From 159a4e83b4dba821a827ae32dfae4af216a5a183 Mon Sep 17 00:00:00 2001
From: "S.J.R. van Schaik" <stephan@whiteboxsystems.nl>
Date: Mon, 26 Jun 2017 12:18:44 +0200
Subject: [PATCH] spi: flash: correct wrap-around.

---
 source/drivers/spi_flash.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/drivers/spi_flash.c b/source/drivers/spi_flash.c
index bb1f533..efc62d4 100644
--- a/source/drivers/spi_flash.c
+++ b/source/drivers/spi_flash.c
@@ -130,7 +130,7 @@ static size_t spi_flash_write(struct flash_dev *dev, uint32_t addr,
 		spi_flash_addr(cmd, addr);
 
 		nbytes = min(len, 32);
-		nbytes = nbytes - ((addr + nbytes) & 0xff);
+		nbytes = min(nbytes, align_up(addr + 1, ilog2(256)) - addr);
 
 		memmove(cmd + 4, data, nbytes);
 		spi_tx_rx(spi_dev, NULL, 0, cmd, 4 + nbytes);