RDMA/rxe: Fix resize_finish() in rxe_queue.c

RDMA/rxe: Fix resize_finish() in rxe_queue.c

BugLink: https://bugs.launchpad.net/bugs/1996825
[ Upstream commit fda5d0cf8aef12f0a4f714a96a4b2fce039a3e55 ]

Currently in resize_finish() in rxe_queue.c there is a loop which copies
the entries in the original queue into a newly allocated queue.  The
termination logic for this loop is incorrect. The call to
queue_next_index() updates cons but has no effect on whether the queue is
empty. So if the queue starts out empty nothing is copied but if it is not
then the loop will run forever. This patch changes the loop to compare the
value of cons to the original producer index.

Fixes: ae6e843fe08d0 ("RDMA/rxe: Add memory barriers to kernel queues")
Link: https://lore.kernel.org/r/20220825221446.6512-1-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>