linux-kernel - Re: [PATCH v2 09/14] mtd: nand: sunxi: simplify optional reset handling

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Date:   Thu, 16 Mar 2017 09:55:09 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     linux-mtd@...ts.infradead.org,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/14] mtd: nand: sunxi: simplify optional reset
 handling

On Wed, 15 Mar 2017 12:31:47 +0100
Philipp Zabel <p.zabel@...gutronix.de> wrote:

> As of commit bb475230b8e5 ("reset: make optional functions really
> optional"), the reset framework API calls use NULL pointers to describe
> optional, non-present reset controls.
> 
> This allows to return errors from devm_reset_control_get_optional and to
> call reset_control_(de)assert unconditionally.
> 
> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
> Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

Applied.

Thanks,

Boris

> ---
>  drivers/mtd/nand/sunxi_nand.c | 19 ++++++++-----------
>  1 file changed, 8 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
> index 0eeeb8b889ea8..9afc182cbd4e8 100644
> --- a/drivers/mtd/nand/sunxi_nand.c
> +++ b/drivers/mtd/nand/sunxi_nand.c
> @@ -2212,16 +2212,15 @@ static int sunxi_nfc_probe(struct platform_device *pdev)
>  		goto out_ahb_clk_unprepare;
>  
>  	nfc->reset = devm_reset_control_get_optional(dev, "ahb");
> -	if (!IS_ERR(nfc->reset)) {
> -		ret = reset_control_deassert(nfc->reset);
> -		if (ret) {
> -			dev_err(dev, "reset err %d\n", ret);
> -			goto out_mod_clk_unprepare;
> -		}
> -	} else if (PTR_ERR(nfc->reset) != -ENOENT) {
> +	if (IS_ERR(nfc->reset)) {
>  		ret = PTR_ERR(nfc->reset);
>  		goto out_mod_clk_unprepare;
>  	}
> +	ret = reset_control_deassert(nfc->reset);
> +	if (ret) {
> +		dev_err(dev, "reset err %d\n", ret);
> +		goto out_mod_clk_unprepare;
> +	}
>  
>  	ret = sunxi_nfc_rst(nfc);
>  	if (ret)
> @@ -2262,8 +2261,7 @@ static int sunxi_nfc_probe(struct platform_device *pdev)
>  	if (nfc->dmac)
>  		dma_release_channel(nfc->dmac);
>  out_ahb_reset_reassert:
> -	if (!IS_ERR(nfc->reset))
> -		reset_control_assert(nfc->reset);
> +	reset_control_assert(nfc->reset);
>  out_mod_clk_unprepare:
>  	clk_disable_unprepare(nfc->mod_clk);
>  out_ahb_clk_unprepare:
> @@ -2278,8 +2276,7 @@ static int sunxi_nfc_remove(struct platform_device *pdev)
>  
>  	sunxi_nand_chips_cleanup(nfc);
>  
> -	if (!IS_ERR(nfc->reset))
> -		reset_control_assert(nfc->reset);
> +	reset_control_assert(nfc->reset);
>  
>  	if (nfc->dmac)
>  		dma_release_channel(nfc->dmac);