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linux-stable/drivers/pci/pcie
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Stanislaw Gruszka 3a342fa318 PCI/AER: Block runtime suspend when handling errors 
[ Upstream commit 002bf2fbc0 ]

PM runtime can be done simultaneously with AER error handling.  Avoid that
by using pm_runtime_get_sync() before and pm_runtime_put() after reset in
pcie_do_recovery() for all recovering devices.

pm_runtime_get_sync() will increase dev->power.usage_count counter to
prevent any possible future request to runtime suspend a device.  It will
also resume a device, if it was previously in D3hot state.

I tested with igc device by doing simultaneous aer_inject and rpm
suspend/resume via /sys/bus/pci/devices/PCI_ID/power/control and can
reproduce:

  igc 0000:02:00.0: not ready 65535ms after bus reset; giving up
  pcieport 0000:00:1c.2: AER: Root Port link has been reset (-25)
  pcieport 0000:00:1c.2: AER: subordinate device reset failed
  pcieport 0000:00:1c.2: AER: device recovery failed
  igc 0000:02:00.0: Unable to change power state from D3hot to D0, device inaccessible

The problem disappears when this patch is applied.

Link: https://lore.kernel.org/r/20240212120135.146068-1-stanislaw.gruszka@linux.intel.com
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2024-04-03 15:19:33 +02:00
..
Kconfig
…
Makefile
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aer.c PCI/AER: Decode Requester ID when no error info found 2024-02-05 20:12:59 +00:00
aer_inject.c
…
aspm.c Revert "PCI/ASPM: Remove pcie_aspm_pm_state_change()" 2024-01-10 17:10:20 +01:00
dpc.c PCI/DPC: Print all TLP Prefixes, not just the first 2024-03-26 18:20:45 -04:00
edr.c PCI/EDR: Clear Device Status after EDR error recovery 2023-05-11 23:03:28 +09:00
err.c PCI/AER: Block runtime suspend when handling errors 2024-04-03 15:19:33 +02:00
pme.c
…
portdrv.h
…
portdrv_core.c PCI/portdrv: Don't disable AER reporting in get_port_device_capability() 2022-07-13 14:43:40 -05:00
portdrv_pci.c
…
ptm.c PCI/PTM: Reorder functions in logical order 2022-09-12 15:29:52 -05:00
rcec.c
…