Differential D47293

igc: Fix a bogus register write in igc_if_queues_free()
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Authored by markj on Oct 26 2024, 5:22 PM.

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rG57d879534096: igc: Remove a bogus register write in igc_if_queues_free()
rG16b24ba87227: igc: Remove a bogus register write in igc_if_queues_free()
rG35d05a14ed7e: igc: Remove a bogus register write in igc_if_queues_free()

Summary

As explained in PR 277038, iflib calls IFDI_DETACH() and then
IFDI_QUEUES_FREE(). With igc, the latter writes to a register after it
has been unmapped.

igc_if_detach() already calls igc_release_hw_control(), and looking at
callers of igc_if_queues_free(), that appears to be sufficient. So,
just remove the igc_release_hw_control() call.

PR: 277038
Diagnosed by: Mike Belanger <mibelanger@qnx.com>

Test Plan

I have no igc hardware and can't test this, any testing would be appreciated.

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rG FreeBSD src repository

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Event Timeline

markj created this revision.Oct 26 2024, 5:22 PM

Herald added a subscriber: imp. · View Herald TranscriptOct 26 2024, 5:22 PM

Harbormaster completed remote builds in B60202: Diff 145484.Oct 26 2024, 5:22 PM

markj requested review of this revision.Oct 26 2024, 5:22 PM

markj edited the test plan for this revision. (Show Details)Oct 26 2024, 5:22 PM

This change looks logically correct to me and matches e1000.

I have tested on an I225-IT(2) using devctl and see no issues with attach/detach.

This revision is now accepted and ready to land.Oct 26 2024, 8:04 PM

Closed by commit rG35d05a14ed7e: igc: Remove a bogus register write in igc_if_queues_free() (authored by markj). · Explain WhyOct 26 2024, 9:06 PM

This revision was automatically updated to reflect the committed changes.

markj added a commit: rG35d05a14ed7e: igc: Remove a bogus register write in igc_if_queues_free().

markj added a commit: rG16b24ba87227: igc: Remove a bogus register write in igc_if_queues_free().Nov 2 2024, 2:29 PM

markj added a commit: rG57d879534096: igc: Remove a bogus register write in igc_if_queues_free().

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sys/

dev/

igc/

2 lines

Diff 145492

sys/dev/igc/if_igc.c

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