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    Subject[PATCH 5.15 017/846] mtd: rawnand: davinci: Avoid duplicated page read
    Date
    From: Paul Cercueil <paul@crapouillou.net>

    commit 9c9d709965385de5a99f84b14bd5860e1541729e upstream.

    The function nand_davinci_read_page_hwecc_oob_first() first reads the
    OOB data, extracts the ECC information, programs the ECC hardware before
    reading the actual data in a loop.

    Right after the OOB data was read, it called nand_read_page_op() to
    reset the read cursor to the beginning of the page. This caused the
    first page to be read twice: in that call, and later in the loop.

    Address that issue by changing the call to nand_read_page_op() to
    nand_change_read_column_op(), which will only reset the read cursor.

    Cc: <stable@vger.kernel.org> # v5.2
    Fixes: a0ac778eb82c ("mtd: rawnand: ingenic: Add support for the JZ4740")
    Signed-off-by: Paul Cercueil <paul@crapouillou.net>
    Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
    Link: https://lore.kernel.org/linux-mtd/20211016132228.40254-2-paul@crapouillou.net
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/mtd/nand/raw/davinci_nand.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/drivers/mtd/nand/raw/davinci_nand.c
    +++ b/drivers/mtd/nand/raw/davinci_nand.c
    @@ -401,7 +401,8 @@ static int nand_davinci_read_page_hwecc_
    if (ret)
    return ret;

    - ret = nand_read_page_op(chip, page, 0, NULL, 0);
    + /* Move read cursor to start of page */
    + ret = nand_change_read_column_op(chip, 0, NULL, 0, false);
    if (ret)
    return ret;


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