scsi: core: scsi_get_device_flags_keyed(): Always return device flags

[ 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
index 26e6b05..9545c40 100644 (file)
--- 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 *sdev,
                                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;