[SCSI] scsi_debug: clear correct memory region when LBPRZ is enabled

The function unmap_region() clears memory region specified as the logical
block address and the number of logical blocks in ramdisk storage
(fake_storep) if lbpu and lbprz module parameters are enabled.

In the while loop of unmap_region(), it advances optimal unmap granularity
in logical blocks.  But it only clears one logical block at LBA 'block' per
loop iteration.  And furthermore, the 'block' is not pointing to a logical
block address which should be cleared, it is a index of probisioning map
(map_storep).

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 5c321409fff3..4b5d3887ff47 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -2059,8 +2059,9 @@ static void unmap_region(sector_t lba, unsigned int len)
                         clear_bit(block, map_storep);
                         if (scsi_debug_lbprz)
                                 memset(fake_storep +
-                                       block * scsi_debug_sector_size, 0,
-                                       scsi_debug_sector_size);
+                                       lba * scsi_debug_sector_size, 0,
+                                       scsi_debug_sector_size *
+                                       scsi_debug_unmap_granularity);
                 }
                 lba += granularity - rem;
         }