Re: brcmfmac: Failed to create interface p2p-dev-p2p0: -28 (No space left on device)

["Jörg Krause" <joerg.krause@embedded.rocks>]

On Do, 2015-06-18 at 10:27 +0200, Arend van Spriel wrote:
> On 06/18/15 08:13, Jörg Krause wrote:
> > Hi Arend,
> > 
> > On Di, 2015-06-16 at 16:26 +0200, Arend van Spriel wrote:
> > > On 06/16/15 11:59, Jörg Krause wrote:
> > > > Hi Arend,
> > > > 
> > > > as I wrote in my previous mail ("brcmfmac: 
> > > > brcmf_p2p_create_p2pdev:
> > > > timeout occurred") I get a p2p0 interface when loading the 
> > > > brcmfmac
> > > > module with p2pon=1 (Linux kernel 4.0.5, BCM43362).
> > > > 
> > > > Unfortunatly, if I try to use the p2p0 interface with
> > > > wpa_supplicant
> > > > 2.4 I get an error:
> > > > 
> > > >       Failed to create interface p2p-dev-p2p0: -28 (No space 
> > > > left on
> > > >       device)
> > > >       nl80211: Failed to create a P2P Device interface p2p-dev
> > > > -p2p0
> > > >       P2P: Failed to enable P2P Device interface
> > > 
> > > Using p2pon=1 is old-school p2p, ie. it creates a regular netdev 
> > > for
> > > doing p2p management stuff. Problem is that brcmfmac also 
> > > indicates
> > > p2p
> > > device support. We can remove p2pon parameter or not indicate p2p 
> > > dev
> > > 
> > > support when p2pon=1.
> > 
> > I used p2pon because the p2p0 interface is not created without it. 
> > It
> > fails with the error message "brcmf_p2p_create_p2pdev: timeout
> > occurred" as written in my previous mails. I would prefer not to 
> > use
> > it, so maybe we can find a solution how to get it working without 
> > it.
> 
> 43362 firmware may have issues with regular p2p dev support so let's 
> stick with p2pon for now.

Okay.

> > > 
> > > Can you patch brcmfmac and give it a try. Need to start
> > > wpa_supplicant
> > > for two interface and if I recall correctly p2p0 must be 
> > > specified
> > > first.
> > 
> > Can you give me a hint where to patch brcmfmac. Many thanks!
> 
> Attached is patch against 4.0.5 kernel.

I applied the patch and if I load brcmfmac with p2pon=1 I get a kernel
warning and _no_ wlan0 and p2p0 interfaces:

    [    7.577223] ------------[ cut here ]------------
    [    7.583144] WARNING: CPU: 0 PID: 4 at net/wireless/core.c:527
    wiphy_register+0x3a4/0x67c()
    [    7.594652] Modules linked in: brcmfmac brcmutil
    [    7.601507] CPU: 0 PID: 4 Comm: kworker/0:0 Not tainted 4.0.5
    -LINTECH #3
    [    7.610809] Hardware name: Freescale MXS (Device Tree)
    [    7.617411] Workqueue: events request_firmware_work_func
    [    7.625110] [<c000dec8>] (unwind_backtrace) from [<c000c25c>]
    (show_stack+0x10/0x14)
    [    7.635541] [<c000c25c>] (show_stack) from [<c001613c>]
    (warn_slowpath_common+0x78/0xb0)
    [    7.645171] [<c001613c>] (warn_slowpath_common) from
    [<c0016210>] (warn_slowpath_null+0x1c/0x24)
    [    7.656635] [<c0016210>] (warn_slowpath_null) from [<c03b6f20>]
    (wiphy_register+0x3a4/0x67c)
    [    7.666657] [<c03b6f20>] (wiphy_register) from [<bf00de20>]
    (brcmf_cfg80211_attach+0x86c/0x1124 [brcmfmac])
    [    7.679412] [<bf00de20>] (brcmf_cfg80211_attach [brcmfmac]) from
    [<bf018f3c>] (brcmf_bus_start+0xac/0x29c [brcmfmac])
    [    7.690925] [<bf018f3c>] (brcmf_bus_start [brcmfmac]) from
    [<bf01dd00>] (brcmf_sdio_firmware_callback+0x3d8/0x9e8 [brcmfmac])
    [    7.705622] [<bf01dd00>] (brcmf_sdio_firmware_callback
    [brcmfmac]) from [<bf0195fc>]
    (brcmf_fw_request_nvram_done+0x134/0x1d0 [brcmfmac])
    [    7.718916] [<bf0195fc>] (brcmf_fw_request_nvram_done
    [brcmfmac]) from [<c020ab88>]
    (request_firmware_work_func+0x30/0x50)
    [    7.733292] [<c020ab88>] (request_firmware_work_func) from
    [<c0029a98>] (process_one_work+0x184/0x418)
    [    7.744112] [<c0029a98>] (process_one_work) from [<c002a694>]
    (worker_thread+0x3c/0x464)
    [    7.754977] [<c002a694>] (worker_thread) from [<c002e130>]
    (kthread+0xc0/0xdc)
    [    7.763730] [<c002e130>] (kthread) from [<c0009730>]
    (ret_from_fork+0x14/0x24)
    [    7.773568] ---[ end trace 39ec555e61fc038e ]---
    [    7.779710] brcmfmac: brcmf_cfg80211_attach: Could not register
    wiphy device (-22)
    [    7.790013] brcmfmac: brcmf_bus_start: failed: -12
    [    7.800278] brcmfmac: brcmf_sdio_firmware_callback: dongle is
    not responding

Best regards
Jörg Krause