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Tue, 8 Sep 2026 20:33:52 +0000 Received: from OSZPR01MB9313.jpnprd01.prod.outlook.com ([fe80::90bf:9b82:54c3:1542]) by OSZPR01MB9313.jpnprd01.prod.outlook.com ([fe80::90bf:9b82:54c3:1542%4]) with mapi id 15.21.0406.005; Tue, 8 Sep 2026 20:33:52 +0000 From: Keisuke Tsukuda To: Greg Kroah-Hartman CC: Alan Stern , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "syzbot+a83a5a1ba9ff57935171@syzkaller.appspotmail.com" , "syzbot+d31109047baed8f3b590@syzkaller.appspotmail.com" , Keisuke Tsukuda Subject: [PATCH v2 0/2] usb: gadget: avoid warnings during configuration transitions Thread-Topic: [PATCH v2 0/2] usb: gadget: avoid warnings during configuration transitions Thread-Index: AQHdP9Fc4+KUIYz+SEyjvEMmaLeL3A== Date: Tue, 8 Sep 2026 20:33:52 +0000 Message-ID: <20260908203348.95825-1-tkdkei@outlook.jp> Accept-Language: en-US, ja-JP Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: OSZPR01MB9313:EE_|OSCPR01MB14838:EE_ x-ms-office365-filtering-correlation-id: 98e2c750-2c4a-4456-5120-08df0de87efb x-microsoft-antispam: BCL:0;ARA:14566002|19110799012|25031999004|8060799015|8062599012|15080799012|31061999003|38102599003|24021099003|12121999013|8022599003|25010399006|1602099012|10035399007|3071699003|2607281247196008|102099032|4302099013|3412199025|440099028|1710799026; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: OSZPR01MB9313.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: 98e2c750-2c4a-4456-5120-08df0de87efb X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Sep 2026 20:33:52.3465 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: OSCPR01MB14838 Rapidly alternating SET_CONFIGURATION requests can overtake the=0A= mass-storage function's asynchronous configuration work. This exposes two= =0A= states that are handled safely but currently produce kernel warnings: a=0A= delayed-status completion after reset_config() cleared its counter, and a= =0A= class request while common->fsg is not installed.=0A= =0A= The first patch keeps the obsolete completion as a dynamic-debug=0A= diagnostic. The second avoids the warning only in fsg_setup(), where the=0A= request is already rejected with -EOPNOTSUPP; warnings in other internal=0A= f_mass_storage paths remain unchanged.=0A= =0A= Both reports reproduce on an ARM64 Ubuntu 6.8 VM using dummy_hcd. With both= =0A= patches loaded, five 10-second, four-thread runs produced no WARNING, BUG,= =0A= or Oops. In a separate run, a kprobe observed five calls to=0A= usb_composite_setup_continue() with delayed_status =3D=3D 0 while the targe= t=0A= warning remained absent.=0A= =0A= syzbot tested the v1 code on usb-testing commit=0A= edc1518454f6439e50a9220e9a3ba09044ea8d8b and reported OK after a=0A= 50-minute run:=0A= =0A= https://syzkaller.appspot.com/bug?extid=3Da83a5a1ba9ff57935171=0A= =0A= Changes in v2:=0A= - Add a comment in fsg_setup() explaining why fsg_is_set() must not be=0A= used for this check, as requested by Alan Stern.=0A= - No executable code changes; patch 1 is unchanged.=0A= =0A= Keisuke Tsukuda (2):=0A= usb: gadget: composite: avoid warning on aborted delayed status=0A= usb: gadget: f_mass_storage: ignore class requests while inactive=0A= =0A= drivers/usb/gadget/composite.c | 2 +-=0A= drivers/usb/gadget/function/f_mass_storage.c | 7 ++++++-=0A= 2 files changed, 7 insertions(+), 2 deletions(-)=0A= =0A= -- =0A= 2.50.1 (Apple Git-155)=0A=