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From 80a79a889ce5df16c5261ab2f1e8e63b94b78102 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Fri, 28 Oct 2016 07:58:46 +0200
Subject: [PATCH 1/8] mtd: m25p80: consider max message size in m25p80_read
Consider a message size limit when calculating the maximum amount
of data that can be read.
The message size limit has been introduced with 4.9, so cc it
to stable.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Cc: <stable@vger.kernel.org> # 4.9.x
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
drivers/mtd/devices/m25p80.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -172,7 +172,8 @@ static ssize_t m25p80_read(struct spi_no
t[1].rx_buf = buf;
t[1].rx_nbits = m25p80_rx_nbits(nor);
- t[1].len = min(len, spi_max_transfer_size(spi));
+ t[1].len = min3(len, spi_max_transfer_size(spi),
+ spi_max_message_size(spi) - t[0].len);
spi_message_add_tail(&t[1], &m);
ret = spi_sync(spi, &m);
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