Commit f61de8ef authored Oct 28, 2016 by Heiner Kallweit Committed by Greg Kroah-Hartman Jul 22, 2018

mtd: m25p80: consider max message size in m25p80_read



commit 9e276de6a367cde07c1a63522152985d4e5cca8b upstream.

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>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 78a65505

drivers/mtd/devices/m25p80.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -172,7 +172,8 @@ 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 = 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);