brcmfmac: check p2pdev mac address uniqueness

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: NHante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: NPieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: NFranky Lin <franky.lin@broadcom.com>
Signed-off-by: NArend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

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);