linux-kernel - Re: [PATCH] fpga: fpga-mgr: xilinx-spi: fix error messages on -EPROBE

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Date:   Sat, 6 Feb 2021 12:33:41 -0800
From:   Moritz Fischer <mdf@...nel.org>
To:     Luca Ceresoli <luca@...aceresoli.net>
Cc:     linux-fpga@...r.kernel.org, Moritz Fischer <mdf@...nel.org>,
        Tom Rix <trix@...hat.com>,
        Michal Simek <michal.simek@...inx.com>,
        Alan Tull <atull@...nel.org>,
        Anatolij Gustschin <agust@...x.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fpga: fpga-mgr: xilinx-spi: fix error messages on
 -EPROBE_DEFER

On Thu, Feb 04, 2021 at 01:13:13PM +0100, Luca Ceresoli wrote:
> The current code produces an error message on devm_gpiod_get() errors even
> when the error is -EPROBE_DEFER, which should be silent.
> 
> This has been observed producing a significant amount of messages like:
> 
>     xlnx-slave-spi spi1.1: Failed to get PROGRAM_B gpio: -517
> 
> Fix and simplify code by using the dev_err_probe() helper function.
> 
> Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>
> Fixes: dd2784c01d93 ("fpga manager: xilinx-spi: check INIT_B pin during write_init")
> Fixes: 061c97d13f1a ("fpga manager: Add Xilinx slave serial SPI driver")
> ---
>  drivers/fpga/xilinx-spi.c | 24 +++++++++---------------
>  1 file changed, 9 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/fpga/xilinx-spi.c b/drivers/fpga/xilinx-spi.c
> index 27defa98092d..fee4d0abf6bf 100644
> --- a/drivers/fpga/xilinx-spi.c
> +++ b/drivers/fpga/xilinx-spi.c
> @@ -233,25 +233,19 @@ static int xilinx_spi_probe(struct spi_device *spi)
>  
>  	/* PROGRAM_B is active low */
>  	conf->prog_b = devm_gpiod_get(&spi->dev, "prog_b", GPIOD_OUT_LOW);
> -	if (IS_ERR(conf->prog_b)) {
> -		dev_err(&spi->dev, "Failed to get PROGRAM_B gpio: %ld\n",
> -			PTR_ERR(conf->prog_b));
> -		return PTR_ERR(conf->prog_b);
> -	}
> +	if (IS_ERR(conf->prog_b))
> +		return dev_err_probe(&spi->dev, PTR_ERR(conf->prog_b),
> +				     "Failed to get PROGRAM_B gpio\n");
>  
>  	conf->init_b = devm_gpiod_get_optional(&spi->dev, "init-b", GPIOD_IN);
> -	if (IS_ERR(conf->init_b)) {
> -		dev_err(&spi->dev, "Failed to get INIT_B gpio: %ld\n",
> -			PTR_ERR(conf->init_b));
> -		return PTR_ERR(conf->init_b);
> -	}
> +	if (IS_ERR(conf->init_b))
> +		return dev_err_probe(&spi->dev, PTR_ERR(conf->init_b),
> +				     "Failed to get INIT_B gpio\n");
>  
>  	conf->done = devm_gpiod_get(&spi->dev, "done", GPIOD_IN);
> -	if (IS_ERR(conf->done)) {
> -		dev_err(&spi->dev, "Failed to get DONE gpio: %ld\n",
> -			PTR_ERR(conf->done));
> -		return PTR_ERR(conf->done);
> -	}
> +	if (IS_ERR(conf->done))
> +		return dev_err_probe(&spi->dev, PTR_ERR(conf->done),
> +				     "Failed to get DONE gpio\n");
>  
>  	mgr = devm_fpga_mgr_create(&spi->dev,
>  				   "Xilinx Slave Serial FPGA Manager",
> -- 
> 2.30.0
> 
Looks good, will queue.

- Moritz