diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index d0b154d13f44..2c64bf4cdf0d 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -551,9 +551,13 @@ static void qm_mb_write(struct hisi_qm *qm, const void *src)
 	}
 
 #if IS_ENABLED(CONFIG_ARM64)
+	/*
+	 * The dmb oshst instruction ensures that the data in the
+	 * mailbox is written before it is sent to the hardware.
+	 */
 	asm volatile("ldp %0, %1, %3\n"
-		     "stp %0, %1, %2\n"
 		     "dmb oshst\n"
+		     "stp %0, %1, %2\n"
 		     : "=&r" (tmp0),
 		       "=&r" (tmp1),
 		       "+Q" (*((char __iomem *)fun_base))