Re: [PATCH rdma-RC] IB/cm: Fix sleeping while atomic when creating AH from WC

On Mon, Oct 12, 2015 at 7:42 PM, Hefty, Sean [off-list ref] wrote:

quoted

When IP based addressing was introduced, ib_create_ah_from_wc was
changed in order to support a suitable AH. Since this AH should
now contains the DMAC (which isn't a simple derivative of the GID).
In order to find the DMAC, an ARP should sometime be sent. This ARP
is a sleeping context.

Wait - are you saying that the CM may now be waiting for an ARP response before it can send a message?

ib_create_ah_from_wc needs to resolve the DMAC in order to create the
AH (this may result sending an ARP and waiting for response).
CM uses this function (which is now sleepable).

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