diff --git a/arch/xtensa/platforms/iss/simdisk.c b/arch/xtensa/platforms/iss/simdisk.c
index f58a4e6..ede04cc 100644
--- a/arch/xtensa/platforms/iss/simdisk.c
+++ b/arch/xtensa/platforms/iss/simdisk.c
@@ -86,6 +86,7 @@
 		unsigned long io;
 
 		simc_lseek(dev->fd, offset, SEEK_SET);
+		READ_ONCE(*buffer);
 		if (write)
 			io = simc_write(dev->fd, buffer, nbytes);
 		else