From: Michal Suchanek <hramrach@gmail.com>
Date: Fri, 6 May 2016 00:31:56 +0000 (-0700)
Subject: mtd: m25p80: read in spi_max_transfer_size chunks
X-Git-Tag: v4.8-rc1~57^2~23
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=95193796256cfce16e5d881318e15b6b04062c15;p=karo-tx-linux.git

mtd: m25p80: read in spi_max_transfer_size chunks

Take into account transfer size limitation of SPI master.

Signed-off-by: Michal Suchanek <hramrach@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Michal Suchanek <hramrach@gmail.com>
Tested-by: Michal Suchanek <hramrach@gmail.com>
---

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index eab46d211ae6..9cf7fcd28034 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -172,7 +172,7 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
 
 	t[1].rx_buf = buf;
 	t[1].rx_nbits = m25p80_rx_nbits(nor);
-	t[1].len = len;
+	t[1].len = min(len, spi_max_transfer_size(spi));
 	spi_message_add_tail(&t[1], &m);
 
 	ret = spi_sync(spi, &m);