linux-kernel - [PATCH 4.4 10/49] scsi: ignore errors from scsi_dh_add

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Date:	Sun, 14 Aug 2016 22:23:10 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Johannes Thumshirn <jthumshirn@...e.com>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Laura Abbott <labbott@...hat.com>
Subject: [PATCH 4.4 10/49] scsi: ignore errors from scsi_dh_add_device()

4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Hannes Reinecke <hare@...e.de>

commit 221255aee67ec1c752001080aafec0c4e9390d95 upstream.

device handler initialisation might fail due to a number of
reasons. But as device_handlers are optional this shouldn't
cause us to disable the device entirely.
So just ignore errors from scsi_dh_add_device().

Reviewed-by: Johannes Thumshirn <jthumshirn@...e.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Cc: Laura Abbott <labbott@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/scsi_sysfs.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1058,11 +1058,12 @@ int scsi_sysfs_add_sdev(struct scsi_devi
 	}

 	error = scsi_dh_add_device(sdev);
-	if (error) {
+	if (error)
+		/*
+		 * device_handler is optional, so any error can be ignored
+		 */
 		sdev_printk(KERN_INFO, sdev,
 				"failed to add device handler: %d\n", error);
-		return error;
-	}

 	device_enable_async_suspend(&sdev->sdev_dev);
 	error = device_add(&sdev->sdev_dev);