MIME-Version: 1.0
In-Reply-To: <CACna6rzA1JcTjBsozR5nhCH9U9bKwceTNwLzeQ-Ds97NECVaeQ@mail.gmail.com>
References: <CACna6rzA1JcTjBsozR5nhCH9U9bKwceTNwLzeQ-Ds97NECVaeQ@mail.gmail.com>
Date: Tue, 22 Mar 2016 07:36:38 +0100
Message-ID: <CACna6rwgOuUtgjduwgQoZPFewZ3Wn2vgXapCvqw1ygbyt3Jqaw@mail.gmail.com> (sfid-20160322_073643_962963_6846545A)
Subject: Re: Problem with brcmfmac removing extra interface
From: =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>
To: brcm80211 development <brcm80211-dev-list@broadcom.com>
Cc: "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
	Brett Rudley <brudley@broadcom.com>,
	Arend van Spriel <arend@broadcom.com>,
	"Franky (Zhenhui) Lin" <frankyl@broadcom.com>,
	Hante Meuleman <meuleman@broadcom.com>
Content-Type: text/plain; charset=UTF-8
Sender: linux-wireless-owner@vger.kernel.org

On 3 March 2016 at 23:37, Rafał Miłecki <zajec5@gmail.com> wrote:
> brcmfmac in general is not capable of removing interfaces. If you take
> a look at brcmf_cfg80211_del_iface implementation, you'll see it
> returns -EOPNOTSUPP (except for p2p interfaces).
>
> However there is problem in handling NL80211_CMD_STOP_AP (with the
> brcmf_cfg80211_stop_ap callback). Current implementation calls
> brcmf_fil_cmd_int_set(ifp, BRCMF_C_DOWN, 1)
> if mbss support is enabled/used.
>
> Above call results in firmware generating BRCMF_E_LINK event. This
> event is handled with the following forward-traced functions chain:
> 1) brcmf_notify_connect_status
> 2) brcmf_notify_connect_status_ap
> 3) brcmf_remove_interface
> 4) brcmf_del_if
> 5) brcmf_net_detach
> 6) unregister_netdev
>
> So the result of NL80211_CMD_STOP_AP is interface being removed. The
> problem with this behavior is that interface can't be recreated after
> that:
> # iw phy phy1 interface add wlan1-1 type __ap
> [ 3602.929199] brcmfmac: brcmf_ap_add_vif: timeout occurred
> command failed: I/O error (-5)
>
> I hit this problem when trying to restart hostapd using BCM43602 and 2 BSSes.
>
> Could you analyze this problem and see if you see some way of solving
> this problem, please?

Hi, any ideas / help regarding this issue?

-- 
Rafał