powerpc/eeh: Enable IO path on permanent error

[mirror_ubuntu-zesty-kernel.git] / arch / powerpc / kernel / eeh.c

diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index 8180bfd7ab931c5b6d16a1c1b7cb73689206571b..9de7f79e702b1d755bdc855a2da82876959eeade 100644 (file)
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -298,9 +298,17 @@ void eeh_slot_error_detail(struct eeh_pe *pe, int severity)
         *
         * For pHyp, we have to enable IO for log retrieval. Otherwise,
         * 0xFF's is always returned from PCI config space.
+        *
+        * When the @severity is EEH_LOG_PERM, the PE is going to be
+        * removed. Prior to that, the drivers for devices included in
+        * the PE will be closed. The drivers rely on working IO path
+        * to bring the devices to quiet state. Otherwise, PCI traffic
+        * from those devices after they are removed is like to cause
+        * another unexpected EEH error.
         */
        if (!(pe->type & EEH_PE_PHB)) {
-               if (eeh_has_flag(EEH_ENABLE_IO_FOR_LOG))
+               if (eeh_has_flag(EEH_ENABLE_IO_FOR_LOG) ||
+                   severity == EEH_LOG_PERM)
                        eeh_pci_enable(pe, EEH_OPT_THAW_MMIO);
 
                /*