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    Subject[PATCH 4.4 132/312] mtd: nand: denali: add missing nand_release() call in denali_remove()
    Date
    From: Boris Brezillon <boris.brezillon@free-electrons.com>

    commit 320092a05dab2f44819c42f33d6b51efb6c474f2 upstream.

    Unregister the NAND device from the NAND subsystem when removing a denali
    NAND controller, otherwise the MTD attached to the NAND device is still
    exposed by the MTD layer, and accesses to this device will likely crash
    the system.

    Fixes: 2a0a288ec258 ("mtd: denali: split the generic driver and PCI layer")
    Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
    Acked-by: Dinh Nguyen <dinguyen@opensource.altera.com>
    Signed-off-by: Brian Norris <computersforpeace@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/mtd/nand/denali.c | 11 +++++++++--
    1 file changed, 9 insertions(+), 2 deletions(-)

    --- a/drivers/mtd/nand/denali.c
    +++ b/drivers/mtd/nand/denali.c
    @@ -1622,9 +1622,16 @@ EXPORT_SYMBOL(denali_init);
    /* driver exit point */
    void denali_remove(struct denali_nand_info *denali)
    {
    + /*
    + * Pre-compute DMA buffer size to avoid any problems in case
    + * nand_release() ever changes in a way that mtd->writesize and
    + * mtd->oobsize are not reliable after this call.
    + */
    + int bufsize = denali->mtd.writesize + denali->mtd.oobsize;
    +
    + nand_release(&denali->mtd);
    denali_irq_cleanup(denali->irq, denali);
    - dma_unmap_single(denali->dev, denali->buf.dma_buf,
    - denali->mtd.writesize + denali->mtd.oobsize,
    + dma_unmap_single(denali->dev, denali->buf.dma_buf, bufsize,
    DMA_BIDIRECTIONAL);
    }
    EXPORT_SYMBOL(denali_remove);

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