linux-kernel - [PATCH AUTOSEL for 4.4 078/162] scsi: sun

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Date:   Mon, 9 Apr 2018 00:28:40 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Johan Hovold <johan@...nel.org>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.4 078/162] scsi: sun_esp: fix device reference
 leaks

From: Johan Hovold <johan@...nel.org>

[ Upstream commit f62f9ffdb5ef683ef8cffb43932fa72cc3713e94 ]

Make sure to drop the reference to the dma device taken by
of_find_device_by_node() on probe errors and on driver unbind.

Fixes: 334ae614772b ("sparc: Kill SBUS DVMA layer.")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/scsi/sun_esp.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sun_esp.c b/drivers/scsi/sun_esp.c
index 7b6d4c2087d7..747ee64a78e1 100644
--- a/drivers/scsi/sun_esp.c
+++ b/drivers/scsi/sun_esp.c
@@ -566,6 +566,7 @@ static int esp_sbus_probe(struct platform_device *op)
 	struct device_node *dp = op->dev.of_node;
 	struct platform_device *dma_of = NULL;
 	int hme = 0;
+	int ret;
 
 	if (dp->parent &&
 	    (!strcmp(dp->parent->name, "espdma") ||
@@ -580,7 +581,11 @@ static int esp_sbus_probe(struct platform_device *op)
 	if (!dma_of)
 		return -ENODEV;
 
-	return esp_sbus_probe_one(op, dma_of, hme);
+	ret = esp_sbus_probe_one(op, dma_of, hme);
+	if (ret)
+		put_device(&dma_of->dev);
+
+	return ret;
 }
 
 static int esp_sbus_remove(struct platform_device *op)
@@ -613,6 +618,8 @@ static int esp_sbus_remove(struct platform_device *op)
 
 	dev_set_drvdata(&op->dev, NULL);
 
+	put_device(&dma_of->dev);
+
 	return 0;
 }
 
-- 
2.15.1