2a2b16210b
Backport upstream solution for working around SPI controller maximum message sizes. Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
55 lines
1.5 KiB
Diff
55 lines
1.5 KiB
Diff
From 26f9bcad29a6c240881bd4efc90f16a9990dd6c2 Mon Sep 17 00:00:00 2001
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From: Michal Suchanek <hramrach@gmail.com>
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Date: Thu, 5 May 2016 17:31:55 -0700
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Subject: [PATCH 09/10] mtd: spi-nor: add read loop
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mtdblock and ubi do not handle the situation when read returns less data
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than requested. Loop in spi-nor until buffer is filled or an error is
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returned.
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Signed-off-by: Michal Suchanek <hramrach@gmail.com>
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Tested-by Cyrille Pitchen <cyrille.pitchen@atmel.com>
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Acked-by: Michal Suchanek <hramrach@gmail.com>
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Tested-by: Michal Suchanek <hramrach@gmail.com>
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---
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drivers/mtd/spi-nor/spi-nor.c | 25 +++++++++++++++++++------
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1 file changed, 19 insertions(+), 6 deletions(-)
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--- a/drivers/mtd/spi-nor/spi-nor.c
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+++ b/drivers/mtd/spi-nor/spi-nor.c
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@@ -890,14 +890,27 @@ static int spi_nor_read(struct mtd_info
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if (ret)
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return ret;
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- ret = nor->read(nor, from, len, buf);
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+ while (len) {
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+ ret = nor->read(nor, from, len, buf);
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+ if (ret == 0) {
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+ /* We shouldn't see 0-length reads */
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+ ret = -EIO;
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+ goto read_err;
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+ }
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+ if (ret < 0)
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+ goto read_err;
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- spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_READ);
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- if (ret < 0)
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- return ret;
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+ WARN_ON(ret > len);
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+ *retlen += ret;
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+ buf += ret;
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+ from += ret;
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+ len -= ret;
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+ }
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+ ret = 0;
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- *retlen += ret;
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- return 0;
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+read_err:
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+ spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_READ);
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+ return ret;
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}
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static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
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