[Bug 975] Power DOWN of copper interface not working in e1000 driver

[Bug 975] Power DOWN of copper interface not working in e1000 driver

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=975

            Bug ID: 975
           Summary: Power DOWN of copper interface not working in e1000
                    driver
           Product: DPDK
           Version: 22.03
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: tobias.karlsson@netscout.com
  Target Milestone: ---

A bug crept in via commit 44dddd14059f151f39f7e075b887decfc9a10f11

In function e1000_power_down_phy_copper_base()
  in file drivers/net/e1000/base/e1000_base.c

The following change is needed or the interface will not be brought down
properly:

-       if (phy->ops.check_reset_block(hw))
+       if (phy->ops.check_reset_block(hw) == E1000_SUCCESS)
                e1000_power_down_phy_copper(hw);

Please also update the comment above these code lines.

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