[scsi-0121]scsi: sd: Clear sdkp->protection_type if disk is reformatted without PI

[Fred Kimmy]

[Bug Description]
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).

[Steps to Reproduce]
1.Format a SAS disk as DIF disk;
2.insmod SAS with DIF/DIX enable;
3. Format the DIF disk as a normal disk;

[Actual Results]
IO error occurs;

[Expected Results]
Without exception

[Reproducibility]
Inevitably

[Additional information]
Hardware: D06
Firmware: NA
Kernel: NA

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

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

[dann frazier (dannf)]

This patch is queued for stable, so should normally flow into all supported streams.

[Ike Panhc (ikepanhc)]

In focal kernel since 5.4.0-13.16

[Ike Panhc (ikepanhc)]

In bionic kernel since 4.15.0-89.89

[Ike Panhc (ikepanhc)]

In HWE 5.3 kernel already.