Commit Message
Greg KH
Oct. 24, 2022, 11:31 a.m. UTC
From: Bob Pearson <rpearsonhpe@gmail.com> [ 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> --- drivers/infiniband/sw/rxe/rxe_queue.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/infiniband/sw/rxe/rxe_queue.c b/drivers/infiniband/sw/rxe/rxe_queue.c index 6e6e023c1b45..03157de52f5f 100644 --- a/drivers/infiniband/sw/rxe/rxe_queue.c +++ b/drivers/infiniband/sw/rxe/rxe_queue.c @@ -112,23 +112,25 @@ static int resize_finish(struct rxe_queue *q, struct rxe_queue *new_q, unsigned int num_elem) { enum queue_type type = q->type; + u32 new_prod; u32 prod; u32 cons; if (!queue_empty(q, q->type) && (num_elem < queue_count(q, type))) return -EINVAL; - prod = queue_get_producer(new_q, type); + new_prod = queue_get_producer(new_q, type); + prod = queue_get_producer(q, type); cons = queue_get_consumer(q, type); - while (!queue_empty(q, type)) { - memcpy(queue_addr_from_index(new_q, prod), + while ((prod - cons) & q->index_mask) { + memcpy(queue_addr_from_index(new_q, new_prod), queue_addr_from_index(q, cons), new_q->elem_size); - prod = queue_next_index(new_q, prod); + new_prod = queue_next_index(new_q, new_prod); cons = queue_next_index(q, cons); } - new_q->buf->producer_index = prod; + new_q->buf->producer_index = new_prod; q->buf->consumer_index = cons; /* update private index copies */