[rds-devel] [PATCH net 1/3] RDS: TCP: Add/use rds_tcp_reset_callbacks to reset tcp socket safely

[Santosh Shilimkar]

On 6/4/2016 1:59 PM, Sowmini Varadhan wrote:
> When rds_tcp_accept_one() has to replace the existing tcp socket
> with a newer tcp socket (duelling-syn resolution), it must lock_sock()
> to suppress the rds_tcp_data_recv() path while callbacks are being
> changed.  Also, existing RDS datagram reassembly state must be reset,
> so that the next datagram on the new socket  does not have corrupted
> state. Similarly when resetting the newly accepted socket, appropriate
> locks and synchronization is needed.
>
> This commit ensures correct synchronization by invoking
> kernel_sock_shutdown to reset a newly accepted sock, and by taking
> appropriate lock_sock()s (for old and new sockets) when resetting
> existing callbacks.
>
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan at oracle.com>
> ---
Acked-by: Santosh Shilimkar <santosh.shilimkar at oracle.com>