scsi: sd: Clear sdkp->protection_type if disk is reformatted without PI

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>

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index cea625906440ab6f50f16006e4056196b7cb4f99..65ce10c7989ca3a36fab578042b6281e566d47f1 100644 (file)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2211,8 +2211,10 @@ static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer
        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 */