Re: [PATCH 1/3] xen-gnt: prevent adding duplicate gnt callbacks

[David Vrabel <david.vrabel@citrix.com>]

On 31/07/13 16:00, Roger Pau Monne wrote:
> With the current implementation, the callback in the tail of the list
> can be added twice, because the check done in
> gnttab_request_free_callback is bogus, callback->next can be NULL if
> it is the last callback in the list. If we add the same callback twice
> we end up with an infinite loop, were callback == callback->next.
> 
> Replace this check with a proper one that iterates over the list to
> see if the callback has already been added.

As a minimal fix suitable for stable,

Reviewed-by: David Vrabel <david.vrabel@citrix.com>

David