Bug 214933 - [Regression] Commit 69a74aef8a18eef20fb0044b5e164af41b84db21 "e100: use generic power management" - breaks suspend/resume
Summary: [Regression] Commit 69a74aef8a18eef20fb0044b5e164af41b84db21 "e100: use gener...
Alias: None
Product: Drivers
Classification: Unclassified
Component: Network (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Default virtual assignee for network-wireless-intel
Depends on:
Reported: 2021-11-03 13:33 UTC by Alexey Kuznetsov
Modified: 2021-11-30 07:25 UTC (History)
5 users (show)

See Also:
Kernel Version: 5.10.70
Regression: No
Bisected commit-id:

proposed fix, only compile tested (2.49 KB, patch)
2021-11-10 02:07 UTC, Jesse Brandeburg
Details | Diff
proposed fix, only compile tested (2.53 KB, patch)
2021-11-10 02:31 UTC, Jesse Brandeburg
Details | Diff

Description Alexey Kuznetsov 2021-11-03 13:33:37 UTC

My notebook unable to suspend / resume due to bug in kernel. I discovered with series of 'git bisect' rebuilds bogus commit.

To make recent (I'm using 5.10) kernel to work I had to revert:


Following my original bug report against debian kernel (no one responds):

Comment 1 Alexey Kuznetsov 2021-11-04 18:21:01 UTC
Another person reporting same hardware issues related to the same commit:

  * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=995927
Comment 2 Artem S. Tashkinov 2021-11-05 11:21:57 UTC
CC'ing the relevant people.

Commit 69a74aef8a18eef20fb0044b5e164af41b84db21 "e100: use generic power management" breaks suspend/resume for some configurations.
Comment 3 Jakub Kicinski 2021-11-05 13:49:12 UTC
Not sure how this go assigned to Intel WiFi. Adding Tony from Intel Ethernet as well.
If the issue does not get addressed please just send a revert to the ML.
Comment 4 Alexey Kuznetsov 2021-11-05 13:52:39 UTC
My fault, that was my first assumption suspend / resume freeze related to my ipw2100. I did assign it to wifi by mistake. it is clear now 100% e100 issue.
Comment 5 Jesse Brandeburg 2021-11-10 01:19:42 UTC
Hi Alexey! Thanks for following up on your report for this. I looked into this code, it seems patently wrong.

From the description of the problem I suspect the device is being left in D3 after the resume, and timing out all operations.

As for a fix, I'll attach a proposed patch here, but I don't think I have an e100 laying around any more to test.
Comment 6 Jesse Brandeburg 2021-11-10 02:07:11 UTC
Created attachment 299499 [details]
proposed fix, only compile tested

Hi, if you can please give this patch a try, and forgive me if it doesn't quite work right as I can't test it easily.

Feedback welcome!
Comment 7 Jesse Brandeburg 2021-11-10 02:31:05 UTC
Created attachment 299501 [details]
proposed fix, only compile tested

This change is more likely to work, since we're thinking the device likely isn't enabled correctly (probably the pci_enable_master() is the whole bug)
Comment 8 Alexey Kuznetsov 2021-11-10 07:39:53 UTC
Hank Jesse! It works! I haven't tested ethernet connection it self, since I'm using wifi on this machine. But interfaces comes up and suspend / resume works fine without task blocked for... kernel spam!

I've tested v5.14.16 + debian patches + [299501 patch]
Comment 10 Jesse Brandeburg 2021-11-30 01:05:11 UTC
Patch accepted upstream:

I have no way to set this bug to resolved in bugzilla, can someone help?

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