target/linux/brcm63xx/patches-4.4/001-4.11-01-mtd-m25p80-consider-max-message-size-in-m25p80_read.patch

   1 From 80a79a889ce5df16c5261ab2f1e8e63b94b78102 Mon Sep 17 00:00:00 2001
   2 From: Heiner Kallweit <hkallweit1@gmail.com>
   3 Date: Fri, 28 Oct 2016 07:58:46 +0200
   4 Subject: [PATCH 1/8] mtd: m25p80: consider max message size in m25p80_read
   5
   6 Consider a message size limit when calculating the maximum amount
   7 of data that can be read.
   8
   9 The message size limit has been introduced with 4.9, so cc it
  10 to stable.
  11
  12 Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
  13 Cc: <stable@vger.kernel.org> # 4.9.x
  14 Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
  15 ---
  16  drivers/mtd/devices/m25p80.c | 3 ++-
  17  1 file changed, 2 insertions(+), 1 deletion(-)
  18
  19 --- a/drivers/mtd/devices/m25p80.c
  20 +++ b/drivers/mtd/devices/m25p80.c
  21 @@ -172,7 +172,8 @@ static ssize_t m25p80_read(struct spi_no
  22
  23         t[1].rx_buf = buf;
  24         t[1].rx_nbits = m25p80_rx_nbits(nor);
  25 -       t[1].len = min(len, spi_max_transfer_size(spi));
  26 +       t[1].len = min3(len, spi_max_transfer_size(spi),
  27 +                       spi_max_message_size(spi) - t[0].len);
  28         spi_message_add_tail(&t[1], &m);
  29
  30         ret = spi_sync(spi, &m);