From: wen yang <yellowriver2010@hotmail.com>
To: "harveyhuntnexus@gmail.com" <harveyhuntnexus@gmail.com>,
"bbrezillon@kernel.org" <bbrezillon@kernel.org>,
"miquel.raynal@bootlin.com" <miquel.raynal@bootlin.com>,
"richard@nod.at" <richard@nod.at>,
"dwmw2@infradead.org" <dwmw2@infradead.org>,
"computersforpeace@gmail.com" <computersforpeace@gmail.com>,
"marek.vasut@gmail.com" <marek.vasut@gmail.com>
Cc: "alexandre.belloni@bootlin.com" <alexandre.belloni@bootlin.com>,
wen yang <yellowriver2010@hotmail.com>,
"nicolas.ferre@microchip.com" <nicolas.ferre@microchip.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"ludovic.desroches@microchip.com"
<ludovic.desroches@microchip.com>,
"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>
Subject: [PATCH] mtd: rawnand: jz4780: fix object reference leaks in jz4780_bch_get
Date: Tue, 5 Feb 2019 09:36:48 +0000 [thread overview]
Message-ID: <HK0PR02MB36349BDCE693F67F150B0172B26E0@HK0PR02MB3634.apcprd02.prod.outlook.com> (raw)
of_find_device_by_node() takes a reference to the struct device
when it finds a match via get_device, there is no need to call
get_device() twice.
We also should make sure to drop the reference to the device
taken by of_find_device_by_node() on driver unbind.
Fixes: ae02ab00aa3c ("mtd: nand: jz4780: driver for NAND devices on JZ4780 SoCs")
Signed-off-by: Wen Yang <yellowriver2010@hotmail.com>
Suggested-by: Boris Brezillon <bbrezillon@kernel.org>
Cc: Harvey Hunt <harveyhuntnexus@gmail.com>
Cc: Boris Brezillon <bbrezillon@kernel.org>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: linux-mtd@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
drivers/mtd/nand/raw/jz4780_bch.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/nand/raw/jz4780_bch.c b/drivers/mtd/nand/raw/jz4780_bch.c
index 7201827..d0ce5de 100644
--- a/drivers/mtd/nand/raw/jz4780_bch.c
+++ b/drivers/mtd/nand/raw/jz4780_bch.c
@@ -279,17 +279,24 @@ static struct jz4780_bch *jz4780_bch_get(struct device_node *np)
{
struct platform_device *pdev;
struct jz4780_bch *bch;
+ int ret;
pdev = of_find_device_by_node(np);
- if (!pdev || !platform_get_drvdata(pdev))
+ if (!pdev)
return ERR_PTR(-EPROBE_DEFER);
-
- get_device(&pdev->dev);
+ if (!platform_get_drvdata(pdev)) {
+ ret = -EPROBE_DEFER;
+ goto err_put_device;
+ }
bch = platform_get_drvdata(pdev);
clk_prepare_enable(bch->clk);
return bch;
+
+err_put_device:
+ put_device(&pdev->dev);
+ return ERR_PTR(ret);
}
/**
--
2.7.4
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http://lists.infradead.org/mailman/listinfo/linux-mtd/
next reply other threads:[~2019-02-05 9:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-05 9:36 wen yang [this message]
2019-02-05 13:30 ` [PATCH] mtd: rawnand: jz4780: fix object reference leaks in jz4780_bch_get Miquel Raynal
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