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From: "Alvin Šipraga" <alsi@bang-olufsen.dk>
To: Wen Gong <wgong@codeaurora.org>, kvalo@codeaurora.org
Cc: "Luis R . Rodriguez" <mcgrof@kernel.org>,
	linux-wireless@vger.kernel.org, ath10k@lists.infradead.org
Subject: Re: [PATCH] Revert "ath: add support for special 0x0 regulatory domain"
Date: Thu, 27 Aug 2020 09:59:20 +0200	[thread overview]
Message-ID: <c21bfe94-2de8-8178-7762-5a9b068a0e4a@bang-olufsen.dk> (raw)
In-Reply-To: <20200730124923.271429-1-alsi@bang-olufsen.dk>

Hi Kalle,

On 7/30/20 2:49 PM, Alvin Šipraga wrote:
> This reverts commit 2dc016599cfa9672a147528ca26d70c3654a5423.
> 
> Per Atheros documentation to manufacturers, the EEPROM regulatory domain
> code 0x0 must always map to "US". In particular, it should not map to a
> custom world regulatory domain. For references, see [1] and [2] below.
> Furthermore, __ath_regd_init() has a specific condition to set the
> country code to "US" in this case, which emits the following log
> message:
> 
> [    7.814307] ath: EEPROM indicates default country code should be used
> 
> The patch being reverted mistakenly maps 0x0 to the custom world
> regulatory domain 0x64 - the most restrictive of the world regulatory
> domains. The premise of the patch is that in the case of EEPROM
> regulatory domain code 0x0, ath_is_world_regd() should return true. But,
> as stated above, 0x0 should not map to a world regulatory domain, and so
> the function should return false. The original behaviour, whereby
> NL80211_REGDOM_SET_BY_COUNTRY_IE is ignored, was correct according to
> the manufacturer's intent and should not have been changed.
> 
> [1] https://wireless.wiki.kernel.org/en/users/drivers/ath#the_0x0_regulatory_domain
> [2] http://article.gmane.org/gmane.linux.kernel.wireless.general/38410
> 
> Fixes: 2dc016599cfa ("ath: add support for special 0x0 regulatory domain")
> Cc: Wen Gong <wgong@codeaurora.org>
> Cc: Luis R. Rodriguez <mcgrof@kernel.org>
> Cc: linux-wireless@vger.kernel.org
> Tested-on: QCA9880 hw2.0 PCI 10.2.4-1.0-00047
> Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk>
> ---
>   drivers/net/wireless/ath/regd.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
Do you have any feedback on this patch? No problem if you simply have 
not looked yet - I am not sure what kind of lead time to expect on the 
list. But without the patch, a (correctly) programmed 0x0 (US) card will 
not be able to operate on 5GHz channels without some hacking. I have 
cited some references to justify reverting this patch, so I would like 
to know if anything further should be done to get this into future kernels?

I wonder also if Wen Gong could comment, whose patch I am reverting in 
the first place. Maybe there is something I am missing?

Kind regards,
Alvin

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  reply	other threads:[~2020-08-27  7:59 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-30 12:49 [PATCH] Revert "ath: add support for special 0x0 regulatory domain" Alvin Šipraga
2020-08-27  7:59 ` Alvin Šipraga [this message]
2020-08-27 10:12   ` Kalle Valo
2020-08-27 10:25     ` Alvin Šipraga
  -- strict thread matches above, loose matches on Subject: below --
2020-12-21 12:15 sparks71
2020-10-22 17:21 Félix Sipma
     [not found] ` <CANe27jKpYm29QOjYOZ_jwHiRxuWx66J+th8-zgbXK4geiCU0_Q@mail.gmail.com>
2020-10-29 14:06   ` Félix Sipma
2020-10-30  7:20     ` Jouni Malinen
2020-10-30  8:51       ` Félix Sipma
2020-12-20  1:32         ` Julian Phillips
2020-10-30 13:23       ` Alvin Sipraga
2020-12-21 13:43         ` sparks71
2020-05-27 16:57 Brian Norris
2020-05-28 12:02 ` Julian Calaby
     [not found]   ` <CAJ-Vmomx0UFEa1w2HsGMQsZb+K8hyK=Zz9cKSo7tHv5GiMc1yw@mail.gmail.com>
2020-06-02 18:35     ` Brian Norris
2022-03-07 17:45 ` Kalle Valo
2022-04-23 10:52 ` Patrick Steinhardt
2022-04-25 18:54   ` Brian Norris
2022-05-09 18:16     ` Cale Collins
2022-05-11 22:52       ` Cale Collins
2022-08-30 21:56         ` Brian Norris
2022-09-19 17:24           ` Tim Harvey
2022-09-19 23:42             ` Sergey Ryazanov
2022-09-20  5:42               ` Sebastian Gottschall

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