target/linux/generic/pending-4.19/450-mtd-spi-nor-allow-NOR-driver-to-write-fewer-bytes-th.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Thu, 22 Feb 2018 11:11:57 +0100
   3 Subject: [PATCH] mtd: spi-nor: allow NOR driver to write fewer bytes than
   4  requested
   5
   6 The write size can be constrained by the maximum message/transfer size
   7 of the SPI controller. Only check for ret = 0 to avoid an infinite loop.
   8
   9 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  10 ---
  11
  12 --- a/drivers/mtd/spi-nor/spi-nor.c
  13 +++ b/drivers/mtd/spi-nor/spi-nor.c
  14 @@ -1457,7 +1457,7 @@ static int spi_nor_write(struct mtd_info
  15
  16                 write_enable(nor);
  17                 ret = nor->write(nor, addr, page_remain, buf + i);
  18 -               if (ret < 0)
  19 +               if (ret <= 0)
  20                         goto write_err;
  21                 written = ret;
  22
  23 @@ -1466,13 +1466,6 @@ static int spi_nor_write(struct mtd_info
  24                         goto write_err;
  25                 *retlen += written;
  26                 i += written;
  27 -               if (written != page_remain) {
  28 -                       dev_err(nor->dev,
  29 -                               "While writing %zu bytes written %zd bytes\n",
  30 -                               page_remain, written);
  31 -                       ret = -EIO;
  32 -                       goto write_err;
  33 -               }
  34         }
  35
  36  write_err: