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From: Julia Lawall <Julia.Lawall@lip6.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: kernel-janitors@vger.kernel.org,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	Russell King - ARM Linux <linux@arm.linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
	Andrew Lunn <andrew@lunn.ch>, Bjorn Helgaas <bhelgaas@google.com>,
	Jason Cooper <jason@lakedaemon.net>
Subject: [PATCH 5/6] powerpc/btext: add missing of_node_put
Date: Fri, 20 Nov 2015 21:33:23 +0100	[thread overview]
Message-ID: <1448051604-25256-6-git-send-email-Julia.Lawall@lip6.fr> (raw)
In-Reply-To: <1448051604-25256-1-git-send-email-Julia.Lawall@lip6.fr>

for_each_node_by_type performs an of_node_get on each iteration, so
a break out of the loop requires an of_node_put.

A simplified version of the semantic patch that fixes this problem is as
follows (http://coccinelle.lip6.fr):

// <smpl>
@@
local idexpression n;
expression e;
@@

 for_each_node_by_type(n,...) {
   ...
(
   of_node_put(n);
|
   e = n
|
+  of_node_put(n);
?  break;
)
   ...
 }
... when != n
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 arch/powerpc/kernel/btext.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/btext.c b/arch/powerpc/kernel/btext.c
index 41c011c..8d05ef2 100644
--- a/arch/powerpc/kernel/btext.c
+++ b/arch/powerpc/kernel/btext.c
@@ -257,8 +257,10 @@ int __init btext_find_display(int allow_nonstdout)
 			rc = btext_initialize(np);
 			printk("result: %d\n", rc);
 		}
-		if (rc == 0)
+		if (rc == 0) {
+			of_node_put(np);
 			break;
+		}
 	}
 	return rc;
 }


WARNING: multiple messages have this Message-ID (diff)
From: Julia Lawall <Julia.Lawall@lip6.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: kernel-janitors@vger.kernel.org,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	Russell King - ARM Linux <linux@arm.linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
	Andrew Lunn <andrew@lunn.ch>, Bjorn Helgaas <bhelgaas@google.com>,
	Jason Cooper <jason@lakedaemon.net>
Subject: [PATCH 5/6] powerpc/btext: add missing of_node_put
Date: Fri, 20 Nov 2015 20:33:23 +0000	[thread overview]
Message-ID: <1448051604-25256-6-git-send-email-Julia.Lawall@lip6.fr> (raw)
In-Reply-To: <1448051604-25256-1-git-send-email-Julia.Lawall@lip6.fr>

for_each_node_by_type performs an of_node_get on each iteration, so
a break out of the loop requires an of_node_put.

A simplified version of the semantic patch that fixes this problem is as
follows (http://coccinelle.lip6.fr):

// <smpl>
@@
local idexpression n;
expression e;
@@

 for_each_node_by_type(n,...) {
   ...
(
   of_node_put(n);
|
   e = n
|
+  of_node_put(n);
?  break;
)
   ...
 }
... when != n
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 arch/powerpc/kernel/btext.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/btext.c b/arch/powerpc/kernel/btext.c
index 41c011c..8d05ef2 100644
--- a/arch/powerpc/kernel/btext.c
+++ b/arch/powerpc/kernel/btext.c
@@ -257,8 +257,10 @@ int __init btext_find_display(int allow_nonstdout)
 			rc = btext_initialize(np);
 			printk("result: %d\n", rc);
 		}
-		if (rc = 0)
+		if (rc = 0) {
+			of_node_put(np);
 			break;
+		}
 	}
 	return rc;
 }


  parent reply	other threads:[~2015-11-20 20:47 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-20 20:33 [PATCH 0/6] add missing of_node_put Julia Lawall
2015-11-20 20:33 ` Julia Lawall
2015-11-20 20:33 ` [PATCH 1/6] powerpc/6xx: " Julia Lawall
2015-11-20 20:33   ` Julia Lawall
2015-11-20 20:33 ` [PATCH 2/6] powerpc/pseries: " Julia Lawall
2015-11-20 20:33   ` Julia Lawall
2015-11-20 20:33 ` [PATCH 3/6] powerpc/powernv: " Julia Lawall
2015-11-20 20:33   ` Julia Lawall
2015-11-20 20:33 ` [PATCH 4/6] powerpc/kexec: " Julia Lawall
2015-11-20 20:33   ` Julia Lawall
2015-11-20 20:33 ` Julia Lawall [this message]
2015-11-20 20:33   ` [PATCH 5/6] powerpc/btext: " Julia Lawall
2015-11-20 20:33 ` [PATCH 6/6] powerpc/cell: " Julia Lawall
2015-11-20 20:33   ` Julia Lawall
2021-11-25  9:35 ` (subset) [PATCH 0/6] " Michael Ellerman
2021-11-25  9:35   ` Michael Ellerman

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