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Diffstat (limited to 'net/9p/trans_rdma.c')
-rw-r--r--net/9p/trans_rdma.c22
1 files changed, 12 insertions, 10 deletions
diff --git a/net/9p/trans_rdma.c b/net/9p/trans_rdma.c
index 274a9c1d3c3d..ad8dc331574b 100644
--- a/net/9p/trans_rdma.c
+++ b/net/9p/trans_rdma.c
@@ -73,7 +73,7 @@
* @sq_depth: The depth of the Send Queue
* @sq_sem: Semaphore for the SQ
* @rq_depth: The depth of the Receive Queue.
- * @rq_count: Count of requests in the Receive Queue.
+ * @rq_sem: Semaphore for the RQ
* @addr: The remote peer's address
* @req_lock: Protects the active request list
* @cm_done: Completion event for connection management tracking
@@ -98,7 +98,7 @@ struct p9_trans_rdma {
int sq_depth;
struct semaphore sq_sem;
int rq_depth;
- atomic_t rq_count;
+ struct semaphore rq_sem;
struct sockaddr_in addr;
spinlock_t req_lock;
@@ -341,8 +341,8 @@ static void cq_comp_handler(struct ib_cq *cq, void *cq_context)
switch (c->wc_op) {
case IB_WC_RECV:
- atomic_dec(&rdma->rq_count);
handle_recv(client, rdma, c, wc.status, wc.byte_len);
+ up(&rdma->rq_sem);
break;
case IB_WC_SEND:
@@ -441,12 +441,14 @@ static int rdma_request(struct p9_client *client, struct p9_req_t *req)
* outstanding request, so we must keep a count to avoid
* overflowing the RQ.
*/
- if (atomic_inc_return(&rdma->rq_count) <= rdma->rq_depth) {
- err = post_recv(client, rpl_context);
- if (err)
- goto err_free1;
- } else
- atomic_dec(&rdma->rq_count);
+ if (down_interruptible(&rdma->rq_sem))
+ goto error; /* FIXME : -EINTR instead */
+
+ err = post_recv(client, rpl_context);
+ if (err) {
+ p9_debug(P9_DEBUG_FCALL, "POST RECV failed\n");
+ goto err_free1;
+ }
/* remove posted receive buffer from request structure */
req->rc = NULL;
@@ -537,7 +539,7 @@ static struct p9_trans_rdma *alloc_rdma(struct p9_rdma_opts *opts)
spin_lock_init(&rdma->req_lock);
init_completion(&rdma->cm_done);
sema_init(&rdma->sq_sem, rdma->sq_depth);
- atomic_set(&rdma->rq_count, 0);
+ sema_init(&rdma->rq_sem, rdma->rq_depth);
return rdma;
}