[PATCH AUTOSEL for 4.4 103/115] scsi: core: scsi_get_device_flags_keyed(): Always return device flags

From: Sasha Levin
Date: Sat Mar 03 2018 - 18:00:43 EST


From: Bart Van Assche <bart.vanassche@xxxxxxx>

[ 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@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: Johannes Thumshirn <jthumshirn@xxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
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 60720e5b1ebc..74126b8591c8 100644
--- a/drivers/scsi/scsi_devinfo.c
+++ b/drivers/scsi/scsi_devinfo.c
@@ -589,17 +589,12 @@ 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;

--
2.14.1