Re: Re: [PATCH] mwifiex: fixes the trivial print

[Xinming Hu]

Hi Caesar,

The original log in google issue tracker show there exist AP in channel 13 after periodically scan. 
Per my understand, if reg domain is set to US,  channel 12/13/14 will not get chance to scan. (test using iw/wpa_supplicant).
I am curious about whether there are any diff from upper layer.

As a test, you can print the scan channel list, as below:

diff --git a/drivers/net/wireless/marvell/mwifiex/cfg80211.c b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
index a7593aa..a289818 100644
--- a/drivers/net/wireless/marvell/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
@@ -2572,6 +2572,7 @@ static int mwifiex_set_ibss_params(struct mwifiex_private *priv,
                              MWIFIEX_USER_SCAN_CHAN_MAX); i++) {
                chan = request->channels[i];
                user_scan_cfg->chan_list[i].chan_number = chan->hw_value;
+               pr_err("chan->hw_value = %d", chan->hw_value);
                user_scan_cfg->chan_list[i].radio_type = chan->band;
 
                if ((chan->flags & IEEE80211_CHAN_NO_IR) || !request->n_ssids)

Regards,
Simon

> -----Original Message-----
> From: Kalle Valo [mailto:kvalo@xxxxxxxxxxxxxx]
> Sent: 2017å6æ13æ 15:53
> To: Caesar Wang
> Cc: amitkarwar@xxxxxxxxx; Xinming Hu; Nishant Sarmukadam; Ganapathi
> Bhat; linux-wireless@xxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; briannorris@xxxxxxxxxxxx;
> jeffy.chen@xxxxxxxxxxxxxx
> Subject: [EXT] Re: [PATCH] mwifiex: fixes the trivial print
> 
> External Email
> 
> ----------------------------------------------------------------------
> Caesar Wang <wxt@xxxxxxxxxxxxxx> writes:
> 
> > å 2017å06æ13æ 15:04, Kalle Valo åé:
> >> Caesar Wang <wxt@xxxxxxxxxxxxxx> writes:
> >>
> >>> Kalle,
> >>>
> >>> å 2017å06æ13æ 14:28, Kalle Valo åé:
> >>>> Caesar Wang <wxt@xxxxxxxxxxxxxx> writes:
> >>>>
> >>>>> We have always met the unused log be printed as following.
> >>>>>
> >>>>> ...
> >>>>> [23193.523182] mwifiex_pcie 0000:01:00.0: mwifiex_get_cfp:
> >>>>> cannot find cfp by band 2    & channel=13 freq=0
> >>>>> [23378.633684] mwifiex_pcie 0000:01:00.0: mwifiex_get_cfp:
> >>>>> cannot find cfp by band 2    & channel=13 freq=0
> >>>>>
> >>>>> Maybe that's related to wifi regdom, since wifi default area was
> >>>>> US and didn't support 12~14 channels.
> >>>>>
> >>>>> As Frequencies:
> >>>>> * 2412 MHz [1] (30.0 dBm)
> >>>>> * 2417 MHz [2] (30.0 dBm)
> >>>>> * 2422 MHz [3] (30.0 dBm)
> >>>>> * 2427 MHz [4] (30.0 dBm)
> >>>>> * 2432 MHz [5] (30.0 dBm)
> >>>>> * 2437 MHz [6] (30.0 dBm)
> >>>>> * 2442 MHz [7] (30.0 dBm)
> >>>>> * 2447 MHz [8] (30.0 dBm)
> >>>>> * 2452 MHz [9] (30.0 dBm)
> >>>>> * 2457 MHz [10] (30.0 dBm)
> >>>>> * 2462 MHz [11] (30.0 dBm)
> >>>>> * 2467 MHz [12] (disabled)
> >>>>> * 2472 MHz [13] (disabled)
> >>>>> * 2484 MHz [14] (disabled)
> >>>>>
> >>>>> Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx>
> >>>>> ---
> >>>>>
> >>>>>    drivers/net/wireless/marvell/mwifiex/cfp.c | 2 +-
> >>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
> >>>>>
> >>>>> diff --git a/drivers/net/wireless/marvell/mwifiex/cfp.c
> >>>>> b/drivers/net/wireless/marvell/mwifiex/cfp.c
> >>>>> index 1ff2205..6e29943 100644
> >>>>> --- a/drivers/net/wireless/marvell/mwifiex/cfp.c
> >>>>> +++ b/drivers/net/wireless/marvell/mwifiex/cfp.c
> >>>>> @@ -350,7 +350,7 @@ mwifiex_get_cfp(struct mwifiex_private *priv, u8
> band, u16 channel, u32 freq)
> >>>>>    		}
> >>>>>    	}
> >>>>>    	if (i == sband->n_channels) {
> >>>>> -		mwifiex_dbg(priv->adapter, ERROR,
> >>>>> +		mwifiex_dbg(priv->adapter, WARN,
> >>>>>    			    "%s: cannot find cfp by band %d\t"
> >>>>>    			    "& channel=%d freq=%d\n",
> >>>>>    			    __func__, band, channel, freq);
> >>>> I don't see how this fixes anything, care to explain? And the title
> >>>> is quite vague.
> >>> Sorry for the description maybe unclear.
> >>> I'm assuming the print log is expected for marvel wifi driver. Do we
> >>> should use 'WARN' to instead of the 'ERROR' here.
> >> But does that make any functional difference, isn't the warning still
> >> printed?
> >>
> >
> > At least, that shouldn't be printed log by default.  :)
> >
> > if I read the code is correct. That only the MSG/FATAL/ERROR will
> > output by default.
> >
> > /**
> >  *enum mwifiex_debug_level  -  marvell wifi debug level  */ enum
> > MWIFIEX_DEBUG_LEVEL {
> >     MWIFIEX_DBG_MSG        = 0x00000001,
> >     MWIFIEX_DBG_FATAL    = 0x00000002,
> >     MWIFIEX_DBG_ERROR    = 0x00000004,
> >     MWIFIEX_DBG_DATA    = 0x00000008,
> >     MWIFIEX_DBG_CMD        = 0x00000010,
> >     MWIFIEX_DBG_EVENT    = 0x00000020,
> >     MWIFIEX_DBG_INTR    = 0x00000040,
> >     MWIFIEX_DBG_IOCTL    = 0x00000080,
> >
> >     MWIFIEX_DBG_MPA_D    = 0x00008000,
> >     MWIFIEX_DBG_DAT_D    = 0x00010000,
> >     MWIFIEX_DBG_CMD_D    = 0x00020000,
> >     MWIFIEX_DBG_EVT_D    = 0x00040000,
> >     MWIFIEX_DBG_FW_D    = 0x00080000,
> >     MWIFIEX_DBG_IF_D    = 0x00100000,
> >
> >     MWIFIEX_DBG_ENTRY    = 0x10000000,
> >     MWIFIEX_DBG_WARN    = 0x20000000,
> >     MWIFIEX_DBG_INFO    = 0x40000000,
> >     MWIFIEX_DBG_DUMP    = 0x80000000,
> >
> >     MWIFIEX_DBG_ANY        = 0xffffffff
> > };
> >
> > #define MWIFIEX_DEFAULT_DEBUG_MASK    (MWIFIEX_DBG_MSG | \
> >                     MWIFIEX_DBG_FATAL | \
> >                     MWIFIEX_DBG_ERROR)
> 
> Heh, makes more sense now :) But you still should improve the title and
> explain in the commit log that WARN level is not printed by default.
> 
> But before you submit v2 let's wait what Marvell says about this.
> 
> --
> Kalle Valo