linux-kernel - Re: [PATCH v2 13/18] cxl/region: Add function to find a port's switch decoder by range

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Message-ID: <Z6nxo_tlI4o2I9jW@rric.localdomain>
Date: Mon, 10 Feb 2025 13:31:31 +0100
From: Robert Richter <rrichter@....com>
To: Alison Schofield <alison.schofield@...el.com>
Cc: Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Davidlohr Bueso <dave@...olabs.net>, linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org, Gregory Price <gourry@...rry.net>,
	"Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>,
	Terry Bowman <terry.bowman@....com>
Subject: Re: [PATCH v2 13/18] cxl/region: Add function to find a port's
 switch decoder by range

On 07.02.25 14:22:06, Alison Schofield wrote:
> On Fri, Feb 07, 2025 at 04:37:48PM +0100, Robert Richter wrote:
> > Factor out code to find the switch decoder of a port for a specific
> > address range. Reuse the code to search a root decoder, create the
> > function cxl_port_find_switch_decoder() and rework
> > match_root_decoder_by_range() to be usable for switch decoders too.
> > 
> > Signed-off-by: Robert Richter <rrichter@....com>
> > ---
> >  drivers/cxl/core/region.c | 46 +++++++++++++++++++++++----------------
> >  1 file changed, 27 insertions(+), 19 deletions(-)
> > 
> > diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> > index cfcd235f311e..15286acdf6d1 100644
> > --- a/drivers/cxl/core/region.c
> > +++ b/drivers/cxl/core/region.c
> 
> snip
> 
> 
> > @@ -3218,9 +3234,8 @@ cxl_find_root_decoder(struct cxl_endpoint_decoder *cxled)
> >  	if (!iter)
> >  		return NULL;
> >  
> > -	cxlrd_dev = device_find_child(&iter->dev, hpa,
> > -				      match_root_decoder_by_range);
> > -	if (!cxlrd_dev) {
> > +	cxld = cxl_port_find_switch_decoder(iter, hpa);
> > +	if (!cxld) {
> >  		dev_err(cxlmd->dev.parent,
> >  			"%s:%s no CXL window for range %#llx:%#llx\n",
> >  			dev_name(&cxlmd->dev), dev_name(&cxld->dev),
> 
> The dev_err() needs cleanup to align with !cxld.
> As it is now, fails w NULL ptr dereference.

Yes, fixed in v3. Thanks for catching this.

-Robert