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    Subject[PATCH] spi: Fix WARN when removing spi-fsl-spi module
    If CPM mode is not used, the fsl_dummy_rx variable is never allocated.  When
    the cleanup attempts to free it, the reference count is zero and a WARN is
    generated. The same CPM mode check used in the initialize is applied to the
    free as well.

    Tested on 2.6.33 with the previous spi_mpc8xxx driver. The renamed
    spi-fsl-spi driver looks to have the same problem.

    Signed-off-by: Jeff Harris <>
    drivers/spi/spi-fsl-spi.c | 3 +++
    1 files changed, 3 insertions(+), 0 deletions(-)

    diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
    index d240755..24cacff 100644
    --- a/drivers/spi/spi-fsl-spi.c
    +++ b/drivers/spi/spi-fsl-spi.c
    @@ -825,6 +825,9 @@ static void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi)
    struct device *dev = mspi->dev;

    + if (!(mspi->flags & SPI_CPM_MODE))
    + return;
    dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE);
    dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);

     \ /
      Last update: 2011-09-23 17:53    [W:0.018 / U:0.788 seconds]
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