drm/radeon: off by one in check_reg() functions

This off by one range check was copy and pasted a couple places.
It's not really harmful, but we should fix it anyway.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/r600_cs.c b/drivers/gpu/drm/radeon/r600_cs.c
index db8ef1905d5f..cf83aa05a684 100644
--- a/drivers/gpu/drm/radeon/r600_cs.c
+++ b/drivers/gpu/drm/radeon/r600_cs.c
@@ -915,12 +915,11 @@ static inline int r600_cs_check_reg(struct radeon_cs_parser *p, u32 reg, u32 idx
 {
         struct r600_cs_track *track = (struct r600_cs_track *)p->track;
         struct radeon_cs_reloc *reloc;
-        u32 last_reg = ARRAY_SIZE(r600_reg_safe_bm);
         u32 m, i, tmp, *ib;
         int r;
 
         i = (reg >> 7);
-        if (i > last_reg) {
+        if (i >= ARRAY_SIZE(r600_reg_safe_bm)) {
                 dev_warn(p->dev, "forbidden register 0x%08x at %d\n", reg, idx);
                 return -EINVAL;
         }