linux-kernel - Re: [PATCH] mtd: rawnand: brcmnand: Fix sparse warning in has_flash

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Date:   Sat, 19 Oct 2019 11:39:00 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Brian Norris <computersforpeace@...il.com>,
        Kamal Dasu <kdasu.kdev@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org (open list:BROADCOM STB NAND FLASH DRIVER),
        bcm-kernel-feedback-list@...adcom.com (open list:BROADCOM STB NAND
        FLASH DRIVER), linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH] mtd: rawnand: brcmnand: Fix sparse warning in
 has_flash_dma()

Hi Florian,

Florian Fainelli <f.fainelli@...il.com> wrote on Fri, 18 Oct 2019
16:38:44 -0700:

> Sparse rightfully complained about has_flash_dma():
> +drivers/mtd/nand/brcmnand/brcmnand.c:951:40: warning: Using plain integer as NULL pointer [sparse]

I don't get why would sparse complain about this... Anyway I prefer
the !!(<pointer>) alternative if you don't mind. Otherwise the "!=
NULL" comparison feels wrong.

> 
> Fixes: 27c5b17cd1b1 ("mtd: nand: add NAND driver "library" for Broadcom STB NAND controller")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/mtd/nand/raw/brcmnand/brcmnand.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> index 15ef30b368a5..73f7a0945399 100644
> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> @@ -909,7 +909,7 @@ static inline void brcmnand_set_wp(struct brcmnand_controller *ctrl, bool en)
>  
>  static inline bool has_flash_dma(struct brcmnand_controller *ctrl)
>  {
> -	return ctrl->flash_dma_base;
> +	return ctrl->flash_dma_base != NULL;
>  }
>  
>  static inline void disable_ctrl_irqs(struct brcmnand_controller *ctrl)


Thanks,
Miquèl