[Intel-wired-lan] Fw: [Bug 216261] New: Ethernet adapter i225_LM probe fail, return -1

[Intel-wired-lan] Fw: [Bug 216261] New: Ethernet adapter i225_LM probe fail, return -1

[Stephen Hemminger]

Begin forwarded message:

Date: Wed, 20 Jul 2022 01:19:08 +0000
From: bugzilla-daemon@kernel.org
To: stephen@networkplumber.org
Subject: [Bug 216261] New: Ethernet adapter i225_LM probe fail, return -1


https://bugzilla.kernel.org/show_bug.cgi?id=216261

            Bug ID: 216261
           Summary: Ethernet adapter i225_LM probe fail, return -1
           Product: Networking
           Version: 2.5
    Kernel Version: 5.4.y
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: IPV4
          Assignee: stephen@networkplumber.org
          Reporter: joseph.bao@intel.com
        Regression: No

Created attachment 301461
  --> https://bugzilla.kernel.org/attachment.cgi?id=301461&action=edit  
This patch is based on 5.4.206, fix the i225 probe issue caused by unnecessary
point check.

Running kernel 5.4 with intel CPU alderlake-s and Ethernet adapter i225-LM,
encounter probe failure, return err code -2. 

The root cause is that i225 devices have only one PHY vendor. There is no point
checking _I_PHY_ID during the link establishment and auto-negotiation process.

Refer to the link below.   

https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git/commit/drivers/net/ethernet/intel/igc?h=dev-queue&id=7c496de538eebd8212dc2a3c9a468386b264d0d4

Attach the patch to clean up these pointless checkings.

I tried another branch 5.15.y, it fixes this issue but has another issue
related to PCIe switch & nvme SSD, so I have to stay kernel 5.4.

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