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    Subject[PATCH 3.18 56/58] hippi: Fix a Fix a possible sleep-in-atomic bug in rr_close
    Date
    3.18-stable review patch.  If anyone has any objections, please let me know.

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

    From: Jia-Ju Bai <baijiaju1990@163.com>


    [ Upstream commit 6e266610eb6553cfb7e7eb5d11914bd01509c406 ]

    The driver may sleep under a spinlock.
    The function call path is:
    rr_close (acquire the spinlock)
    free_irq --> may sleep

    To fix it, free_irq is moved to the place without holding the spinlock.

    This bug is found by my static analysis tool(DSAC) and checked by my code review.

    Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/net/hippi/rrunner.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/net/hippi/rrunner.c
    +++ b/drivers/net/hippi/rrunner.c
    @@ -1381,8 +1381,8 @@ static int rr_close(struct net_device *d
    rrpriv->info_dma);
    rrpriv->info = NULL;

    - free_irq(pdev->irq, dev);
    spin_unlock_irqrestore(&rrpriv->lock, flags);
    + free_irq(pdev->irq, dev);

    return 0;
    }

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