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From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 22 Feb 2018 11:11:57 +0100
Subject: [PATCH] mtd: spi-nor: allow NOR driver to write fewer bytes than
 requested

The write size can be constrained by the maximum message/transfer size
of the SPI controller. Only check for ret = 0 to avoid an infinite loop.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1377,7 +1377,7 @@ static int spi_nor_write(struct mtd_info
 
                write_enable(nor);
                ret = nor->write(nor, addr, page_remain, buf + i);
-               if (ret < 0)
+               if (ret <= 0)
                        goto write_err;
                written = ret;
 
@@ -1386,13 +1386,6 @@ static int spi_nor_write(struct mtd_info
                        goto write_err;
                *retlen += written;
                i += written;
-               if (written != page_remain) {
-                       dev_err(nor->dev,
-                               "While writing %zu bytes written %zd bytes\n",
-                               page_remain, written);
-                       ret = -EIO;
-                       goto write_err;
-               }
        }
 
 write_err: