diff --git a/msm/sde/sde_encoder.c b/msm/sde/sde_encoder.c
index 69074f17..def9e568 100644
--- a/msm/sde/sde_encoder.c
+++ b/msm/sde/sde_encoder.c
@@ -635,8 +635,8 @@ int sde_encoder_helper_unregister_irq(struct sde_encoder_phys *phys_enc,
 	struct sde_encoder_irq *irq;
 	int ret;
 
-	if (!phys_enc) {
-		SDE_ERROR("invalid encoder\n");
+	if (!phys_enc || intr_idx >= INTR_IDX_MAX) {
+		SDE_ERROR("invalid params\n");
 		return -EINVAL;
 	}
 	irq = &phys_enc->irq[intr_idx];