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Sat, 3 Mar 2018 18:18:49 -0500 Received: from mail-cys01nam02on0114.outbound.protection.outlook.com ([104.47.37.114]:41081 "EHLO NAM02-CY1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934750AbeCCWiH (ORCPT ); Sat, 3 Mar 2018 17:38:07 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Mohammed Shafi Shajakhan , Kalle Valo , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 017/115] ath10k: disallow DFS simulation if DFS channel is not enabled Thread-Topic: [PATCH AUTOSEL for 4.4 017/115] ath10k: disallow DFS simulation if DFS channel is not enabled Thread-Index: AQHTsz9MsbeA5/Pm/0qqe1WnT0bAtQ== Date: Sat, 3 Mar 2018 22:30:57 +0000 Message-ID: <20180303223010.27106-17-alexander.levin@microsoft.com> References: <20180303223010.27106-1-alexander.levin@microsoft.com> In-Reply-To: <20180303223010.27106-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;MW2PR2101MB1067;7:9Co5d8YCbCQGre6LgFXwjTDdm/xeyknw7Xic8kLEQk3EV+vvBup6+O57Wz/azNolcnjHNGZHdWFX8FYfUgoajKSz573wNZPR3xccyqr7QaUEoOvCg/PVmOlKZWfcTrUhg8/jxgiT2gN7vy9u1zHk1WTDK7vkwV542Ra91rCv0jfCIzea7jeVkkqOjrv3Qj4SYgUjPspCusLk3dM0EzXLt2H6PT6e4f2baWfmj2UOH/6BNUb9Og8WJK2CDxsS3doy x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 0143a220-68d5-46d6-07d1-08d581576dc8 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(5600026)(4604075)(3008032)(2017052603307)(7193020);SRVR:MW2PR2101MB1067; 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x-microsoft-antispam-message-info: MvzV1LWzH7z+aAsWb54thpX//sYo9NWg8NWCDlYg3hx9hqybgfKOC5vNY7qpAWYr1Mfrmh3bGfPa72NZdUhHDneOiiDzKnZSQaFy/ZEC2Pj4UIJDqwiS9Vhr8+qGCgX9Kcc4sP3+5+NVYB1Tv1n0ZOTzJZci0ph5vErmFdMuoME= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0143a220-68d5-46d6-07d1-08d581576dc8 X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Mar 2018 22:30:57.3071 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW2PR2101MB1067 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Mohammed Shafi Shajakhan [ Upstream commit ca07baab0b1e627ae1d4a55d190fb1c9d32a3445 ] If DFS is not enabled in hostapd (ieee80211h=3D0) DFS channels shall not be available for use even though the hardware may have the capability to support DFS. With this configuration (DFS disabled in hostapd) trying to bring up ath10k device in DFS channel for AP mode fails and trying to simulate DFS in ath10k debugfs results in a warning in cfg80211 complaining invalid channel and this should be avoided in the driver itself rather than false propogating RADAR detection to mac80211/cfg80211. Fix this by checking for the first vif 'is_started' state(should work for client mode as well) as all the vifs shall be configured for the same channel sys/kernel/debug/ieee80211/phy1/ath10k# echo 1 > dfs_simulate_radar WARNING: at net/wireless/chan.c:265 cfg80211_radar_event+0x24/0x60 Workqueue: phy0 ieee80211_dfs_radar_detected_work [mac80211] [] (warn_slowpath_null) from [] (cfg80211_radar_event+0x24/0x60 [cfg80211]) [] (cfg80211_radar_event [cfg80211]) from [] (ieee80211_dfs_radar_detected_work+0x94/0xa0 [mac80211]) [] (ieee80211_dfs_radar_detected_work [mac80211]) from [] (process_one_work+0x20c/0x32c) WARNING: at net/wireless/nl80211.c:2488 nl80211_get_mpath+0x13c/0x4cc Workqueue: phy0 ieee80211_dfs_radar_detected_work [mac80211] [] (warn_slowpath_null) from [] (cfg80211_radar_event+0x24/0x60 [cfg80211]) [] (cfg80211_radar_event [cfg80211]) from [] (ieee80211_dfs_radar_detected_work+0x94/0xa0 [mac80211]) [] (ieee80211_dfs_radar_detected_work [mac80211]) from [] (process_one_work+0x20c/0x32c) Signed-off-by: Mohammed Shafi Shajakhan Signed-off-by: Kalle Valo Signed-off-by: Sasha Levin --- drivers/net/wireless/ath/ath10k/debug.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless= /ath/ath10k/debug.c index 1a88a24ffeac..30c357567054 100644 --- a/drivers/net/wireless/ath/ath10k/debug.c +++ b/drivers/net/wireless/ath/ath10k/debug.c @@ -1892,6 +1892,15 @@ static ssize_t ath10k_write_simulate_radar(struct fi= le *file, size_t count, loff_t *ppos) { struct ath10k *ar =3D file->private_data; + struct ath10k_vif *arvif; + + /* Just check for for the first vif alone, as all the vifs will be + * sharing the same channel and if the channel is disabled, all the + * vifs will share the same 'is_started' state. + */ + arvif =3D list_first_entry(&ar->arvifs, typeof(*arvif), list); + if (!arvif->is_started) + return -EINVAL; =20 ieee80211_radar_detected(ar->hw); =20 --=20 2.14.1