linux-kernel - [PATCH 3.16 078/192] scsi: ses: do not add a device to an enclosure if enclosure_add

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Message-ID: <lsq.1507553064.583647346@decadent.org.uk>
Date:   Mon, 09 Oct 2017 13:44:24 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "James Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Maurizio Lombardi" <mlombard@...hat.com>,
        "Douglas Miller" <dougmill@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 3.16 078/192] scsi: ses: do not add a device to an
 enclosure if enclosure_add_links() fails.

3.16.49-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Maurizio Lombardi <mlombard@...hat.com>

commit 62e62ffd95539b9220894a7900a619e0f3ef4756 upstream.

The enclosure_add_device() function should fail if it can't create the
relevant sysfs links.

Signed-off-by: Maurizio Lombardi <mlombard@...hat.com>
Tested-by: Douglas Miller <dougmill@...ux.vnet.ibm.com>
Acked-by: James Bottomley <jejb@...ux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/misc/enclosure.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

--- a/drivers/misc/enclosure.c
+++ b/drivers/misc/enclosure.c
@@ -320,6 +320,7 @@ int enclosure_add_device(struct enclosur
 			 struct device *dev)
 {
 	struct enclosure_component *cdev;
+	int err;
 
 	if (!edev || component >= edev->components)
 		return -EINVAL;
@@ -329,12 +330,17 @@ int enclosure_add_device(struct enclosur
 	if (cdev->dev == dev)
 		return -EEXIST;
 
-	if (cdev->dev)
+	if (cdev->dev) {
 		enclosure_remove_links(cdev);
-
-	put_device(cdev->dev);
+		put_device(cdev->dev);
+	}
 	cdev->dev = get_device(dev);
-	return enclosure_add_links(cdev);
+	err = enclosure_add_links(cdev);
+	if (err) {
+		put_device(cdev->dev);
+		cdev->dev = NULL;
+	}
+	return err;
 }
 EXPORT_SYMBOL_GPL(enclosure_add_device);