linux-kernel - [PATCH] mtd: nand: brcmnand: Change BUG_ON in brcmnand_send

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Date:	Fri,  8 Jul 2016 10:36:39 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	linux-mtd@...ts.infradead.org
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	Brian Norris <computersforpeace@...il.com>,
	Kamal Dasu <kdasu.kdev@...il.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Richard Weinberger <richard@....at>,
	David Woodhouse <dwmw2@...radead.org>,
	bcm-kernel-feedback-list@...adcom.com (open list:BROADCOM STB NAND
	FLASH DRIVER), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] mtd: nand: brcmnand: Change BUG_ON in brcmnand_send_cmd

Change the BUG_ON() condition in brcmnand_send_cmd() which checks for
the interrupt status "controller ready" bit to a WARN_ON.

There is no good reason to kill the system when this condition occur
because we could have systems which listed the NAND controller as
available (e.g: from Device Tree), but the NAND chip could be
malfunctioning and not responding.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
Note that I even hesitated to remove that completely, but there is
some value in knowing about this condition since it helps figuring
out what could be wrong.

 drivers/mtd/nand/brcmnand/brcmnand.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index b6062a2f3dfd..72bdc283778d 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -1165,7 +1165,7 @@ static void brcmnand_send_cmd(struct brcmnand_host *host, int cmd)
 	ctrl->cmd_pending = cmd;
 
 	intfc = brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS);
-	BUG_ON(!(intfc & INTFC_CTLR_READY));
+	WARN_ON(!(intfc & INTFC_CTLR_READY));
 
 	mb(); /* flush previous writes */
 	brcmnand_write_reg(ctrl, BRCMNAND_CMD_START,
-- 
2.7.4