CFG80211_MAX_NUM_DIFFERENT_CHANNELS) {
-		GENL_SET_ERR_MSG(info, "too many channels specified");
-		return -EINVAL;
-	}
-
 	if (info->attrs[HWSIM_ATTR_NO_VIF])
 		param.no_vif = true;
 

include/net/cfg80211.h

@@ -1245,8 +1245,6 @@ struct cfg80211_csa_settings {
 	u8 count;
 };
 
-#define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
-
 /**
  * struct iface_combination_params - input parameters for interface combinations
  *

net/wireless/core.c

@@ -589,14 +589,6 @@ static int wiphy_verify_combinations(struct wiphy *wiphy)
 		if (WARN_ON(!c->num_different_channels))
 			return -EINVAL;
 
-		/*
-		 * Put a sane limit on maximum number of different
-		 * channels to simplify channel accounting code.
-		 */
-		if (WARN_ON(c->num_different_channels >
-				CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
-			return -EINVAL;
-
 		/* DFS only works on one channel. */
 		if (WARN_ON(c->radar_detect_widths &&
 			    (c->num_different_channels > 1)))