RDMA/nes: Avoid memory allocation during CQ destroy

The memory allocation call can fail and cause to early return
from nes_desotroy_cq() function. This situation will cause to
memory leak of struct nes_cq. Rewrite function to avoid memory
allocation.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/nes/nes_verbs.c b/drivers/infiniband/hw/nes/nes_verbs.c
index db044b2eaeadbfc0bb5624f7febfcc1e85d6079a..7677f1f734bb630f7ce899f33a1414018b32dfa9 100644 (file)
--- a/drivers/infiniband/hw/nes/nes_verbs.c
+++ b/drivers/infiniband/hw/nes/nes_verbs.c
@@ -1641,7 +1641,7 @@ static int nes_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
        struct nes_vnic *nesvnic;
        struct nes_adapter *nesadapter;
        struct nes_hw_cqp_wqe *cqp_wqe;
-       struct nes_cqp_request *cqp_request;
+       struct nes_cqp_request cqp_request = {};
        unsigned long flags;
        u32 opcode = 0;
        int ret;
@@ -1654,13 +1654,10 @@ static int nes_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
        nes_debug(NES_DBG_CQ, "Destroy CQ%u\n", nescq->hw_cq.cq_number);
 
        /* Send DestroyCQ request to CQP */
-       cqp_request = nes_get_cqp_request(nesdev);
-       if (cqp_request == NULL) {
-               nes_debug(NES_DBG_CQ, "Failed to get a cqp_request.\n");
-               return -ENOMEM;
-       }
-       cqp_request->waiting = 1;
-       cqp_wqe = &cqp_request->cqp_wqe;
+       INIT_LIST_HEAD(&cqp_request.list);
+       init_waitqueue_head(&cqp_request.waitq);
+       cqp_request.waiting = 1;
+       cqp_wqe = &cqp_request.cqp_wqe;
        opcode = NES_CQP_DESTROY_CQ | (nescq->hw_cq.cq_size << 16);
        spin_lock_irqsave(&nesadapter->pbl_lock, flags);
        if (nescq->virtual_cq == 1) {
@@ -1687,30 +1684,28 @@ static int nes_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
        if (!nescq->mcrqf)
                nes_free_resource(nesadapter, nesadapter->allocated_cqs, nescq->hw_cq.cq_number);
 
-       atomic_set(&cqp_request->refcount, 2);
-       nes_post_cqp_request(nesdev, cqp_request);
+       nes_post_cqp_request(nesdev, &cqp_request);
 
        /* Wait for CQP */
        nes_debug(NES_DBG_CQ, "Waiting for destroy iWARP CQ%u to complete.\n",
                        nescq->hw_cq.cq_number);
-       ret = wait_event_timeout(cqp_request->waitq, (0 != cqp_request->request_done),
-                       NES_EVENT_TIMEOUT);
+       ret = wait_event_timeout(cqp_request.waitq, cqp_request.request_done,
+                                NES_EVENT_TIMEOUT);
        nes_debug(NES_DBG_CQ, "Destroy iWARP CQ%u completed, wait_event_timeout ret = %u,"
                        " CQP Major:Minor codes = 0x%04X:0x%04X.\n",
-                       nescq->hw_cq.cq_number, ret, cqp_request->major_code,
-                       cqp_request->minor_code);
+                       nescq->hw_cq.cq_number, ret, cqp_request.major_code,
+                       cqp_request.minor_code);
        if (!ret) {
                nes_debug(NES_DBG_CQ, "iWARP CQ%u destroy timeout expired\n",
                                        nescq->hw_cq.cq_number);
                ret = -ETIME;
-       } else if (cqp_request->major_code) {
+       } else if (cqp_request.major_code) {
                nes_debug(NES_DBG_CQ, "iWARP CQ%u destroy failed\n",
                                        nescq->hw_cq.cq_number);
                ret = -EIO;
        } else {
                ret = 0;
        }
-       nes_put_cqp_request(nesdev, cqp_request);
 
        if (nescq->cq_mem_size)
                pci_free_consistent(nesdev->pcidev, nescq->cq_mem_size,
@@ -1899,7 +1894,6 @@ static int nes_reg_mr(struct nes_device *nesdev, struct nes_pd *nespd,
        }
        barrier();
 
-       atomic_set(&cqp_request->refcount, 2);
        nes_post_cqp_request(nesdev, cqp_request);
 
        /* Wait for CQP */