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From: Daniel Drake <>
To: Chris Chiu <>
Cc: Jes Sorensen <>,
	Kalle Valo <>,
	David Miller <>,
	linux-wireless <>,
	netdev <>,
	Linux Kernel <>,
	Linux Upstreaming Team <>,
	Larry Finger <>
Subject: Re: [RFC PATCH 2/2] rtl8xxxu: Add watchdog to update rate mask by signal strength
Date: Tue, 21 May 2019 12:38:22 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Fri, May 10, 2019 at 2:37 AM Chris Chiu <> wrote:
> I've verified that multiple virtual interface can not work simultaneously in
> STA mode. I assigned different mac address for different vifs, I can only
> bring only one interface up. If I want to bring the second vif up, it always
> complains "SIOCSIFFLAGS: Device or resource busy".

Interesting. Can you go deeper into that so that we can be more
confident of this limitation?

ieee80211_open() is the starting point.
ieee80211_check_concurrent_iface() is one candidate to generate -EBUSY
but from inspection, I don't think that's happening in this case,
perhaps you can keep following through in order to figure out which
part of the code is not allowing the 2nd STA interface to come up.


  reply	other threads:[~2019-05-21 18:38 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-03  7:21 [RFC PATCH 0/2] Improve TX performance of RTL8723BU on rtl8xxxu driver Chris Chiu
2019-05-03  7:21 ` [RFC PATCH 1/2] rtl8xxxu: Add rate adaptive related data Chris Chiu
2019-05-03  7:49   ` Kalle Valo
2019-05-09  8:11   ` Daniel Drake
2019-05-09  9:29     ` Joe Perches
2019-05-03  7:21 ` [RFC PATCH 2/2] rtl8xxxu: Add watchdog to update rate mask by signal strength Chris Chiu
2019-05-09  8:11   ` Daniel Drake
2019-05-09  9:17     ` Chris Chiu
2019-05-09 11:24       ` Daniel Drake
2019-05-10  8:36         ` Chris Chiu
2019-05-21 18:38           ` Daniel Drake [this message]
2019-05-27  6:38             ` Chris Chiu
2019-05-27 16:40               ` Daniel Drake

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