linux-kernel - [PATCH] cxl: replace loop with for_each_child_of_node(), remove unneeded of_node

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Date:	Fri, 29 Jul 2016 13:55:34 +1000
From:	Andrew Donnellan <andrew.donnellan@....ibm.com>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	imunsie@....ibm.com, fbarrat@...ux.vnet.ibm.com,
	clombard@...ux.vnet.ibm.com, kernel-janitors@...r.kernel.org,
	elfring@...rs.sourceforge.net, julia.lawall@...6.fr,
	linux-kernel@...r.kernel.org
Subject: [PATCH] cxl: replace loop with for_each_child_of_node(), remove unneeded of_node_put()

Rewrite the cxl_guest_init_afu() loop in cxl_of_probe() to use
for_each_child_of_node() rather than a hand-coded for loop.

Remove the useless of_node_put(afu_np) call after the loop, where it's
guaranteed that afu_np == NULL.

Reported-by: SF Markus Elfring <elfring@...rs.sourceforge.net>
Reported-by: Julia Lawall <julia.lawall@...6.fr>
Signed-off-by: Andrew Donnellan <andrew.donnellan@....ibm.com>

---

Checked the of_node_put() with Fred, he thinks it was probably just left
over from an earlier private version of the code and we can just get rid of
it.
---
 drivers/misc/cxl/of.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/misc/cxl/of.c b/drivers/misc/cxl/of.c
index edc4583..ec175ea 100644
--- a/drivers/misc/cxl/of.c
+++ b/drivers/misc/cxl/of.c
@@ -460,7 +460,7 @@ int cxl_of_probe(struct platform_device *pdev)
 	struct device_node *afu_np = NULL;
 	struct cxl *adapter = NULL;
 	int ret;
-	int slice, slice_ok;
+	int slice = 0, slice_ok = 0;
 
 	pr_devel("in %s\n", __func__);
 
@@ -476,13 +476,13 @@ int cxl_of_probe(struct platform_device *pdev)
 	}
 
 	/* init afu */
-	slice_ok = 0;
-	for (afu_np = NULL, slice = 0; (afu_np = of_get_next_child(np, afu_np)); slice++) {
+	for_each_child_of_node(np, afu_np) {
 		if ((ret = cxl_guest_init_afu(adapter, slice, afu_np)))
 			dev_err(&pdev->dev, "AFU %i failed to initialise: %i\n",
 				slice, ret);
 		else
 			slice_ok++;
+		slice++;
 	}
 
 	if (slice_ok == 0) {
@@ -490,8 +490,6 @@ int cxl_of_probe(struct platform_device *pdev)
 		adapter->slices = 0;
 	}
 
-	if (afu_np)
-		of_node_put(afu_np);
 	return 0;
 }
 
-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan@....ibm.com  IBM Australia Limited