Re: [Xen-devel] evtchn_resize_ring() serialization

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.05.16 at 15:14, <david.vrabel@xxxxxxxxxx> wrote:
> On 04/05/16 14:08, Jan Beulich wrote:
>> David,
>> 
>> in the course of putting together the fix just sent I got puzzled by the
>> apparent raciness of the initial part of evtchn_resize_ring(). Is it
>> intentional that the function relies on being implicitly serialized via the
>> bind mutex?
> 
> Yes.
> 
> Although, I'm not sure I'd call it "implicit", as I think the bind_mutex
> rather explicitly serializes bind operations (which may include resizing
> the ring).

Well, that's only if you assume that re-sizing is something which can
only ever happen in the context of binding. As said - I had looked at
the function in isolation first; nothing says it's a helper for just one
very specific operation.

Jan


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