[PATCH 1/2] mtd: powernv_flash: Use WARN_ON_ONCE() rather than BUG_ON()

[Cyril Bur]

BUG_ON() should be reserved in situations where we can not longer
guarantee the integrity of the system. In the case where
powernv_flash_async_op() receives an impossible op, we can still
guarantee the integrity of the system.

Signed-off-by: Cyril Bur <cyril...@gmail.com>
---
I think patches to powernv_flash have gone through MPE in the past -
is this still correct?

 drivers/mtd/devices/powernv_flash.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/powernv_flash.c 
b/drivers/mtd/devices/powernv_flash.c
index f5396f26ddb4..a9a20c00687c 100644
--- a/drivers/mtd/devices/powernv_flash.c
+++ b/drivers/mtd/devices/powernv_flash.c
@@ -78,7 +78,8 @@ static int powernv_flash_async_op(struct mtd_info *mtd, enum 
flash_op op,
                rc = opal_flash_erase(info->id, offset, len, token);
                break;
        default:
-               BUG_ON(1);
+               WARN_ON_ONCE(1);
+               return -EIO;
        }
 
        if (rc != OPAL_ASYNC_COMPLETION) {
-- 
2.13.0