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[SCSI] scsi_debug: prohibit scsi_debug_unmap_granularity == scsi_debug_unmap_alignment

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scsi_debug prohibits setting scsi_debug_unmap_alignment to be greater
than scsi_debug_unmap_granularity.  But setting them to be the same value
is not prohibited.  In this case, the only difference with
scsi_debug_unmap_alignment == 0 is the logical blocks from 0 to
scsi_debug_unmap_alignment - 1 cannot be unmapped.  But the difference is
not properly handled in the current code.

So this prohibits such unusual setting.

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>
This commit is contained in:
Akinobu Mita 2013-04-16 22:11:56 +09:00 committed by James Bottomley
parent 9ed8d3dc5b
commit ac17078ae6
1 changed files with 3 additions and 2 deletions
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5
drivers/scsi/scsi_debug.c
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@ -3413,9 +3413,10 @@ static int __init scsi_debug_init(void)
clamp(scsi_debug_unmap_granularity, 1U, 0xffffffffU);
if (scsi_debug_unmap_alignment &&
scsi_debug_unmap_granularity < scsi_debug_unmap_alignment) {
scsi_debug_unmap_granularity <=
scsi_debug_unmap_alignment) {
printk(KERN_ERR
"%s: ERR: unmap_granularity < unmap_alignment\n",
"%s: ERR: unmap_granularity <= unmap_alignment\n",
__func__);
return -EINVAL;
}