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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Bart Van Assche <bart.vanassche@wdc.com>,
        Christoph Hellwig <hch@lst.de>,
        Hannes Reinecke <hare@suse.com>,
        Johannes Thumshirn <jthumshirn@suse.de>,
        "Martin K . Petersen" <martin.petersen@oracle.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 204/219] scsi: core:
 scsi_get_device_flags_keyed(): Always return device flags
Thread-Topic: [PATCH AUTOSEL for 4.9 204/219] scsi: core:
 scsi_get_device_flags_keyed(): Always return device flags
Thread-Index: AQHTsz8nvFEeqYPsU024Z2fqc8Mrxg==
Date:   Sat, 3 Mar 2018 22:29:55 +0000
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From: Bart Van Assche <bart.vanassche@wdc.com>

[ Upstream commit a44c9d36509c83cf64f33b93f6ab2e63822c01eb ]

Since scsi_get_device_flags_keyed() callers do not check whether or not
the returned value is an error code, change that function such that it
returns a flags value even if the 'key' argument is invalid.  Note:
since commit 28a0bc4120d3 ("scsi: sd: Implement blacklist option for
WRITE SAME w/ UNMAP") bit 31 is a valid device information flag so
checking whether bit 31 is set in the return value is not sufficient to
tell the difference between an error code and a flags value.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/scsi/scsi_devinfo.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
index 26e6b05d05fc..9545c40daa5e 100644
--- a/drivers/scsi/scsi_devinfo.c
+++ b/drivers/scsi/scsi_devinfo.c
@@ -596,17 +596,12 @@ int scsi_get_device_flags_keyed(struct scsi_device *s=
dev,
 				int key)
 {
 	struct scsi_dev_info_list *devinfo;
-	int err;
=20
 	devinfo =3D scsi_dev_info_list_find(vendor, model, key);
 	if (!IS_ERR(devinfo))
 		return devinfo->flags;
=20
-	err =3D PTR_ERR(devinfo);
-	if (err !=3D -ENOENT)
-		return err;
-
-	/* nothing found, return nothing */
+	/* key or device not found: return nothing */
 	if (key !=3D SCSI_DEVINFO_GLOBAL)
 		return 0;
=20
--=20
2.14.1