linux-kernel - [PATCH 4.15 099/128] scsi: core: scsi_get_device_flags

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Message-Id: <20180316152341.489161158@linuxfoundation.org>
Date:   Fri, 16 Mar 2018 16:24:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bart Van Assche <bart.vanassche@....com>,
        Christoph Hellwig <hch@....de>,
        Hannes Reinecke <hare@...e.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.15 099/128] scsi: core: scsi_get_device_flags_keyed(): Always return device flags

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

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

From: Bart Van Assche <bart.vanassche@....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@....com>
Cc: Christoph Hellwig <hch@....de>
Cc: Hannes Reinecke <hare@...e.com>
Cc: Johannes Thumshirn <jthumshirn@...e.de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/scsi_devinfo.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

--- a/drivers/scsi/scsi_devinfo.c
+++ b/drivers/scsi/scsi_devinfo.c
@@ -590,17 +590,12 @@ blist_flags_t scsi_get_device_flags_keye
 				int key)
 {
 	struct scsi_dev_info_list *devinfo;
-	int err;
 
 	devinfo = scsi_dev_info_list_find(vendor, model, key);
 	if (!IS_ERR(devinfo))
 		return devinfo->flags;
 
-	err = PTR_ERR(devinfo);
-	if (err != -ENOENT)
-		return err;
-
-	/* nothing found, return nothing */
+	/* key or device not found: return nothing */
 	if (key != SCSI_DEVINFO_GLOBAL)
 		return 0;