From: Johannes Berg <johannes@sipsolutions.net>
To: Arend van Spriel <arend.vanspriel@broadcom.com>
Cc: linux-wireless <linux-wireless@vger.kernel.org>,
Dmitry Shmidt <dimitrysh@google.com>
Subject: Re: [RFC] nl80211: allow multiple active scheduled scan requests
Date: Mon, 02 Jan 2017 11:44:01 +0100 [thread overview]
Message-ID: <1483353841.4596.2.camel@sipsolutions.net> (raw)
In-Reply-To: <1482315616-4721-1-git-send-email-arend.vanspriel@broadcom.com>
> + /*
> + * allow only one legacy scheduled scan if user-space
> + * does not indicate multiple scheduled scan support.
> + */
> + if (!info->attrs[NL80211_ATTR_SCHED_SCAN_MULTI] &&
> + cfg80211_legacy_sched_scan_active(rdev))
> return -EINPROGRESS;
That probably doesn't go far enough - if legacy one is active then we
probably shouldn't allow a new MULTI one either (or abandon the legacy
one) so that older userspace doesn't get confused with multiple
notifications from sched scans it didn't start.
> + if (rdev->sched_scan_req_count == rdev->wiphy.max_sched_scan_reqs)
> + return -ENOSPC;
Do we really want to do the double-accounting, just to avoid counting
the list length here?
> + /* leave request id zero for legacy request */
why? The ID would be ignored, so why special-case it?
> +static void cfg80211_del_sched_scan_req(struct
> cfg80211_registered_device *rdev,
> + struct
> cfg80211_sched_scan_request *req)
> +{
> + list_del_rcu(&req->list);
> + kfree_rcu(req, rcu_head);
> + synchronize_rcu();
> + rdev->sched_scan_req_count--;
> +}
That's bogus - either you use kfree_rcu() or synchronize_rcu() (the
former is much better); combining both makes no sense.
> +bool cfg80211_legacy_sched_scan_active(struct
> cfg80211_registered_device *rdev)
> +{
> + struct cfg80211_sched_scan_request *req;
> +
> + req = list_first_or_null_rcu(&rdev->sched_scan_req_list,
> + struct
> cfg80211_sched_scan_request, list);
> + /* request id 0 indicates legacy request in progress */
> + return req && !req->reqid;
> +}
Ok, fair enough.
johannes
next prev parent reply other threads:[~2017-01-02 10:44 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-16 22:47 [PATCH] RFC: Universal scan proposal dimitrysh
2016-11-17 20:56 ` Arend Van Spriel
2016-11-18 23:53 ` Dmitry Shmidt
2016-11-22 7:24 ` Luca Coelho
2016-11-22 17:29 ` Dmitry Shmidt
2016-11-22 20:41 ` Arend Van Spriel
2016-11-22 20:54 ` Dmitry Shmidt
2016-11-23 8:43 ` Arend Van Spriel
2016-11-28 19:25 ` Dmitry Shmidt
2016-12-05 14:28 ` Johannes Berg
2016-12-05 18:32 ` Dmitry Shmidt
2016-12-07 6:44 ` Johannes Berg
2016-12-07 18:39 ` Dmitry Shmidt
2016-12-07 20:51 ` Arend Van Spriel
2016-12-08 22:35 ` Dmitry Shmidt
2016-12-09 11:10 ` Arend Van Spriel
2016-12-13 16:06 ` Johannes Berg
2017-01-03 20:45 ` Dmitry Shmidt
2017-01-04 13:28 ` Johannes Berg
2017-01-04 20:32 ` Dmitry Shmidt
2017-01-05 11:46 ` Johannes Berg
2017-01-05 13:39 ` Arend Van Spriel
2017-01-05 13:44 ` Johannes Berg
2017-01-05 19:59 ` Arend Van Spriel
2017-01-09 10:48 ` Johannes Berg
2017-01-09 12:07 ` Arend Van Spriel
2017-01-11 13:14 ` Johannes Berg
2017-01-05 20:45 ` Dmitry Shmidt
2017-01-09 10:45 ` Johannes Berg
2017-01-09 11:19 ` Arend Van Spriel
2016-12-13 16:04 ` Johannes Berg
2016-12-21 10:20 ` [RFC] nl80211: allow multiple active scheduled scan requests Arend van Spriel
2017-01-02 10:44 ` Johannes Berg [this message]
2017-01-03 12:25 ` Arend Van Spriel
2017-01-04 9:59 ` Johannes Berg
2017-01-04 10:20 ` Arend Van Spriel
2017-01-04 10:30 ` Johannes Berg
2017-01-04 10:34 ` Arend Van Spriel
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