From: Martin K. Petersen martin.petersen@oracle.com
commit 8acf608e602f6ec38b7cc37b04c80f1ce9a1a6cc upstream.
This reverts commit 20bd1d026aacc5399464f8328f305985c493cde3.
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: 20bd1d026aac ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/scsi/sd.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2396,7 +2396,6 @@ sd_read_write_protect_flag(struct scsi_d 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); @@ -2437,7 +2436,7 @@ sd_read_write_protect_flag(struct scsi_d "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");