[PATCH 5.4 086/203] scsi: sd: Clear sdkp->protection_type if disk is reformatted without PI

Greg Kroah-Hartman
2020-01-16T23:23:16Z

From: Xiang Chen <chenxiang66@hisilicon.com>

commit 465f4edaecc6c37f81349233e84d46246bcac11a upstream.

If an attached disk with protection information enabled is reformatted
to Type 0 the revalidation code does not clear the original protection
type and subsequent accesses will keep setting RDPROTECT/WRPROTECT.

Set the protection type to 0 if the disk reports PROT_EN=0 in READ
CAPACITY(16).

[mkp: commit desc]

Fixes: fe542396da73 ("[SCSI] sd: Ensure we correctly disable devices with unknown protection type")
Link: https://lore.kernel.org/r/1578532344-101668-1-git-send-email-chenxiang66@hisilicon.com
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/scsi/sd.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2192,8 +2192,10 @@ static int sd_read_protection_type(struc
u8 type;
int ret = 0;

- if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
+ if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) {
+ sdkp->protection_type = 0;
return ret;
+ }

type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */