linux-kernel - Re: [PATCH 4/10] drivers/net/can/flexcan.c: add missing clk

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Message-ID: <Pine.LNX.4.64.1106020748020.22932@ask.diku.dk>
Date:	Thu, 2 Jun 2011 07:48:50 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	David Miller <davem@...emloft.net>
Cc:	joe@...ches.com, wg@...ndegger.com,
	kernel-janitors@...r.kernel.org, socketcan-core@...ts.berlios.de,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, wharms@....de
Subject: Re: [PATCH 4/10] drivers/net/can/flexcan.c: add missing clk_put

From: Julia Lawall <julia@...u.dk>

The failed_get label is used after the call to clk_get has succeeded, so it
should be moved up above the call to clk_put.

The failed_req labels doesn't do anything different than failed_get, so
delete it.

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

// <smpl>
@r exists@
expression e1,e2;
statement S;
@@

e1 = clk_get@p1(...);
... when != e1 = e2
    when != clk_put(e1)
    when any
if (...) { ... when != clk_put(e1)
               when != if (...) { ... clk_put(e1) ... }
* return@p3 ...;
 } else S
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/net/can/flexcan.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index d499056..1767811 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -923,7 +923,7 @@ static int __devinit flexcan_probe(struct platform_device *pdev)
 	mem_size = resource_size(mem);
 	if (!request_mem_region(mem->start, mem_size, pdev->name)) {
 		err = -EBUSY;
-		goto failed_req;
+		goto failed_get;
 	}
 
 	base = ioremap(mem->start, mem_size);
@@ -977,9 +977,8 @@ static int __devinit flexcan_probe(struct platform_device *pdev)
 	iounmap(base);
  failed_map:
 	release_mem_region(mem->start, mem_size);
- failed_req:
-	clk_put(clk);
  failed_get:
+	clk_put(clk);
  failed_clock:
 	return err;
 }
--
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