From cb746e47837ad0f35c8ae28e9aacc8eb07916d2a Mon Sep 17 00:00:00 2001
From: Arend Van Spriel <arend.vanspriel@broadcom.com>
Date: Thu, 26 Apr 2018 12:16:47 +0200
Subject: [PATCH] brcmfmac: check p2pdev mac address uniqueness
Git-commit: cb746e47837ad0f35c8ae28e9aacc8eb07916d2a
Patch-mainline: v4.18-rc1
References: FATE#326294

The mac address for p2pdev must be different from the primary interface
due to firmware requirement. Add an explicit check for this requirement
if user-space provides a mac address.

Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
index bcef208a81a5..4b2149b48362 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
@@ -2073,6 +2073,13 @@ static struct wireless_dev *brcmf_p2p_create_p2pdev(struct brcmf_p2p_info *p2p,
 	}
 
 	pri_ifp = p2p->bss_idx[P2PAPI_BSSCFG_PRIMARY].vif->ifp;
+
+	/* firmware requires unique mac address for p2pdev interface */
+	if (addr && ether_addr_equal(addr, pri_ifp->mac_addr)) {
+		brcmf_err("discovery vif must be different from primary interface\n");
+		return ERR_PTR(-EINVAL);
+	}
+
 	brcmf_p2p_generate_bss_mac(p2p, addr);
 	brcmf_p2p_set_firmware(pri_ifp, p2p->dev_addr);
 
-- 
2.19.2