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udev: Issue with a rule for a PCIe 4G network device

Change value of USB “max_sectors” for an entire family of devicesudev, how to prevent further rules to be run?Attributes from various parent devices in a udev ruleWrite udev rule from bitbake recipePersistent names for physical USB ports

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The goal of my rule is having the network interface renamed from "eth0" (or whatever) to "gsm0" and to create a symlink /dev/ATCMD to /dev/ttyUSBX depending on the device we use to issue the AT commands.

I made this rule :

SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}!="02", GOTO="symlink_huaweiME909_end"

SUBSYSTEMS=="usb", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", SYMLINK+="ATCMD"

LABEL="symlink_huaweiME909_end"

SUBSYSTEM=="net", ACTION=="add", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", NAME="gsm0"

The renaming of the interface works great but for the symlink part, it's only working at boot. If I manually bring down the gsm0 interface and bring it up again, the symlink is not redirected to /dev/ttyUSBX anymore. It goes from :

lrwxrwxrwx  1 root root           7 Jan  1  1970 ATCMD -> ttyUSB0

to :

lrwxrwxrwx  1 root root          15 Aug 14 11:03 ATCMD -> bus/usb/001/006

The command udevadm info -a -p $(udevadm info -q path -n /dev/ttyUSB0) gives me :

  looking at device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2/ttyUSB0/tty/ttyUSB0':

    KERNEL=="ttyUSB0"

    SUBSYSTEM=="tty"

    DRIVER==""



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2/ttyUSB0':

    KERNELS=="ttyUSB0"

    SUBSYSTEMS=="usb-serial"

    DRIVERS=="option1"

    ATTRS{port_number}=="0"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2':

    KERNELS=="1-1:2.2"

    SUBSYSTEMS=="usb"

    DRIVERS=="option"

    ATTRS{interface}=="Huawei Mobile Connect - Modem"

    ATTRS{bInterfaceProtocol}=="10"

    ATTRS{bInterfaceNumber}=="02"

    ATTRS{bInterfaceSubClass}=="06"

    ATTRS{bInterfaceClass}=="ff"

    ATTRS{bAlternateSetting}==" 0"

    ATTRS{authorized}=="1"

    ATTRS{bNumEndpoints}=="03"

    ATTRS{supports_autosuspend}=="1"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1':

    KERNELS=="1-1"

    SUBSYSTEMS=="usb"

    DRIVERS=="usb"

    ATTRS{bDeviceClass}=="00"

    ATTRS{rx_lanes}=="1"

    ATTRS{manufacturer}=="Huawei Technologies Co., Ltd."

    ATTRS{bmAttributes}=="a0"

    ATTRS{bConfigurationValue}=="2"

    ATTRS{version}==" 2.00"

    ATTRS{devnum}=="2"

    ATTRS{bMaxPower}=="2mA"

    ATTRS{idProduct}=="15c1"

    ATTRS{avoid_reset_quirk}=="0"

    ATTRS{urbnum}=="953"

    ATTRS{bDeviceSubClass}=="00"

    ATTRS{maxchild}=="0"

    ATTRS{bcdDevice}=="0102"

    ATTRS{bMaxPacketSize0}=="64"

    ATTRS{idVendor}=="12d1"

    ATTRS{product}=="HUAWEI Mobile V7R11"

    ATTRS{speed}=="480"

    ATTRS{removable}=="unknown"

    ATTRS{ltm_capable}=="no"

    ATTRS{serial}=="0123456789ABCDEF"

    ATTRS{bNumConfigurations}=="3"

    ATTRS{busnum}=="1"

    ATTRS{authorized}=="1"

    ATTRS{tx_lanes}=="1"

    ATTRS{quirks}=="0x0"

    ATTRS{configuration}==""

    ATTRS{devpath}=="1"

    ATTRS{bDeviceProtocol}=="ff"

    ATTRS{bNumInterfaces}==" 7"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1':

    KERNELS=="usb1"

    SUBSYSTEMS=="usb"

    DRIVERS=="usb"

    ATTRS{bDeviceClass}=="09"

    ATTRS{rx_lanes}=="1"

    ATTRS{manufacturer}=="Linux 4.19.57 dwc_otg_hcd"

    ATTRS{bmAttributes}=="e0"

    ATTRS{bConfigurationValue}=="1"

    ATTRS{version}==" 2.00"

    ATTRS{devnum}=="1"

    ATTRS{bMaxPower}=="0mA"

    ATTRS{idProduct}=="0002"

    ATTRS{avoid_reset_quirk}=="0"

    ATTRS{urbnum}=="25"

    ATTRS{bDeviceSubClass}=="00"

    ATTRS{maxchild}=="1"

    ATTRS{bcdDevice}=="0419"

    ATTRS{bMaxPacketSize0}=="64"

    ATTRS{idVendor}=="1d6b"

    ATTRS{product}=="DWC OTG Controller"

    ATTRS{speed}=="480"

    ATTRS{authorized_default}=="1"

    ATTRS{interface_authorized_default}=="1"

    ATTRS{removable}=="unknown"

    ATTRS{ltm_capable}=="no"

    ATTRS{serial}=="3f980000.usb"

    ATTRS{bNumConfigurations}=="1"

    ATTRS{busnum}=="1"

    ATTRS{authorized}=="1"

    ATTRS{tx_lanes}=="1"

    ATTRS{quirks}=="0x0"

    ATTRS{configuration}==""

    ATTRS{devpath}=="0"

    ATTRS{bDeviceProtocol}=="01"

    ATTRS{bNumInterfaces}==" 1"

and some more things after this.

Thank you for your help!

EDIT1: This rule works perfectly on kernel 4.1 but has this issue on 4.19

"SOLUTION":
I reworked my rule as follow and it's working better. I still have some minor issues when I bring down the gsm0 interface.

SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}!="02", GOTO="symlink_huaweiME909_end"

SUBSYSTEM=="tty", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", SYMLINK+="ATCMD"

LABEL="symlink_huaweiME909_end"

SUBSYSTEM=="net", ACTION=="add", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", NAME="gsm0"

edited yesterday

asked yesterday

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New contributor

add a comment |

I made this rule :

SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}!="02", GOTO="symlink_huaweiME909_end"

SUBSYSTEMS=="usb", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", SYMLINK+="ATCMD"

LABEL="symlink_huaweiME909_end"

SUBSYSTEM=="net", ACTION=="add", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", NAME="gsm0"

lrwxrwxrwx  1 root root           7 Jan  1  1970 ATCMD -> ttyUSB0

to :

lrwxrwxrwx  1 root root          15 Aug 14 11:03 ATCMD -> bus/usb/001/006

The command udevadm info -a -p $(udevadm info -q path -n /dev/ttyUSB0) gives me :

  looking at device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2/ttyUSB0/tty/ttyUSB0':

    KERNEL=="ttyUSB0"

    SUBSYSTEM=="tty"

    DRIVER==""



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2/ttyUSB0':

    KERNELS=="ttyUSB0"

    SUBSYSTEMS=="usb-serial"

    DRIVERS=="option1"

    ATTRS{port_number}=="0"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2':

    KERNELS=="1-1:2.2"

    SUBSYSTEMS=="usb"

    DRIVERS=="option"

    ATTRS{interface}=="Huawei Mobile Connect - Modem"

    ATTRS{bInterfaceProtocol}=="10"

    ATTRS{bInterfaceNumber}=="02"

    ATTRS{bInterfaceSubClass}=="06"

    ATTRS{bInterfaceClass}=="ff"

    ATTRS{bAlternateSetting}==" 0"

    ATTRS{authorized}=="1"

    ATTRS{bNumEndpoints}=="03"

    ATTRS{supports_autosuspend}=="1"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1':

    KERNELS=="1-1"

    SUBSYSTEMS=="usb"

    DRIVERS=="usb"

    ATTRS{bDeviceClass}=="00"

    ATTRS{rx_lanes}=="1"

    ATTRS{manufacturer}=="Huawei Technologies Co., Ltd."

    ATTRS{bmAttributes}=="a0"

    ATTRS{bConfigurationValue}=="2"

    ATTRS{version}==" 2.00"

    ATTRS{devnum}=="2"

    ATTRS{bMaxPower}=="2mA"

    ATTRS{idProduct}=="15c1"

    ATTRS{avoid_reset_quirk}=="0"

    ATTRS{urbnum}=="953"

    ATTRS{bDeviceSubClass}=="00"

    ATTRS{maxchild}=="0"

    ATTRS{bcdDevice}=="0102"

    ATTRS{bMaxPacketSize0}=="64"

    ATTRS{idVendor}=="12d1"

    ATTRS{product}=="HUAWEI Mobile V7R11"

    ATTRS{speed}=="480"

    ATTRS{removable}=="unknown"

    ATTRS{ltm_capable}=="no"

    ATTRS{serial}=="0123456789ABCDEF"

    ATTRS{bNumConfigurations}=="3"

    ATTRS{busnum}=="1"

    ATTRS{authorized}=="1"

    ATTRS{tx_lanes}=="1"

    ATTRS{quirks}=="0x0"

    ATTRS{configuration}==""

    ATTRS{devpath}=="1"

    ATTRS{bDeviceProtocol}=="ff"

    ATTRS{bNumInterfaces}==" 7"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1':

    KERNELS=="usb1"

    SUBSYSTEMS=="usb"

    DRIVERS=="usb"

    ATTRS{bDeviceClass}=="09"

    ATTRS{rx_lanes}=="1"

    ATTRS{manufacturer}=="Linux 4.19.57 dwc_otg_hcd"

    ATTRS{bmAttributes}=="e0"

    ATTRS{bConfigurationValue}=="1"

    ATTRS{version}==" 2.00"

    ATTRS{devnum}=="1"

    ATTRS{bMaxPower}=="0mA"

    ATTRS{idProduct}=="0002"

    ATTRS{avoid_reset_quirk}=="0"

    ATTRS{urbnum}=="25"

    ATTRS{bDeviceSubClass}=="00"

    ATTRS{maxchild}=="1"

    ATTRS{bcdDevice}=="0419"

    ATTRS{bMaxPacketSize0}=="64"

    ATTRS{idVendor}=="1d6b"

    ATTRS{product}=="DWC OTG Controller"

    ATTRS{speed}=="480"

    ATTRS{authorized_default}=="1"

    ATTRS{interface_authorized_default}=="1"

    ATTRS{removable}=="unknown"

    ATTRS{ltm_capable}=="no"

    ATTRS{serial}=="3f980000.usb"

    ATTRS{bNumConfigurations}=="1"

    ATTRS{busnum}=="1"

    ATTRS{authorized}=="1"

    ATTRS{tx_lanes}=="1"

    ATTRS{quirks}=="0x0"

    ATTRS{configuration}==""

    ATTRS{devpath}=="0"

    ATTRS{bDeviceProtocol}=="01"

    ATTRS{bNumInterfaces}==" 1"

and some more things after this.

Thank you for your help!

EDIT1: This rule works perfectly on kernel 4.1 but has this issue on 4.19

"SOLUTION":
I reworked my rule as follow and it's working better. I still have some minor issues when I bring down the gsm0 interface.

SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}!="02", GOTO="symlink_huaweiME909_end"

SUBSYSTEM=="tty", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", SYMLINK+="ATCMD"

LABEL="symlink_huaweiME909_end"

SUBSYSTEM=="net", ACTION=="add", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", NAME="gsm0"

edited yesterday

asked yesterday

Carton_

62 bronze badges

New contributor

add a comment |

I made this rule :

SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}!="02", GOTO="symlink_huaweiME909_end"

SUBSYSTEMS=="usb", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", SYMLINK+="ATCMD"

LABEL="symlink_huaweiME909_end"

SUBSYSTEM=="net", ACTION=="add", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", NAME="gsm0"

lrwxrwxrwx  1 root root           7 Jan  1  1970 ATCMD -> ttyUSB0

to :

lrwxrwxrwx  1 root root          15 Aug 14 11:03 ATCMD -> bus/usb/001/006

The command udevadm info -a -p $(udevadm info -q path -n /dev/ttyUSB0) gives me :

  looking at device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2/ttyUSB0/tty/ttyUSB0':

    KERNEL=="ttyUSB0"

    SUBSYSTEM=="tty"

    DRIVER==""



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2/ttyUSB0':

    KERNELS=="ttyUSB0"

    SUBSYSTEMS=="usb-serial"

    DRIVERS=="option1"

    ATTRS{port_number}=="0"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2':

    KERNELS=="1-1:2.2"

    SUBSYSTEMS=="usb"

    DRIVERS=="option"

    ATTRS{interface}=="Huawei Mobile Connect - Modem"

    ATTRS{bInterfaceProtocol}=="10"

    ATTRS{bInterfaceNumber}=="02"

    ATTRS{bInterfaceSubClass}=="06"

    ATTRS{bInterfaceClass}=="ff"

    ATTRS{bAlternateSetting}==" 0"

    ATTRS{authorized}=="1"

    ATTRS{bNumEndpoints}=="03"

    ATTRS{supports_autosuspend}=="1"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1':

    KERNELS=="1-1"

    SUBSYSTEMS=="usb"

    DRIVERS=="usb"

    ATTRS{bDeviceClass}=="00"

    ATTRS{rx_lanes}=="1"

    ATTRS{manufacturer}=="Huawei Technologies Co., Ltd."

    ATTRS{bmAttributes}=="a0"

    ATTRS{bConfigurationValue}=="2"

    ATTRS{version}==" 2.00"

    ATTRS{devnum}=="2"

    ATTRS{bMaxPower}=="2mA"

    ATTRS{idProduct}=="15c1"

    ATTRS{avoid_reset_quirk}=="0"

    ATTRS{urbnum}=="953"

    ATTRS{bDeviceSubClass}=="00"

    ATTRS{maxchild}=="0"

    ATTRS{bcdDevice}=="0102"

    ATTRS{bMaxPacketSize0}=="64"

    ATTRS{idVendor}=="12d1"

    ATTRS{product}=="HUAWEI Mobile V7R11"

    ATTRS{speed}=="480"

    ATTRS{removable}=="unknown"

    ATTRS{ltm_capable}=="no"

    ATTRS{serial}=="0123456789ABCDEF"

    ATTRS{bNumConfigurations}=="3"

    ATTRS{busnum}=="1"

    ATTRS{authorized}=="1"

    ATTRS{tx_lanes}=="1"

    ATTRS{quirks}=="0x0"

    ATTRS{configuration}==""

    ATTRS{devpath}=="1"

    ATTRS{bDeviceProtocol}=="ff"

    ATTRS{bNumInterfaces}==" 7"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1':

    KERNELS=="usb1"

    SUBSYSTEMS=="usb"

    DRIVERS=="usb"

    ATTRS{bDeviceClass}=="09"

    ATTRS{rx_lanes}=="1"

    ATTRS{manufacturer}=="Linux 4.19.57 dwc_otg_hcd"

    ATTRS{bmAttributes}=="e0"

    ATTRS{bConfigurationValue}=="1"

    ATTRS{version}==" 2.00"

    ATTRS{devnum}=="1"

    ATTRS{bMaxPower}=="0mA"

    ATTRS{idProduct}=="0002"

    ATTRS{avoid_reset_quirk}=="0"

    ATTRS{urbnum}=="25"

    ATTRS{bDeviceSubClass}=="00"

    ATTRS{maxchild}=="1"

    ATTRS{bcdDevice}=="0419"

    ATTRS{bMaxPacketSize0}=="64"

    ATTRS{idVendor}=="1d6b"

    ATTRS{product}=="DWC OTG Controller"

    ATTRS{speed}=="480"

    ATTRS{authorized_default}=="1"

    ATTRS{interface_authorized_default}=="1"

    ATTRS{removable}=="unknown"

    ATTRS{ltm_capable}=="no"

    ATTRS{serial}=="3f980000.usb"

    ATTRS{bNumConfigurations}=="1"

    ATTRS{busnum}=="1"

    ATTRS{authorized}=="1"

    ATTRS{tx_lanes}=="1"

    ATTRS{quirks}=="0x0"

    ATTRS{configuration}==""

    ATTRS{devpath}=="0"

    ATTRS{bDeviceProtocol}=="01"

    ATTRS{bNumInterfaces}==" 1"

and some more things after this.

Thank you for your help!

EDIT1: This rule works perfectly on kernel 4.1 but has this issue on 4.19

"SOLUTION":
I reworked my rule as follow and it's working better. I still have some minor issues when I bring down the gsm0 interface.

SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}!="02", GOTO="symlink_huaweiME909_end"

SUBSYSTEM=="tty", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", SYMLINK+="ATCMD"

LABEL="symlink_huaweiME909_end"

SUBSYSTEM=="net", ACTION=="add", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", NAME="gsm0"

edited yesterday

asked yesterday

Carton_

62 bronze badges

New contributor

I made this rule :

SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}!="02", GOTO="symlink_huaweiME909_end"

SUBSYSTEMS=="usb", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", SYMLINK+="ATCMD"

LABEL="symlink_huaweiME909_end"

SUBSYSTEM=="net", ACTION=="add", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", NAME="gsm0"

lrwxrwxrwx  1 root root           7 Jan  1  1970 ATCMD -> ttyUSB0

to :

lrwxrwxrwx  1 root root          15 Aug 14 11:03 ATCMD -> bus/usb/001/006

The command udevadm info -a -p $(udevadm info -q path -n /dev/ttyUSB0) gives me :

  looking at device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2/ttyUSB0/tty/ttyUSB0':

    KERNEL=="ttyUSB0"

    SUBSYSTEM=="tty"

    DRIVER==""



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2/ttyUSB0':

    KERNELS=="ttyUSB0"

    SUBSYSTEMS=="usb-serial"

    DRIVERS=="option1"

    ATTRS{port_number}=="0"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1:2.2':

    KERNELS=="1-1:2.2"

    SUBSYSTEMS=="usb"

    DRIVERS=="option"

    ATTRS{interface}=="Huawei Mobile Connect - Modem"

    ATTRS{bInterfaceProtocol}=="10"

    ATTRS{bInterfaceNumber}=="02"

    ATTRS{bInterfaceSubClass}=="06"

    ATTRS{bInterfaceClass}=="ff"

    ATTRS{bAlternateSetting}==" 0"

    ATTRS{authorized}=="1"

    ATTRS{bNumEndpoints}=="03"

    ATTRS{supports_autosuspend}=="1"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1':

    KERNELS=="1-1"

    SUBSYSTEMS=="usb"

    DRIVERS=="usb"

    ATTRS{bDeviceClass}=="00"

    ATTRS{rx_lanes}=="1"

    ATTRS{manufacturer}=="Huawei Technologies Co., Ltd."

    ATTRS{bmAttributes}=="a0"

    ATTRS{bConfigurationValue}=="2"

    ATTRS{version}==" 2.00"

    ATTRS{devnum}=="2"

    ATTRS{bMaxPower}=="2mA"

    ATTRS{idProduct}=="15c1"

    ATTRS{avoid_reset_quirk}=="0"

    ATTRS{urbnum}=="953"

    ATTRS{bDeviceSubClass}=="00"

    ATTRS{maxchild}=="0"

    ATTRS{bcdDevice}=="0102"

    ATTRS{bMaxPacketSize0}=="64"

    ATTRS{idVendor}=="12d1"

    ATTRS{product}=="HUAWEI Mobile V7R11"

    ATTRS{speed}=="480"

    ATTRS{removable}=="unknown"

    ATTRS{ltm_capable}=="no"

    ATTRS{serial}=="0123456789ABCDEF"

    ATTRS{bNumConfigurations}=="3"

    ATTRS{busnum}=="1"

    ATTRS{authorized}=="1"

    ATTRS{tx_lanes}=="1"

    ATTRS{quirks}=="0x0"

    ATTRS{configuration}==""

    ATTRS{devpath}=="1"

    ATTRS{bDeviceProtocol}=="ff"

    ATTRS{bNumInterfaces}==" 7"



  looking at parent device '/devices/platform/soc/3f980000.usb/usb1':

    KERNELS=="usb1"

    SUBSYSTEMS=="usb"

    DRIVERS=="usb"

    ATTRS{bDeviceClass}=="09"

    ATTRS{rx_lanes}=="1"

    ATTRS{manufacturer}=="Linux 4.19.57 dwc_otg_hcd"

    ATTRS{bmAttributes}=="e0"

    ATTRS{bConfigurationValue}=="1"

    ATTRS{version}==" 2.00"

    ATTRS{devnum}=="1"

    ATTRS{bMaxPower}=="0mA"

    ATTRS{idProduct}=="0002"

    ATTRS{avoid_reset_quirk}=="0"

    ATTRS{urbnum}=="25"

    ATTRS{bDeviceSubClass}=="00"

    ATTRS{maxchild}=="1"

    ATTRS{bcdDevice}=="0419"

    ATTRS{bMaxPacketSize0}=="64"

    ATTRS{idVendor}=="1d6b"

    ATTRS{product}=="DWC OTG Controller"

    ATTRS{speed}=="480"

    ATTRS{authorized_default}=="1"

    ATTRS{interface_authorized_default}=="1"

    ATTRS{removable}=="unknown"

    ATTRS{ltm_capable}=="no"

    ATTRS{serial}=="3f980000.usb"

    ATTRS{bNumConfigurations}=="1"

    ATTRS{busnum}=="1"

    ATTRS{authorized}=="1"

    ATTRS{tx_lanes}=="1"

    ATTRS{quirks}=="0x0"

    ATTRS{configuration}==""

    ATTRS{devpath}=="0"

    ATTRS{bDeviceProtocol}=="01"

    ATTRS{bNumInterfaces}==" 1"

and some more things after this.

Thank you for your help!

EDIT1: This rule works perfectly on kernel 4.1 but has this issue on 4.19

"SOLUTION":
I reworked my rule as follow and it's working better. I still have some minor issues when I bring down the gsm0 interface.

SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}!="02", GOTO="symlink_huaweiME909_end"

SUBSYSTEM=="tty", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", SYMLINK+="ATCMD"

LABEL="symlink_huaweiME909_end"

SUBSYSTEM=="net", ACTION=="add", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="15c1", NAME="gsm0"

udev yocto

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