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* [PATCH v5 2/2] mtd: rawnand: mtk: fix possible object reference leak
       [not found] <1549548020-24018-1-git-send-email-yellowriver2010@hotmail.com>
@ 2019-02-07 14:01 ` Wen Yang
  0 siblings, 0 replies; 1+ messages in thread
From: Wen Yang @ 2019-02-07 14:01 UTC (permalink / raw)
  To: miquel.raynal, bbrezillon, tudor.ambarus, richard, dwmw2,
	computersforpeace, marek.vasut
  Cc: alexandre.belloni, Wen Yang, nicolas.ferre, linux-kernel,
	ludovic.desroches, linux-mtd, linux-arm-kernel

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: 1d6b1e464950 ("mtd: mediatek: driver for MTK Smart Device")
Signed-off-by: Wen Yang <yellowriver2010@hotmail.com>
---
v5->v4: Keep one blank line.
v4->v3: Add people in Cc and remove all lines.
v3->v2: Avoid two times of calling grtform_get_drvdata()
v2->v1: Since there is the only one user, let's remove the err_put_device label.

 drivers/mtd/nand/raw/mtk_ecc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/raw/mtk_ecc.c b/drivers/mtd/nand/raw/mtk_ecc.c
index 6432bd7..05b0c19 100644
--- a/drivers/mtd/nand/raw/mtk_ecc.c
+++ b/drivers/mtd/nand/raw/mtk_ecc.c
@@ -267,11 +267,15 @@ static struct mtk_ecc *mtk_ecc_get(struct device_node *np)
 	struct mtk_ecc *ecc;
 
 	pdev = of_find_device_by_node(np);
-	if (!pdev || !platform_get_drvdata(pdev))
+	if (!pdev)
 		return ERR_PTR(-EPROBE_DEFER);
 
-	get_device(&pdev->dev);
 	ecc = platform_get_drvdata(pdev);
+	if (!ecc) {
+		put_device(&pdev->dev);
+		return ERR_PTR(-EPROBE_DEFER);
+	}
+
 	clk_prepare_enable(ecc->clk);
 	mtk_ecc_hw_init(ecc);
 
-- 
2.7.4


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     [not found] <1549548020-24018-1-git-send-email-yellowriver2010@hotmail.com>
2019-02-07 14:01 ` [PATCH v5 2/2] mtd: rawnand: mtk: fix possible object reference leak Wen Yang

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