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

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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: fe542396da ("[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>
This commit is contained in:
Xiang Chen 2020-01-09 09:12:24 +08:00 • committed by Greg Kroah-Hartman
parent a8d900e8ce
commit e61a25a897
1 changed files with 3 additions and 1 deletions
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4
drivers/scsi/sd.c
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@ -2195,8 +2195,10 @@ 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 */