linux-kernel - Re: [PATCH] staging: greybus: add logging statement when kfifo

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Date:   Wed, 10 Jul 2019 18:35:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Keyur Patel <iamkeyur96@...il.com>
Cc:     devel@...verdev.osuosl.org, Alex Elder <elder@...nel.org>,
        Johan Hovold <johan@...nel.org>, David Lin <dtwlin@...il.com>,
        greybus-dev@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: greybus: add logging statement when kfifo_alloc
 fails

On Wed, Jul 10, 2019 at 08:20:17AM -0400, Keyur Patel wrote:
> Added missing logging statement when kfifo_alloc fails, to improve
> debugging.
> 
> Signed-off-by: Keyur Patel <iamkeyur96@...il.com>
> ---
>  drivers/staging/greybus/uart.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c
> index b3bffe91ae99..86a395ae177d 100644
> --- a/drivers/staging/greybus/uart.c
> +++ b/drivers/staging/greybus/uart.c
> @@ -856,8 +856,10 @@ static int gb_uart_probe(struct gbphy_device *gbphy_dev,
>  
>  	retval = kfifo_alloc(&gb_tty->write_fifo, GB_UART_WRITE_FIFO_SIZE,
>  			     GFP_KERNEL);
> -	if (retval)
> +	if (retval) {
> +		pr_err("kfifo_alloc failed\n");
>  		goto exit_buf_free;
> +	}

You should have already gotten an error message from the log if this
fails, from the kmalloc_array() call failing, right?

So why is this needed?  We have been trying to remove these types of
messages and keep them in the "root" place where the failure happens.

thanks,

greg k-h