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Revert "scsi: sd: Keep disk read-only when re-reading partition" 

This reverts commit 20bd1d026a.

This patch introduced regressions for devices that come online in
read-only state and subsequently switch to read-write.

Given how the partition code is currently implemented it is not
possible to persist the read-only flag across a device revalidate
call. This may need to get addressed in the future since it is common
for user applications to proactively call BLKRRPART.

Reverting this commit will re-introduce a regression where a
device-initiated revalidate event will cause the admin state to be
forgotten. A separate patch will address this issue.

Fixes: 20bd1d026a ("scsi: sd: Keep disk read-only when re-reading partition")
Cc: <stable@vger.kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Martin K. Petersen 2019-05-20 10:57:18 -04:00
parent d0c0d90233
commit 8acf608e60
1 changed files with 1 additions and 2 deletions
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3
drivers/scsi/sd.c
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@ -2603,7 +2603,6 @@ sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
int res;
struct scsi_device *sdp = sdkp->device;
struct scsi_mode_data data;
int disk_ro = get_disk_ro(sdkp->disk);
int old_wp = sdkp->write_prot;
set_disk_ro(sdkp->disk, 0);
@ -2644,7 +2643,7 @@ sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
"Test WP failed, assume Write Enabled\n");
} else {
sdkp->write_prot = ((data.device_specific & 0x80) != 0);
set_disk_ro(sdkp->disk, sdkp->write_prot || disk_ro);
set_disk_ro(sdkp->disk, sdkp->write_prot);
if (sdkp->first_scan || old_wp != sdkp->write_prot) {
sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
sdkp->write_prot ? "on" : "off");