Bug 217352 - AER Unsupported Request errors for LTR Messages from iwlwifi
Summary: AER Unsupported Request errors for LTR Messages from iwlwifi
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: PCI (show other bugs)
Hardware: All Linux
: P3 normal
Assignee: drivers_pci@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-04-18 19:24 UTC by Bjorn Helgaas
Modified: 2023-04-18 19:24 UTC (History)
0 users

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

Attachments
dmesg with pci=earlydump (266.93 KB, text/plain)
2023-04-18 19:24 UTC, Bjorn Helgaas 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Bjorn Helgaas 2023-04-18 19:24:19 UTC 
Created attachment 304158 [details]
dmesg with pci=earlydump

Ben Greear reported new Unsupported Request errors [1] after 8795e182b02d ("PCI/portdrv: Don't disable AER reporting in get_port_device_capability()"), which caused AER reporting to be enabled in more cases.

I think the problem is that an iwlwifi device has LTR enabled, so it sends LTR messages upstream periodically.  But one of the ports upstream from it has LTR *disabled*, so it reports an Unsupported Request.

Attaching dmesg log with "pci=earlydump" so we can see whether BIOS left LTR in this state or Linux broke something.

[1] https://lore.kernel.org/r/47b775c5-57fa-5edf-b59e-8a9041ffbee7@candelatech.com
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