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    Subject[PATCH 09/51] [GFS2] use an temp variable to reduce a spin_unlock
    Date
    From: Denis Cheng <crquan@gmail.com>

    this is more clear.

    Signed-off-by: Denis Cheng <crquan@gmail.com>
    Signed-off-by: David Teigland <teigland@redhat.com>
    Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

    diff --git a/fs/gfs2/locking/dlm/plock.c b/fs/gfs2/locking/dlm/plock.c
    index fba1f1d..1f7b038 100644
    --- a/fs/gfs2/locking/dlm/plock.c
    +++ b/fs/gfs2/locking/dlm/plock.c
    @@ -346,15 +346,16 @@ static ssize_t dev_write(struct file *file, const char __user *u, size_t count,

    static unsigned int dev_poll(struct file *file, poll_table *wait)
    {
    + unsigned int mask = 0;
    +
    poll_wait(file, &send_wq, wait);

    spin_lock(&ops_lock);
    - if (!list_empty(&send_list)) {
    - spin_unlock(&ops_lock);
    - return POLLIN | POLLRDNORM;
    - }
    + if (!list_empty(&send_list))
    + mask = POLLIN | POLLRDNORM;
    spin_unlock(&ops_lock);
    - return 0;
    +
    + return mask;
    }

    static const struct file_operations dev_fops = {
    --
    1.5.1.2
    -
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