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    Subject[ 033/120] net: ethernet: davinci_cpdma: decrease the desc count when cleaning up the remaining packets
    Date
    3.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------


    From: htbegin <hotforest@gmail.com>

    [ Upstream commit ffb5ba90017505a19e238e986e6d33f09e4df765 ]

    chan->count is used by rx channel. If the desc count is not updated by
    the clean up loop in cpdma_chan_stop, the value written to the rxfree
    register in cpdma_chan_start will be incorrect.

    Signed-off-by: Tao Hou <hotforest@gmail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/net/ethernet/ti/davinci_cpdma.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/drivers/net/ethernet/ti/davinci_cpdma.c
    +++ b/drivers/net/ethernet/ti/davinci_cpdma.c
    @@ -851,6 +851,7 @@ int cpdma_chan_stop(struct cpdma_chan *c

    next_dma = desc_read(desc, hw_next);
    chan->head = desc_from_phys(pool, next_dma);
    + chan->count--;
    chan->stats.teardown_dequeue++;

    /* issue callback without locks held */



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