Patch "mfd: syscon: Call of_node_put() only when of_parse_phandle() takes a ref" has been added to the 6.6-stable tree

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

    mfd: syscon: Call of_node_put() only when of_parse_phandle() takes a ref

to the 6.6-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:
     mfd-syscon-call-of_node_put-only-when-of_parse_phand.patch
and it can be found in the queue-6.6 subdirectory.

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



commit a0446e8bb359a5b5b2cb5d3302c0a2835a163b30
Author: Peter Griffin <peter.griffin@xxxxxxxxxx>
Date:   Tue Feb 20 11:50:10 2024 +0000

    mfd: syscon: Call of_node_put() only when of_parse_phandle() takes a ref
    
    [ Upstream commit d2b0680cf3b05490b579e71b0df6e07451977745 ]
    
    of_parse_phandle() returns a device_node with refcount incremented, which
    the callee needs to call of_node_put() on when done. We should only call
    of_node_put() when the property argument is provided though as otherwise
    nothing has taken a reference on the node.
    
    Fixes: 45330bb43421 ("mfd: syscon: Allow property as NULL in syscon_regmap_lookup_by_phandle")
    Signed-off-by: Peter Griffin <peter.griffin@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240220115012.471689-2-peter.griffin@xxxxxxxxxx
    Signed-off-by: Lee Jones <lee@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index c9550368d9ea5..7d0e91164cbaa 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -238,7 +238,9 @@ struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
 		return ERR_PTR(-ENODEV);
 
 	regmap = syscon_node_to_regmap(syscon_np);
-	of_node_put(syscon_np);
+
+	if (property)
+		of_node_put(syscon_np);
 
 	return regmap;
 }




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