[PATCH 5.4 103/132] drm/i915/gvt: do not check len & max_len for lri

[Greg Kroah-Hartman]

From: Yan Zhao <yan.y.zhao@xxxxxxxxx>

commit dbafc67307ec06036b25b223a251af03fe07969a upstream.

lri ususally of variable len and far exceeding 127 dwords.

Fixes: 00a33be40634 ("drm/i915/gvt: Add valid length check for MI variable commands")
Signed-off-by: Yan Zhao <yan.y.zhao@xxxxxxxxx>
Acked-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
Signed-off-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/20200304095121.21609-1-yan.y.zhao@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/i915/gvt/cmd_parser.c |   12 ------------
 1 file changed, 12 deletions(-)

--- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
+++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
@@ -963,18 +963,6 @@ static int cmd_handler_lri(struct parser
 	int i, ret = 0;
 	int cmd_len = cmd_length(s);
 	struct intel_gvt *gvt = s->vgpu->gvt;
-	u32 valid_len = CMD_LEN(1);
-
-	/*
-	 * Official intel docs are somewhat sloppy , check the definition of
-	 * MI_LOAD_REGISTER_IMM.
-	 */
-	#define MAX_VALID_LEN 127
-	if ((cmd_len < valid_len) || (cmd_len > MAX_VALID_LEN)) {
-		gvt_err("len is not valid:  len=%u  valid_len=%u\n",
-			cmd_len, valid_len);
-		return -EFAULT;
-	}
 
 	for (i = 1; i < cmd_len; i += 2) {
 		if (IS_BROADWELL(gvt->dev_priv) && s->ring_id != RCS0) {