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net: usb: cdc_ncm: add Apple MacBook Pro USB product ID 0x1902

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The cdc_devs[] quirk table special-cases the Mac CDC-NCM private
interface personality only for USB product ID 0x1905.
Some MacBook Pro models (e.g. M1 Max) connected over a
USB4/Thunderbolt 3/4 cable to a host whose Thunderbolt controller
lacks PCIe tunneling support (no NHI function, USB4-only mode)
present themselves with product ID 0x1902 instead,
using the same descriptor layout as 0x1905: a Communications
control interface with zero endpoints (no interrupt/status endpoint)
paired with a CDC Data interface, at
interface numbers 0 and 2.

Because 0x1902 is unmatched, these devices fall through to the
generic cdc_ncm_info driver_info, which sets FLAG_LINK_INTR and
therefore requires an interrupt endpoint on the control interface.
Apple's private NCM interface never provides one, so cdc_ncm_bind()
fails outright:

  cdc_ncm 2-1:1.0: bind() failure
  cdc_ncm 2-1:1.2: bind() failure

and no network device is created, breaking Ethernet-over-USB4
between the Mac and any USB4 host lacking Thunderbolt PCIe
tunneling.

Add matching entries for 0x1902 alongside the existing 0x1905
ones, reusing apple_private_interface_info as with the other Mac
ID.

Signed-off-by: Mehrdad Afshari <mehrdad@signeen.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Mehrdad Afshari
2026-08-15 21:04:26 -07:00
committed by Jakub Kicinski
parent e264c04870
commit 746fc0787f
1 changed files with 6 additions and 0 deletions
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6
drivers/net/usb/cdc_ncm.c
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@@ -2013,6 +2013,12 @@ static const struct usb_device_id cdc_devs[] = {
},
/* Mac */
{ USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1902, 0),
.driver_info = (unsigned long)&apple_private_interface_info,
},
{ USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1902, 2),
.driver_info = (unsigned long)&apple_private_interface_info,
},
{ USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1905, 0),
.driver_info = (unsigned long)&apple_private_interface_info,
},