Patch "cxl/region: Handle endpoint decoders in cxl_region_find_decoder()" has been added to the 6.7-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    cxl/region: Handle endpoint decoders in cxl_region_find_decoder()

to the 6.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     cxl-region-handle-endpoint-decoders-in-cxl_region_fi.patch
and it can be found in the queue-6.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit b955b0c00f16117f6829a65f416bf263f67b6563
Author: Alison Schofield <alison.schofield@xxxxxxxxx>
Date:   Wed Jan 31 13:59:30 2024 -0800

    cxl/region: Handle endpoint decoders in cxl_region_find_decoder()
    
    [ Upstream commit 453a7fde8031a5192ed2f9646ad048c1a5e930dc ]
    
    In preparation for adding a new caller of cxl_region_find_decoders()
    teach it to find a decoder from a cxl_endpoint_decoder structure.
    
    Combining switch and endpoint decoder lookup in one function prevents
    code duplication in call sites.
    
    Update the existing caller.
    
    Signed-off-by: Alison Schofield <alison.schofield@xxxxxxxxx>
    Tested-by: Wonjae Lee <wj28.lee@xxxxxxxxxxx>
    Link: https://lore.kernel.org/r/79ae6d72978ef9f3ceec9722e1cb793820553c8e.1706736863.git.alison.schofield@xxxxxxxxx
    Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 7bb656237fa0c..764998fe03edc 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -729,12 +729,17 @@ static int match_auto_decoder(struct device *dev, void *data)
 	return 0;
 }
 
-static struct cxl_decoder *cxl_region_find_decoder(struct cxl_port *port,
-						   struct cxl_region *cxlr)
+static struct cxl_decoder *
+cxl_region_find_decoder(struct cxl_port *port,
+			struct cxl_endpoint_decoder *cxled,
+			struct cxl_region *cxlr)
 {
 	struct device *dev;
 	int id = 0;
 
+	if (port == cxled_to_port(cxled))
+		return &cxled->cxld;
+
 	if (test_bit(CXL_REGION_F_AUTO, &cxlr->flags))
 		dev = device_find_child(&port->dev, &cxlr->params,
 					match_auto_decoder);
@@ -852,10 +857,7 @@ static int cxl_rr_alloc_decoder(struct cxl_port *port, struct cxl_region *cxlr,
 {
 	struct cxl_decoder *cxld;
 
-	if (port == cxled_to_port(cxled))
-		cxld = &cxled->cxld;
-	else
-		cxld = cxl_region_find_decoder(port, cxlr);
+	cxld = cxl_region_find_decoder(port, cxled, cxlr);
 	if (!cxld) {
 		dev_dbg(&cxlr->dev, "%s: no decoder available\n",
 			dev_name(&port->dev));