linux-kernel - RE: [PATCH 03/15] cxl: Unify debug messages when calling devm_cxl_add

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Message-ID: <631983487d3d3_5801629418@dwillia2-xfh.jf.intel.com.notmuch>
Date:   Wed, 7 Sep 2022 22:53:12 -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 03/15] cxl: Unify debug messages when calling
 devm_cxl_add_port()

Robert Richter wrote:
> CXL ports are added in a couple of code paths using
> devm_cxl_add_port(). Debug messages are individually generated, but
> are incomplete and inconsistent. Change this by moving its generation
> to devm_cxl_add_port(). This unifies the messages and reduces code
> duplication. Also, generate messages on failure.
> 
> Signed-off-by: Robert Richter <rrichter@....com>
> ---
>  drivers/cxl/acpi.c      |  2 --
>  drivers/cxl/core/port.c | 39 ++++++++++++++++++++++++++++-----------
>  2 files changed, 28 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
> index fb649683dd3a..767a91f44221 100644
> --- a/drivers/cxl/acpi.c
> +++ b/drivers/cxl/acpi.c
> @@ -220,7 +220,6 @@ static int add_host_bridge_uport(struct device *match, void *arg)
>  	port = devm_cxl_add_port(host, match, dport->component_reg_phys, dport);
>  	if (IS_ERR(port))
>  		return PTR_ERR(port);
> -	dev_dbg(host, "%s: add: %s\n", dev_name(match), dev_name(&port->dev));
>  
>  	return 0;
>  }
> @@ -466,7 +465,6 @@ static int cxl_acpi_probe(struct platform_device *pdev)
>  	root_port = devm_cxl_add_port(host, host, CXL_RESOURCE_NONE, NULL);
>  	if (IS_ERR(root_port))
>  		return PTR_ERR(root_port);
> -	dev_dbg(host, "add: %s\n", dev_name(&root_port->dev));
>  
>  	rc = bus_for_each_dev(adev->dev.bus, NULL, root_port,
>  			      add_host_bridge_dport);
> diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
> index bffde862de0b..8604cda88787 100644
> --- a/drivers/cxl/core/port.c
> +++ b/drivers/cxl/core/port.c
> @@ -666,13 +666,17 @@ struct cxl_port *devm_cxl_add_port(struct device *host, struct device *uport,
>  				   resource_size_t component_reg_phys,
>  				   struct cxl_dport *parent_dport)
>  {
> -	struct cxl_port *port;
> +	struct cxl_port *port, *parent_port;
>  	struct device *dev;
>  	int rc;
>  
> +	parent_port = parent_dport ? parent_dport->port : NULL;
> +
>  	port = cxl_port_alloc(uport, component_reg_phys, parent_dport);
> -	if (IS_ERR(port))
> -		return port;
> +	if (IS_ERR(port)) {
> +		rc = PTR_ERR(port);
> +		goto err_out;

While I agree this unifies the error messaging I am not a fan of what
this does to the readability of the error exits. What about a compromise
of renaming devm_cxl_add_port to __devm_cxl_add_port() and add back a
new devm_cxl_add_port that does the unified debug messaging?