1 files changed, 7 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 6fb5522acd70..d2f19821d71d 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -1102,6 +1102,13 @@ static int pnv_eeh_reset(struct eeh_pe *pe, int option)
                 return -EIO;
         }
 
+        /*
+         * If dealing with the root bus (or the bus underneath the
+         * root port), we reset the bus underneath the root port.
+         *
+         * The cxl driver depends on this behaviour for bi-modal card
+         * switching.
+         */
         if (pci_is_root_bus(bus) ||
             pci_is_root_bus(bus->parent))
                 return pnv_eeh_root_reset(hose, option);