diff --git a/arch/loongarch/include/asm/io.h b/arch/loongarch/include/asm/io.h
index 87a88eb792c1f422051f8188a04143885a413e73..5207da7c2a822f5fa50a5865de79b91aa186ba95 100644
--- a/arch/loongarch/include/asm/io.h
+++ b/arch/loongarch/include/asm/io.h
@@ -41,7 +41,7 @@ static inline void __iomem *ioremap_prot(phys_addr_t offset, unsigned long size,
 #define ioremap(offset, size)		\
 	ioremap_prot((offset), (size), pgprot_val(PAGE_KERNEL_SUC))
 
-#define iounmap(addr) 			do { } while (0)
+#define iounmap(addr)	((void)(addr))
 
 #endif
 
diff --git a/drivers/gpu/drm/loongson/lsdc_i2c.c b/drivers/gpu/drm/loongson/lsdc_i2c.c
index 925bb8b866ad92ea31c5b7da7cc5c851da1b6d15..ea64bd097a5997bcac1280a4e80d7ba051af4508 100644
--- a/drivers/gpu/drm/loongson/lsdc_i2c.c
+++ b/drivers/gpu/drm/loongson/lsdc_i2c.c
@@ -9,6 +9,7 @@
  */
 
 #include <linux/i2c.h>
+#include <linux/io.h>
 
 #include <drm/drm_print.h>
 #include <drm/drm_device.h>