powerpc/eeh: Make EEH driver device hotplug safe

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Multiple race conditions existed between the PCIe hotplug driver and the
EEH driver, leading to a variety of kernel oopses of the same general
nature:

<pcie device unplug>
<eeh driver trigger>
<hotplug removal trigger>
<pcie tree reconfiguration>
<eeh recovery next step>
<oops in EEH driver bus iteration loop>

A second class of oops is also seen when the underlying bus disappears
during device recovery.

Refactor the EEH module to be PCI rescan and remove safe.  Also clean
up a few minor formatting / readability issues.

Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/1334208367.1359861.1752615503144.JavaMail.zimbra@raptorengineeringinc.com

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This commit is contained in:

Timothy Pearson 2025-07-15 16:38:23 -05:00 • committed by Madhavan Srinivasan

parent e82b34eed0

commit 1010b4c012

2 changed files with 38 additions and 20 deletions

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48

arch/powerpc/kernel/eeh_driver.c

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10

arch/powerpc/kernel/eeh_pe.c

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