1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 89d3fd4c3cd2..5551bfbc47aa 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -365,7 +365,9 @@ static void acpi_processor_idle(void)
                 t1 = inl(acpi_fadt.xpm_tmr_blk.address);
                 /* Invoke C2 */
                 inb(cx->address);
-                /* Dummy op - must do something useless after P_LVL2 read */
+                /* Dummy wait op - must do something useless after P_LVL2 read
+                   because chipsets cannot guarantee that STPCLK# signal
+                   gets asserted in time to freeze execution properly. */
                 t2 = inl(acpi_fadt.xpm_tmr_blk.address);
                 /* Get end time (ticks) */
                 t2 = inl(acpi_fadt.xpm_tmr_blk.address);
@@ -403,7 +405,7 @@ static void acpi_processor_idle(void)
                 t1 = inl(acpi_fadt.xpm_tmr_blk.address);
                 /* Invoke C3 */
                 inb(cx->address);
-                /* Dummy op - must do something useless after P_LVL3 read */
+                /* Dummy wait op (see above) */
                 t2 = inl(acpi_fadt.xpm_tmr_blk.address);
                 /* Get end time (ticks) */
                 t2 = inl(acpi_fadt.xpm_tmr_blk.address);