4.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Bart Van Assche <bart.vanassche@xxxxxxx>
commit 65567e41219888feec72fee1de98ccf1efbbc16d upstream.
The rxe driver works as follows:
* The send queue, receive queue and completion queues are implemented as
circular buffers.
* ib_post_send() and ib_post_recv() calls are serialized through a spinlock.
* Removing elements from various queues happens from tasklet
context. Tasklets are guaranteed to run on at most one CPU. This serializes
access to these queues. See also rxe_completer(), rxe_requester() and
rxe_responder().
* rxe_completer() processes the skbs queued onto qp->resp_pkts.
* rxe_requester() handles the send queue (qp->sq.queue).
* rxe_responder() processes the skbs queued onto qp->req_pkts.
Since rxe_drain_req_pkts() processes qp->req_pkts, calling
rxe_drain_req_pkts() from rxe_requester() is racy. Hence this patch.
Reported-by: Moni Shoua <monis@xxxxxxxxxxxx>
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/sw/rxe/rxe_loc.h | 1 -
drivers/infiniband/sw/rxe/rxe_req.c | 9 +--------
drivers/infiniband/sw/rxe/rxe_resp.c | 2 +-
3 files changed, 2 insertions(+), 10 deletions(-)
--- a/drivers/infiniband/sw/rxe/rxe_loc.h
+++ b/drivers/infiniband/sw/rxe/rxe_loc.h
@@ -237,7 +237,6 @@ int rxe_srq_from_attr(struct rxe_dev *rx
void rxe_release(struct kref *kref);
-void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify);
int rxe_completer(void *arg);
int rxe_requester(void *arg);
int rxe_responder(void *arg);
--- a/drivers/infiniband/sw/rxe/rxe_req.c
+++ b/drivers/infiniband/sw/rxe/rxe_req.c
@@ -594,15 +594,8 @@ int rxe_requester(void *arg)
rxe_add_ref(qp);
next_wqe:
- if (unlikely(!qp->valid)) {
- rxe_drain_req_pkts(qp, true);
+ if (unlikely(!qp->valid || qp->req.state == QP_STATE_ERROR))
goto exit;
- }
-
- if (unlikely(qp->req.state == QP_STATE_ERROR)) {
- rxe_drain_req_pkts(qp, true);
- goto exit;
- }
if (unlikely(qp->req.state == QP_STATE_RESET)) {
qp->req.wqe_index = consumer_index(qp->sq.queue);
--- a/drivers/infiniband/sw/rxe/rxe_resp.c
+++ b/drivers/infiniband/sw/rxe/rxe_resp.c
@@ -1210,7 +1210,7 @@ static enum resp_states do_class_d1e_err
}
}
-void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
+static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
{
struct sk_buff *skb;