Re: [PATCH v2 07/12] IB/ocrdma: Adjust 21 checks for null pointers

From: Leon Romanovsky
Date: Sun Apr 23 2017 - 02:07:24 EST

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On Sat, Apr 22, 2017 at 04:47:19PM +0200, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> Date: Sat, 22 Apr 2017 14:20:37 +0200
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> The script âcheckpatch.plâ pointed information out like the following.
>
> Comparison to NULL could be written !â
>
> Thus fix affected source code places.
>
> Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> ---
>
> v2:
> Changes were rebased on source files from Linux next-20170421.
> These were recombined as requested by Doug Ledford.
>
> drivers/infiniband/hw/ocrdma/ocrdma_hw.c | 20 ++++++++++----------
> drivers/infiniband/hw/ocrdma/ocrdma_main.c | 2 +-
> drivers/infiniband/hw/ocrdma/ocrdma_verbs.c | 20 ++++++++++----------
> 3 files changed, 21 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
> index d5b988b011d1..8c7f0b108a7f 100644
> --- a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
> +++ b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
> @@ -665,7 +665,7 @@ static void ocrdma_process_qpcat_error(struct ocrdma_dev *dev,
> enum ib_qp_state new_ib_qps = IB_QPS_ERR;
> enum ib_qp_state old_ib_qps;
>
> - if (qp == NULL)
> + if (!qp)
> BUG();

There is a need to get rid of BUG() in driver code.

> ocrdma_qp_state_change(qp, new_ib_qps, &old_ib_qps);
> }
> @@ -693,7 +693,7 @@ static void ocrdma_dispatch_ibevent(struct ocrdma_dev *dev,
> if (cqe->qpvalid_qpid & OCRDMA_AE_MCQE_QPVALID) {
> if (qpid < dev->attr.max_qp)
> qp = dev->qp_tbl[qpid];
> - if (qp == NULL) {
> + if (!qp) {
> pr_err("ocrdma%d:Async event - qpid %u is not valid\n",
> dev->id, qpid);
> return;
> @@ -703,7 +703,7 @@ static void ocrdma_dispatch_ibevent(struct ocrdma_dev *dev,
> if (cqe->cqvalid_cqid & OCRDMA_AE_MCQE_CQVALID) {
> if (cqid < dev->attr.max_cq)
> cq = dev->cq_tbl[cqid];
> - if (cq == NULL) {
> + if (!cq) {
> pr_err("ocrdma%d:Async event - cqid %u is not valid\n",
> dev->id, cqid);
> return;
> @@ -882,7 +882,7 @@ static int ocrdma_mq_cq_handler(struct ocrdma_dev *dev, u16 cq_id)
>
> while (1) {
> cqe = ocrdma_get_mcqe(dev);
> - if (cqe == NULL)
> + if (!cqe)
> break;
> ocrdma_le32_to_cpu(cqe, sizeof(*cqe));
> cqe_popped += 1;
> @@ -948,7 +948,7 @@ static void ocrdma_qp_buddy_cq_handler(struct ocrdma_dev *dev,
> * false - Check for RQ CQ
> */
> bcq = _ocrdma_qp_buddy_cq_handler(dev, cq, true);
> - if (bcq == NULL)
> + if (!bcq)
> bcq = _ocrdma_qp_buddy_cq_handler(dev, cq, false);
> spin_unlock_irqrestore(&dev->flush_q_lock, flags);
>
> @@ -969,7 +969,7 @@ static void ocrdma_qp_cq_handler(struct ocrdma_dev *dev, u16 cq_idx)
> BUG();
>
> cq = dev->cq_tbl[cq_idx];
> - if (cq == NULL)
> + if (!cq)
> return;
>
> if (cq->ibcq.comp_handler) {
> @@ -1289,7 +1289,7 @@ int ocrdma_mbx_rdma_stats(struct ocrdma_dev *dev, bool reset)
> int status;
>
> old_stats = kmalloc(sizeof(*old_stats), GFP_KERNEL);
> - if (old_stats == NULL)
> + if (!old_stats)
> return -ENOMEM;
>
> memset(mqe, 0, sizeof(*mqe));
> @@ -1676,12 +1676,12 @@ static int ocrdma_mbx_create_ah_tbl(struct ocrdma_dev *dev)
> dev->av_tbl.pbl.va = dma_alloc_coherent(&pdev->dev, PAGE_SIZE,
> &dev->av_tbl.pbl.pa,
> GFP_KERNEL);
> - if (dev->av_tbl.pbl.va == NULL)
> + if (!dev->av_tbl.pbl.va)
> goto mem_err;
>
> dev->av_tbl.va = dma_alloc_coherent(&pdev->dev, dev->av_tbl.size,
> &pa, GFP_KERNEL);
> - if (dev->av_tbl.va == NULL)
> + if (!dev->av_tbl.va)
> goto mem_err_ah;
> dev->av_tbl.pa = pa;
> dev->av_tbl.num_ah = max_ah;
> @@ -1722,7 +1722,7 @@ static void ocrdma_mbx_delete_ah_tbl(struct ocrdma_dev *dev)
> struct ocrdma_delete_ah_tbl *cmd;
> struct pci_dev *pdev = dev->nic_info.pdev;
>
> - if (dev->av_tbl.va == NULL)
> + if (!dev->av_tbl.va)
> return;
>
> cmd = ocrdma_init_emb_mqe(OCRDMA_CMD_DELETE_AH_TBL, sizeof(*cmd));
> diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_main.c b/drivers/infiniband/hw/ocrdma/ocrdma_main.c
> index e2aa67d6cbb8..b82f6c6942e0 100644
> --- a/drivers/infiniband/hw/ocrdma/ocrdma_main.c
> +++ b/drivers/infiniband/hw/ocrdma/ocrdma_main.c
> @@ -238,7 +238,7 @@ static int ocrdma_alloc_resources(struct ocrdma_dev *dev)
>
> dev->stag_arr = kcalloc(OCRDMA_MAX_STAG, sizeof(*dev->stag_arr),
> GFP_KERNEL);
> - if (dev->stag_arr == NULL)
> + if (!dev->stag_arr)
> goto alloc_err;
>
> ocrdma_alloc_pd_pool(dev);
> diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
> index 5eaf946aeac6..c804889db7e1 100644
> --- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
> +++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
> @@ -267,7 +267,7 @@ static int ocrdma_add_mmap(struct ocrdma_ucontext *uctx, u64 phy_addr,
> struct ocrdma_mm *mm;
>
> mm = kzalloc(sizeof(*mm), GFP_KERNEL);
> - if (mm == NULL)
> + if (!mm)
> return -ENOMEM;
> mm->key.phy_addr = phy_addr;
> mm->key.len = len;
> @@ -1194,7 +1194,7 @@ static int ocrdma_add_qpn_map(struct ocrdma_dev *dev, struct ocrdma_qp *qp)
> {
> int status = -EINVAL;
>
> - if (qp->id < OCRDMA_MAX_QP && dev->qp_tbl[qp->id] == NULL) {
> + if (qp->id < OCRDMA_MAX_QP && !dev->qp_tbl[qp->id]) {
> dev->qp_tbl[qp->id] = qp;
> status = 0;
> }
> @@ -1362,11 +1362,11 @@ static int ocrdma_alloc_wr_id_tbl(struct ocrdma_qp *qp)
> {
> qp->wqe_wr_id_tbl = kcalloc(qp->sq.max_cnt, sizeof(*qp->wqe_wr_id_tbl),
> GFP_KERNEL);
> - if (qp->wqe_wr_id_tbl == NULL)
> + if (!qp->wqe_wr_id_tbl)
> return -ENOMEM;
> qp->rqe_wr_id_tbl = kcalloc(qp->rq.max_cnt, sizeof(*qp->rqe_wr_id_tbl),
> GFP_KERNEL);
> - if (qp->rqe_wr_id_tbl == NULL)
> + if (!qp->rqe_wr_id_tbl)
> return -ENOMEM;

Memory leak here, need to free qp->wqe_wr_id_tb here.

>
> return 0;
> @@ -1426,7 +1426,7 @@ struct ib_qp *ocrdma_create_qp(struct ib_pd *ibpd,
> goto gen_err;
> }
> ocrdma_set_qp_init_params(qp, pd, attrs);
> - if (udata == NULL)
> + if (!udata)
> qp->cap_flags |= (OCRDMA_QP_MW_BIND | OCRDMA_QP_LKEY0 |
> OCRDMA_QP_FAST_REG);
>
> @@ -1438,7 +1438,7 @@ struct ib_qp *ocrdma_create_qp(struct ib_pd *ibpd,
> goto mbx_err;
>
> /* user space QP's wr_id table are managed in library */
> - if (udata == NULL) {
> + if (!udata) {
> status = ocrdma_alloc_wr_id_tbl(qp);
> if (status)
> goto map_err;
> @@ -1899,11 +1899,11 @@ struct ib_srq *ocrdma_create_srq(struct ib_pd *ibpd,
> if (status)
> goto err;
>
> - if (udata == NULL) {
> + if (!udata) {
> srq->rqe_wr_id_tbl = kcalloc(srq->rq.max_cnt,
> sizeof(*srq->rqe_wr_id_tbl),
> GFP_KERNEL);
> - if (srq->rqe_wr_id_tbl == NULL)
> + if (!srq->rqe_wr_id_tbl)
> goto arm_err;
>
> srq->bit_fields_len = (srq->rq.max_cnt / 32) +
> @@ -1911,7 +1911,7 @@ struct ib_srq *ocrdma_create_srq(struct ib_pd *ibpd,
> srq->idx_bit_fields = kmalloc_array(srq->bit_fields_len,
> sizeof(*srq->idx_bit_fields),
> GFP_KERNEL);
> - if (srq->idx_bit_fields == NULL)
> + if (!srq->idx_bit_fields)
> goto arm_err;
> memset(srq->idx_bit_fields, 0xff,
> srq->bit_fields_len * sizeof(*srq->idx_bit_fields));
> @@ -2885,7 +2885,7 @@ static int ocrdma_poll_hwcq(struct ocrdma_cq *cq, int num_entries,
> if (qpn == 0)
> goto skip_cqe;
> qp = dev->qp_tbl[qpn];
> - BUG_ON(qp == NULL);
> + BUG_ON(!qp);

Again, bug in driver can crash whole system. There is a need to get rid
of it.

>
> expand = is_cqe_for_sq(cqe)
> ? ocrdma_poll_scqe(qp, cqe, ibwc, &polled, &stop)
> --
> 2.12.2
>

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Next message: Pan Bian: "[PATCH 1/1] lwtunnel: check return value of nla_nest_start"
Previous message: David E. Box: "[PATCH] x86/intel_idle: add GLK support"
In reply to: SF Markus Elfring: "[PATCH v2 07/12] IB/ocrdma: Adjust 21 checks for null pointers"
Next in thread: SF Markus Elfring: "[PATCH v2 08/12] IB/ocrdma: Delete an error message for a failed memory allocation in ocrdma_add()"
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