一个 USB 端口已映射到我想要释放的中断......
cat /proc/interrupts | grep 16:
16: 31 0 0 0 0 0 0 0 IR-IO-APIC 16-fasteoi ehci_hcd:usb3
如何正确删除 ehci_hcd：usb3 设备？
root@blackserver:/sys/devices/pci0000:00/0000:00:1a.0/usb3# echo -n 1 > remove
出现错误“bash: echo: write error: Invalid param”，但 dmesg 输出显示“usb 3-1: USB disconnect, device number 2”，但设备仍在使用中断。这是错误还是我的方法错误？
编辑：
Bus 004 Device 002: ID 8087:8001 Intel Corp.
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 8087:8009 Intel Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 004: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 002 Device 003: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 002 Device 002: ID 174c:3074 ASMedia Technology Inc. ASM1074 SuperSpeed hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 051d:0002 American Power Conversion Uninterruptible Power Supply
Bus 001 Device 009: ID 045e:0745 Microsoft Corp. Nano Transceiver v1.0 for Bluetooth
Bus 001 Device 008: ID 046d:0826 Logitech, Inc. HD Webcam C525
Bus 001 Device 007: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 001 Device 006: ID 045e:02d1 Microsoft Corp. XBOX One Controller for Windows
Bus 001 Device 004: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 001 Device 003: ID 174c:2074 ASMedia Technology Inc. ASM1074 High-Speed hub
Bus 001 Device 002: ID 0b05:17cb ASUSTek Computer, Inc. Broadcom BCM20702A0 Bluetooth
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
编辑：所以我相信该设备本身是一个 ECHI 控制器，它被分配到总线 003 下。
kelvin@blackserver:~$ dmesg | grep :1a
[ 0.178287] pci 0000:00:1a.0: [8086:8cad] type 00 class 0x0c0320
[ 0.178310] pci 0000:00:1a.0: reg 0x10: [mem 0xefd3b000-0xefd3b3ff]
[ 0.178369] pci 0000:00:1a.0: PME# supported from D0 D3hot D3cold
[ 0.178403] pci 0000:00:1a.0: System wakeup disabled by ACPI
[ 0.675933] DMAR: Setting identity map for device 0000:00:1a.0 [0xade98000 - 0xadea6fff]
[ 0.676154] iommu: Adding device 0000:00:1a.0 to group 7
[ 0.837462] ehci-pci 0000:00:1a.0: EHCI Host Controller
[ 0.837481] ehci-pci 0000:00:1a.0: new USB bus registered, assigned bus number 3
[ 0.837509] ehci-pci 0000:00:1a.0: debug port 2
[ 0.842160] ehci-pci 0000:00:1a.0: cache line size of 64 is not supported
[ 0.842174] ehci-pci 0000:00:1a.0: irq 16, io mem 0xefd3b000
[ 0.853306] ehci-pci 0000:00:1a.0: USB 2.0 started, EHCI 1.00
[ 0.857162] usb usb3: SerialNumber: 0000:00:1a.0
已解决：将命令移回上一级......
root@blackserver:/sys/devices/pci0000:00/0000:00:1a.0# echo -n 1 > remove
dmesg 现在输出...
[65207.355668] ehci-pci 0000:00:1a.0: remove, state 4
[65207.355680] usb usb3: USB disconnect, device number 1
[65207.355682] usb 3-1: USB disconnect, device number 2
[65207.360110] ehci-pci 0000:00:1a.0: USB bus 3 deregistered
[65207.475341] iommu: Removing device 0000:00:1a.0 from group 7
没有其他错误消息，并且 USB 控制器不再列在 lspci 中或 lsusb 中显示的设备中。
答案1
已解决：将命令移回上一级......
root@blackserver:/sys/devices/pci0000:00/0000:00:1a.0# echo -n 1 > remove
dmesg 现在输出...
[65207.355668] ehci-pci 0000:00:1a.0: remove, state 4
[65207.355680] usb usb3: USB disconnect, device number 1
[65207.355682] usb 3-1: USB disconnect, device number 2
[65207.360110] ehci-pci 0000:00:1a.0: USB bus 3 deregistered
[65207.475341] iommu: Removing device 0000:00:1a.0 from group 7
没有其他错误消息，并且 USB 控制器不再列在 lspci 中或 lsusb 中显示的设备中。