Linux wireless drivers development
 help / color / mirror / Atom feed
From: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
To: "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Cc: Igor Mitsyanko <igor.mitsyanko.os@quantenna.com>
Subject: question: crda timeout in cfg80211
Date: Tue, 26 Mar 2019 12:42:15 +0000	[thread overview]
Message-ID: <20190326124209.j6tdk5cz47kc6mdj@bars> (raw)

Hi all,

Linux cfg80211 regulatory subsystem uses CRDA timeout to ensure completion
of regulatory updates, performed by user-space software. See call_crda
functon in net/wireless/reg.c:

static int call_crda(const char *alpha2)
{
	...

	queue_delayed_work(system_power_efficient_wq,
			&crda_timeout, msecs_to_jiffies(3142));
	return 0;
}

So regulatory update/reset operations shall be completed in 3142 msec.
And that includes processing of regulatory notifiers for all the
wireless cards in the system.

It is not quite clear where this specific timeout value came from.
Original commit (a90c7a313a1c5b) doesn't go into details about it.

Any ideas where it could come from ?

Regards,
Sergey

             reply	other threads:[~2019-03-26 12:43 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-26 12:42 Sergey Matyukevich [this message]
2019-04-08 19:06 ` question: crda timeout in cfg80211 Johannes Berg
2019-04-09  8:35   ` Sergey Matyukevich
2019-04-09  8:40     ` Johannes Berg
2019-04-11 12:40       ` Sergey Matyukevich
2019-04-23 12:31         ` Johannes Berg

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190326124209.j6tdk5cz47kc6mdj@bars \
    --to=sergey.matyukevich.os@quantenna.com \
    --cc=igor.mitsyanko.os@quantenna.com \
    --cc=linux-wireless@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox