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

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Message-ID: <20160710013010.GA12327@localhost>
Date:	Sat, 9 Jul 2016 18:30:10 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	linux-mtd@...ts.infradead.org, Kamal Dasu <kdasu.kdev@...il.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Richard Weinberger <richard@....at>,
	David Woodhouse <dwmw2@...radead.org>,
	"open list:BROADCOM STB NAND FLASH DRIVER" 
	<bcm-kernel-feedback-list@...adcom.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: nand: brcmnand: Change BUG_ON in brcmnand_send_cmd

On Fri, Jul 08, 2016 at 10:36:39AM -0700, Florian Fainelli wrote:
> 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>

Acked-by: Brian Norris <computersforpeace@...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
>