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-rw-r--r--arch/powerpc/platforms/powernv/setup.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 19884b2a51b4..a932feb2901c 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -145,8 +145,10 @@ static void pnv_shutdown(void)
/* Let the PCI code clear up IODA tables */
pnv_pci_shutdown();
- /* And unregister all OPAL interrupts so they don't fire
- * up while we kexec
+ /*
+ * Stop OPAL activity: Unregister all OPAL interrupts so they
+ * don't fire up while we kexec and make sure all potentially
+ * DMA'ing ops are complete (such as dump retrieval).
*/
opal_shutdown();
}

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