linux-kernel - RE: [PATCH 04/15] cxl: Unify debug messages when calling devm_cxl_add

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Message-ID: <631983e2bc50f_58016294a3@dwillia2-xfh.jf.intel.com.notmuch>
Date:   Wed, 7 Sep 2022 22:55:46 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Robert Richter <rrichter@....com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Ira Weiny" <ira.weiny@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        "Dan Williams" <dan.j.williams@...el.com>
CC:     <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Robert Richter <rrichter@....com>
Subject: RE: [PATCH 04/15] cxl: Unify debug messages when calling
 devm_cxl_add_dport()

Robert Richter wrote:
> CXL dports are added in a couple of code paths using
> devm_cxl_add_dport(). Debug messages are individually generated, but
> are incomplete and inconsistent. Change this by moving its generation
> to devm_cxl_add_dport(). This unifies the messages and reduces code
> duplication. Also, generate messages on failure.
> 
> Signed-off-by: Robert Richter <rrichter@....com>
> ---
>  drivers/cxl/acpi.c           |  7 ++-----
>  drivers/cxl/core/pci.c       |  2 --
>  drivers/cxl/core/port.c      | 28 ++++++++++++++++++++--------
>  tools/testing/cxl/test/cxl.c |  8 +-------
>  4 files changed, 23 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
> index 767a91f44221..31e104f0210f 100644
> --- a/drivers/cxl/acpi.c
> +++ b/drivers/cxl/acpi.c
> @@ -282,12 +282,9 @@ static int add_host_bridge_dport(struct device *match, void *arg)
>  	}
>  
>  	dport = devm_cxl_add_dport(root_port, match, uid, ctx.chbcr);
> -	if (IS_ERR(dport)) {
> -		dev_err(host, "failed to add downstream port: %s\n",
> -			dev_name(match));
> +	if (IS_ERR(dport))
>  		return PTR_ERR(dport);
> -	}
> -	dev_dbg(host, "add dport%llu: %s\n", uid, dev_name(match));
> +
>  	return 0;
>  }
>  
> diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
> index 9240df53ed87..0dbbe8d39b07 100644
> --- a/drivers/cxl/core/pci.c
> +++ b/drivers/cxl/core/pci.c
> @@ -62,8 +62,6 @@ static int match_add_dports(struct pci_dev *pdev, void *data)
>  	}
>  	ctx->count++;
>  
> -	dev_dbg(&port->dev, "add dport%d: %s\n", port_num, dev_name(&pdev->dev));
> -
>  	return 0;
>  }
>  
> diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
> index 8604cda88787..61e9915162d5 100644
> --- a/drivers/cxl/core/port.c
> +++ b/drivers/cxl/core/port.c
> @@ -914,12 +914,16 @@ struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port,
>  	}
>  
>  	if (snprintf(link_name, CXL_TARGET_STRLEN, "dport%d", port_id) >=
> -	    CXL_TARGET_STRLEN)
> -		return ERR_PTR(-EINVAL);
> +	    CXL_TARGET_STRLEN) {
> +		rc = -EINVAL;
> +		goto err;
> +	}
>  
>  	dport = devm_kzalloc(host, sizeof(*dport), GFP_KERNEL);
> -	if (!dport)
> -		return ERR_PTR(-ENOMEM);
> +	if (!dport) {
> +		rc = -ENOMEM;
> +		goto err;
> +	}

Similar comment as before of using a goto just to ensure the log message
is called, I suspect a wrapper to do the logging ends up with less code
thrash.