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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 2 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?IceSY7Sc1yRsNHGem6rkeqpcaEfQDD993TM/lb//0gFDVnP2K8UWOgLSVGBc?= =?us-ascii?Q?9bQMSQ6BVbN2/KX7lovJDfJgsaI8F/UxTGg8j2RiQLOIhRTbRrCshoFjy9JN?= =?us-ascii?Q?yyNXPVg+1XxB07YSvZisr7KB8I1IP9xJjiobgegE9Nk/ft3oG79mj++awr8g?= =?us-ascii?Q?WEC5dex94cacXyQ2i6WVXCp0+0LXoum7s6i2T+KCyj1ygJKnUVLV+FmTH6l0?= =?us-ascii?Q?Qtziv4x6JRPYe9ogEMDifyJ6C5HgCysIs4yp3FEuLu+9gik4kTOcQ5XQNoBq?= =?us-ascii?Q?qKyXaRkiJ99Wjghwf3HFNrCUzEOs6bPVUJmWSC+d6zOlXhvPgD75zPVcNeq6?= =?us-ascii?Q?6nNQDlvcku3HTs7wvQXIq5yM2lQKQHHD2g2R6H+xlXdwAMm5Q/3KI7t7AilZ?= =?us-ascii?Q?qk4z0RnrZGXlfrA2WwnPXK0stJLXn/eww0usv0j4190XaglHhU2YUl3YofRo?= =?us-ascii?Q?D6IlYZrjha0GtFG0iZJ19Wj6OUwfCRaKZceTf/7y3QTWe00sZSgbYgt/5LqM?= =?us-ascii?Q?upHGNjkIQqv82SMJS0qyqatrrsthKVhvKtcdntpuF16NMezna/aFnIPu7LjD?= =?us-ascii?Q?18gL0YPtar+1o3b/SFHfeovkUoqeSef6vkv8JpgRlX9cmhRMjfXNsVE6C3Ao?= =?us-ascii?Q?dpMao8W0meNcCnGy0hJQieKW1iKPSbUsUy4dU02IgPilCAybIaqAlLFZ2Zeh?= =?us-ascii?Q?bUyWu7KQ6ghxAtgTVQkaO5uZAsLDyRNKiAohS98t5RjfxZBS6BjcA6HGS4+t?= =?us-ascii?Q?PEd7WWAU/t/9348UOQya24CIY2LfAvd7OYhEpbWL+7cAOGENJr11hlu4k4vl?= =?us-ascii?Q?M+RzvyaYvrzygHV/XLXOdSV7lnvh0DdgRv3k/iBoGKEeki+IwVSC9HkzKfwM?= =?us-ascii?Q?G+aSHBihC272xZosjdDoGsfsaqIgD4KV51+OjCTPnMj1yJiX+rlgP2qTkvJ7?= =?us-ascii?Q?DBkO+BeXG3alWUrUKVEGvkCV2j5L0bWN6j6pXMAmGVw3IRdC2WzJ3u0xW46b?= =?us-ascii?Q?PoShkxVLNa2802TuTOfpXYvOEzaBkaTd95sPy1buAQnhjC/+QbSdrJNNFzoJ?= =?us-ascii?Q?MjrZ/qY/oi5s1iCZ/wgMHby6lEXdkyR3jYz0/IHh9KUTE3jDmnOG+IoEW0bB?= =?us-ascii?Q?H9kAtxtuCyHUc9TPJzL/oJxImLJP6gLvlBAZfaFItHGbJZbuoC8lo+NUAe7p?= =?us-ascii?Q?HNmjDB1NFTV8Ja19OVn7BN+Xnu1MVHvZHMRMzthr+5LRbW34Mfa42dDBNCMj?= =?us-ascii?Q?fKWkhjPpzrKM3Rsge+cYc3P4CkzuxZGOIosTOfN5uKTnMEmHRKMjss68xLQS?= =?us-ascii?Q?TK8LYI7Dfm2piEV5pZKKQBWYKDetdgnrQ0US1EmCYI9AWS8m1vcslNa2RjdY?= =?us-ascii?Q?v6xtPEZqNUDa0lM1pu6WvRxa5xo2MpNdWFqFoA3Ar07pxU6KhIfNms94QSUM?= =?us-ascii?Q?fyqci4xLPLFz5u0ViV/ysLxs+C25i5e2lNFC9BuY1uQ8oowibLA9fukXuZvC?= =?us-ascii?Q?5KZUqFjYMUevb8018UJfu7JnqA2BKFKdBfUIDFs6RShjcMteB/49SxW3nDSN?= =?us-ascii?Q?Bj8hJGa72CZjDdYv5TveCQL2kuiIHOVJOLJokMbMrw7xceiGZyfzoaFm/5KQ?= =?us-ascii?Q?J3NEOT6MhDWMgB/Bj3oaOKDlRUKbEBWdlSOlxsafDsR+ATlLuwYHl35+LUoY?= =?us-ascii?Q?qvO28iz9X+Rb8XGrtqA4VCdllTBffMeJXiJwx2zP6DF92jLYcIapDKWMVqVm?= =?us-ascii?Q?uHsPfijTW/mG1AZShUxp2cqI9CZoI0mJt2ltTrB+tveF7FHQo4JK8kt1pb8t?= X-MS-Exchange-AntiSpam-MessageData-1: 1QctVsG3W+FUFQ== X-OriginatorOrg: suse.com X-MS-Exchange-CrossTenant-Network-Message-Id: 00041672-e5e6-4b8d-7cfb-08da2cd79c90 X-MS-Exchange-CrossTenant-AuthSource: VI1PR0401MB2526.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 May 2022 07:36:18.5308 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: jGCe3RlxlEJMsm//cgGWoBg6AG/pkAZahSu/hX9rrjGTsBe4u+6GzBCopXGWa3SJLKnUxXcYsTBb3PJx/E916w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB6354 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On 02.05.22 21:32, Alan Stern wrote: Hi, I am happy to help, if I can. > The usbmon trace shows that quite a lot happens during re-enumeration=20 > that doesn't happen during the reset-resume. No doubt the reason for=20 > this is that the cdc-wdm driver doesn't have a real reset-resume=20 > handler; the operations it carries out for a reset-resume are the same=20 > as for a normal resume, and that clearly is not appropriate here. Doing reset_resume() for WDM is problematic. The whole point of WDM as a protocol is to put the configuration of a device into user space. What is a kernel driver to do in that case.? > For example, the usbmon trace shows that the kernel sends a=20 > Set-Interface request to the modem during re-enumeration and then does a= =20 > whole lot of probing that I don't understand. None of this stuff=20 > happens during the reset-resume. Probably the modem decides that=20 > without any of this extra configuration, it doesn't need to do=20 > anything -- and that's why it disconnects itself. > Are you sure that stuff comes from CDC-WDM in the case of reenumeration? WDM does not do set_interface() in any case. =C2=A0=C2=A0=C2=A0 Regards =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 Oliver