[PATCH V4] brcmfmac: print errors if creating interface fails

[RafaÅ MiÅecki]

This is helpful for debugging. Without this all I was getting from "iw"
command on failed creating of P2P interface was:
> command failed: Too many open files in system (-23)

Signed-off-by: RafaÅ MiÅecki <zajec5@xxxxxxxxx>
---
V2: s/in/if/ in commit message
V3: Add one more error message as suggested by Arend
V4: Also update brcmf_cfg80211_add_iface & print error for AP
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 8 ++++++--
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c      | 3 ++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 3d09d23..e7975a3 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -669,14 +669,18 @@ static struct wireless_dev *brcmf_cfg80211_add_iface(struct wiphy *wiphy,
 		return ERR_PTR(-EOPNOTSUPP);
 	case NL80211_IFTYPE_AP:
 		wdev = brcmf_ap_add_vif(wiphy, name, flags, params);
-		if (!IS_ERR(wdev))
+		if (IS_ERR(wdev))
+			brcmf_err("Failed to create AP interface %s: %d\n", name, PTR_ERR(wdev));
+		else
 			brcmf_cfg80211_update_proto_addr_mode(wdev);
 		return wdev;
 	case NL80211_IFTYPE_P2P_CLIENT:
 	case NL80211_IFTYPE_P2P_GO:
 	case NL80211_IFTYPE_P2P_DEVICE:
 		wdev = brcmf_p2p_add_vif(wiphy, name, name_assign_type, type, flags, params);
-		if (!IS_ERR(wdev))
+		if (IS_ERR(wdev))
+			brcmf_err("Failed to create P2P interface %s: %d\n", name, PTR_ERR(wdev));
+		else
 			brcmf_cfg80211_update_proto_addr_mode(wdev);
 		return wdev;
 	case NL80211_IFTYPE_UNSPECIFIED:
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
index 1652a48..bc26aec 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
@@ -2031,7 +2031,7 @@ static int brcmf_p2p_request_p2p_if(struct brcmf_p2p_info *p2p,
 	err = brcmf_fil_iovar_data_set(ifp, "p2p_ifadd", &if_request,
 				       sizeof(if_request));
 	if (err)
-		return err;
+		brcmf_err("p2p_ifadd failed %d\n", err);
 
 	return err;
 }
@@ -2185,6 +2185,7 @@ struct wireless_dev *brcmf_p2p_add_vif(struct wiphy *wiphy, const char *name,
 	err = brcmf_p2p_request_p2p_if(&cfg->p2p, ifp, cfg->p2p.int_addr,
 				       iftype);
 	if (err) {
+		brcmf_err("Failed to request P2P virtual interface %s\n", name);
 		brcmf_cfg80211_arm_vif_event(cfg, NULL);
 		goto fail;
 	}
-- 
1.8.4.5