On Wed, 3 Jan 2007 09:31:30 -0600
Corey Minyard <[email protected]> wrote:
> found:
> + smp_rmb();
> /* Note that each existing user holds a refcount to the interface. */
> kref_get(&intf->refcount);
>
> @@ -2761,6 +2763,7 @@
> kref_put(&intf->refcount, intf_free);
> } else {
> /* After this point the interface is legal to use. */
> + smp_wmb(); /* Keep memory order straight for RCU readers. */
> intf->intf_num = i;
> mutex_unlock(&ipmi_interfaces_mutex);
> call_smi_watchers(i, intf->si_dev);
> @@ -3924,6 +3927,8 @@
> /* Interface was not ready yet. */
> continue;
>
> + smp_rmb();
> +
It's nice to always have a comment explaining the use of open-coded
barriers. Because often the reader is left wondered what on earth it's
barriering against what on earth else.
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