[PATCH] powerpc/powernv: Fix the state of root PE

The PE for root bus (root PE) can be removed because of PCI hot
remove in EEH recovery path for fenced PHB error. We need update
@phb->root_pe_populated accordingly so that the root PE can be
populated again in forthcoming PCI hot add path. Also, the PE
shouldn't be destroyed as it's global and reserved resource.

Fixes: c5f7700bbd2e ("powerpc/powernv: Dynamically release PE")
Reported-by: Frederic Barrat <redacted>
Signed-off-by: Gavin Shan <redacted>
---
 arch/powerpc/platforms/powernv/pci-ioda.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index e98f4a8..c38a6a1 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c

@@ -3426,7 +3426,16 @@ static void pnv_ioda_release_pe(struct pnv_ioda_pe *pe)
 		}
 	}
 
-	pnv_ioda_free_pe(pe);
+	/* The PE for root bus can be removed because of hotplug in EEH
+	 * recovery for fenced PHB error. We need mark the PE dead so
+	 * that it can be populated again in PCI hot add path. The PE
+	 * shouldn't be destroyed as it's the global reserved resource.
+	 */
+	if (phb->ioda.root_pe_populated &&
+	    phb->ioda.root_pe_idx == pe->pe_number)
+		phb->ioda.root_pe_populated = false;
+	else
+		pnv_ioda_free_pe(pe);
 }
 
 static void pnv_pci_release_device(struct pci_dev *pdev)

-- 
2.1.0

On Tue, 2016-13-09 at 06:40:24 UTC, Gavin Shan wrote:

The PE for root bus (root PE) can be removed because of PCI hot
remove in EEH recovery path for fenced PHB error. We need update
@phb->root_pe_populated accordingly so that the root PE can be
populated again in forthcoming PCI hot add path. Also, the PE
shouldn't be destroyed as it's global and reserved resource.

Fixes: c5f7700bbd2e ("powerpc/powernv: Dynamically release PE")
Reported-by: Frederic Barrat <redacted>
Signed-off-by: Gavin Shan <redacted>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/6eaed1665fc6864fbdbffcc6f4

cheers