powerpc/powernv: Fix OPAL NVRAM driver OPAL_BUSY loops

The OPAL NVRAM driver does not sleep in case it gets OPAL_BUSY or
OPAL_BUSY_EVENT from firmware, which causes large scheduling
latencies, and various lockup errors to trigger (again, BMC reboot
can cause it).

Fix this by converting it to the standard form OPAL_BUSY loop that
sleeps.

Fixes: 628daa8d5abf ("powerpc/powernv: Add RTC and NVRAM support plus RTAS fallbacks")
Depends-on: 34dd25de9fe3 ("powerpc/powernv: define a standard delay for OPAL_BUSY type retry loops")
Cc: stable@vger.kernel.org # v3.2+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/powernv/opal-nvram.c b/arch/powerpc/platforms/powernv/opal-nvram.c
index ba2ff06a2c98..1bceb95f422d 100644
--- a/arch/powerpc/platforms/powernv/opal-nvram.c
+++ b/arch/powerpc/platforms/powernv/opal-nvram.c
@@ -11,6 +11,7 @@
 
 #define DEBUG
 
+#include <linux/delay.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/of.h>
@@ -56,8 +57,12 @@ static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index)
 
         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
                 rc = opal_write_nvram(__pa(buf), count, off);
-                if (rc == OPAL_BUSY_EVENT)
+                if (rc == OPAL_BUSY_EVENT) {
+                        msleep(OPAL_BUSY_DELAY_MS);
                         opal_poll_events(NULL);
+                } else if (rc == OPAL_BUSY) {
+                        msleep(OPAL_BUSY_DELAY_MS);
+                }
         }
 
         if (rc)