On Thu, Jun 20, 2024 at 8:06 AM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > On Thu, Jun 20, 2024 at 07:58:13AM +0200, Giacinto Cifelli wrote: > > greetings, > > > > question: > > > > on a system (yocto), I have a usb composition that doesn't assign the > > class for the interfaces: > > |__ Port 3: Dev 3, If 10, Class=, Driver=cdc_mbim, 480M > > |__ Port 3: Dev 3, If 8, Class=, Driver=cdc_acm, 480M > > |__ Port 3: Dev 3, If 6, Class=, Driver=cdc_acm, 480M > > |__ Port 3: Dev 3, If 4, Class=, Driver=cdc_acm, 480M > > |__ Port 3: Dev 3, If 2, Class=, Driver=cdc_acm, 480M > > |__ Port 3: Dev 3, If 11, Class=, Driver=cdc_mbim, 480M > > |__ Port 3: Dev 3, If 0, Class=, Driver=cdc_acm, 480M > > |__ Port 3: Dev 3, If 9, Class=, Driver=cdc_acm, 480M > > |__ Port 3: Dev 3, If 7, Class=, Driver=cdc_acm, 480M > > |__ Port 3: Dev 3, If 5, Class=, Driver=cdc_acm, 480M > > |__ Port 3: Dev 3, If 3, Class=, Driver=cdc_acm, 480M > > |__ Port 3: Dev 3, If 1, Class=, Driver=cdc_acm, 480M > > Kernel: Linux version 6.1.35 (oe-user@oe-host) (x86_64-poky-linux-gcc > > (GCC) 11.4.0, GNU ld (GNU Binutils) 2.38.20220708) #1 SMP > > PREEMPT_DYNAMIC Thu Jun 22 18:03:13 UTC 2023 > > > > instead of (arch): > > |__ Port 004: Dev 004, If 0, Class=Communications, Driver=cdc_acm, 5000M > > |__ Port 004: Dev 004, If 1, Class=CDC Data, Driver=cdc_acm, 5000M > > |__ Port 004: Dev 004, If 2, Class=Communications, Driver=cdc_acm, 5000M > > |__ Port 004: Dev 004, If 3, Class=CDC Data, Driver=cdc_acm, 5000M > > |__ Port 004: Dev 004, If 4, Class=Communications, Driver=cdc_acm, 5000M > > |__ Port 004: Dev 004, If 5, Class=CDC Data, Driver=cdc_acm, 5000M > > |__ Port 004: Dev 004, If 6, Class=Communications, Driver=cdc_acm, 5000M > > |__ Port 004: Dev 004, If 7, Class=CDC Data, Driver=cdc_acm, 5000M > > |__ Port 004: Dev 004, If 8, Class=Communications, Driver=cdc_acm, 5000M > > |__ Port 004: Dev 004, If 9, Class=CDC Data, Driver=cdc_acm, 5000M > > |__ Port 004: Dev 004, If 10, Class=Communications, Driver=cdc_mbim, 5000M > > |__ Port 004: Dev 004, If 11, Class=CDC Data, Driver=cdc_mbim, 5000M > > Kernel: Linux 6.6.34-1-lts #1 SMP PREEMPT_DYNAMIC Sun, 16 Jun 2024 > > 14:45:31 +0000 x86_64 GNU/Linux > > > > This lack of class creates too many /dev/ttyACMx ports, and > > ModemManager tries to access them all, perhaps also blocking the > > device, and the whole system doesn't work. > > > > For completeness, the device is: > > Bus 002 Device 004: ID 1e2d:0065 Gemalto M2M GmbH LTE Modem > > which is supported without any customs in the cdc-acm and cdc_mbim drivers. > > > > I spotted only two options not compiled-in in the yocto .config > > (compared with the arch one), but I strongly doubt this is related: > > CONFIG_USB_G_MULTI > > CONFIG_USB_G_MULTI_CDC > > > > Would you know why the class is not assigned? > > This is just a userspace issue, right? I think the class is assigned by the kernel/driver. > Or are you saying that somehow > the same device plugged into two different systems works differently? correct: the same device works differently in the two systems... in the sense of the class not assigned. The device boots in the same way, the difference is not in the device. > > Note that 6.6 is a year older than 6.1 so perhaps you just need to > update your system running 6.1? Odds are there's a quirk for this > device in newer kernels. I have checked, and there aren't for this device, which was working properly already with the kernels 4.19.x. I haven't submitted any for this modem, but if it turns out that patches are needed, I will be glad to submit them. Only at the moment I have no idea about what is going wrong. > > Also, 6.1.35 is VERY old and obsolete and full of known security holes > that have been fixed. Please update to the latest 6.1.y release as soon > as possible. I think in Yocto they have the habit of adding patches without changing the version number. But in any case I will start to migrate the system... it will take some time, thou. I feel, however, that this won't solve the issue at hand. Any idea why the class is not assigned? > > thanks, > > greg k-h Kind Regards, Giacinto
