[PATCH v1] PCI/AER: Avoid power state transition during system suspend

[Raag Jadav <raag.jadav@intel.com>]

If an error is triggered while system suspend is in progress, any bus
level power state transition will result in unpredictable error handling.
Mark skip_bus_pm flag as true to avoid this.

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
---

Ideally we'd want to defer recovery until system resume, but this is
good enough to prevent device suspend.

More discussion at [1].
[1] https://lore.kernel.org/r/Z-38rPeN_j7YGiEl@black.fi.intel.com

 drivers/pci/pcie/aer.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 508474e17183..5acf4efc2df3 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -1108,6 +1108,12 @@ static void pci_aer_handle_error(struct pci_dev *dev, struct aer_err_info *info)
 
 static void handle_error_source(struct pci_dev *dev, struct aer_err_info *info)
 {
+	/*
+	 * Avoid any power state transition if an error is triggered during
+	 * system suspend.
+	 */
+	dev->skip_bus_pm = true;
+
 	cxl_rch_handle_error(dev, info);
 	pci_aer_handle_error(dev, info);
 	pci_dev_put(dev);
-- 
2.34.1