[PATCH 2/6] nand_wait : warn if the nand is busy on exit

[Matthieu CASTET]

This patch allow to detect buggy driver/hardware with
bad RnB (dev_ready) management.
This check cost nothing and could help to detect bugs.

Signed-off-by: Matthieu CASTET <matthieu.castet at parrot.com>
---
 drivers/mtd/nand/nand_base.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index a3c7fd3..095dfea 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -885,6 +885,8 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
 	led_trigger_event(nand_led_trigger, LED_OFF);
 
 	status = (int)chip->read_byte(mtd);
+	/* This can happen if in case of timeout or buggy dev_ready */
+	WARN_ON(!(status & NAND_STATUS_READY));
 	return status;
 }
 
-- 
1.7.5.4