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SubjectRe: [PATCH 7/9] scsi: bnx2fc: Use zeroing allocator rather than allocator/memset

On Sat, 30 Dec 2017, 10:28am, Himanshu Jha wrote:

> Use dma_zalloc_coherent instead of dma_alloc_coherent followed by
> memset 0.
>
> Generated-by: scripts/coccinelle/api/alloc/kzalloc-simple.cocci
>
> Suggested-by: Luis R. Rodriguez <mcgrof@kernel.org>
> Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
> ---
> drivers/scsi/bnx2fc/bnx2fc_hwi.c | 60 +++++++++++++++++-----------------------
> drivers/scsi/bnx2fc/bnx2fc_tgt.c | 51 +++++++++++++++-------------------
> 2 files changed, 47 insertions(+), 64 deletions(-)
>
> diff --git a/drivers/scsi/bnx2fc/bnx2fc_hwi.c b/drivers/scsi/bnx2fc/bnx2fc_hwi.c
> index 26de61d..e8ae4d6 100644
> --- a/drivers/scsi/bnx2fc/bnx2fc_hwi.c
> +++ b/drivers/scsi/bnx2fc/bnx2fc_hwi.c
> @@ -1857,16 +1857,15 @@ int bnx2fc_setup_task_ctx(struct bnx2fc_hba *hba)
> * entries. Hence the limit with one page is 8192 task context
> * entries.
> */
> - hba->task_ctx_bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
> - PAGE_SIZE,
> - &hba->task_ctx_bd_dma,
> - GFP_KERNEL);
> + hba->task_ctx_bd_tbl = dma_zalloc_coherent(&hba->pcidev->dev,
> + PAGE_SIZE,
> + &hba->task_ctx_bd_dma,
> + GFP_KERNEL);
> if (!hba->task_ctx_bd_tbl) {
> printk(KERN_ERR PFX "unable to allocate task context BDT\n");
> rc = -1;
> goto out;
> }
> - memset(hba->task_ctx_bd_tbl, 0, PAGE_SIZE);
>
> /*
> * Allocate task_ctx which is an array of pointers pointing to
> @@ -1895,16 +1894,15 @@ int bnx2fc_setup_task_ctx(struct bnx2fc_hba *hba)
> task_ctx_bdt = (struct regpair *)hba->task_ctx_bd_tbl;
> for (i = 0; i < task_ctx_arr_sz; i++) {
>
> - hba->task_ctx[i] = dma_alloc_coherent(&hba->pcidev->dev,
> - PAGE_SIZE,
> - &hba->task_ctx_dma[i],
> - GFP_KERNEL);
> + hba->task_ctx[i] = dma_zalloc_coherent(&hba->pcidev->dev,
> + PAGE_SIZE,
> + &hba->task_ctx_dma[i],
> + GFP_KERNEL);
> if (!hba->task_ctx[i]) {
> printk(KERN_ERR PFX "unable to alloc task context\n");
> rc = -1;
> goto out3;
> }
> - memset(hba->task_ctx[i], 0, PAGE_SIZE);
> addr = (u64)hba->task_ctx_dma[i];
> task_ctx_bdt->hi = cpu_to_le32((u64)addr >> 32);
> task_ctx_bdt->lo = cpu_to_le32((u32)addr);
> @@ -2033,28 +2031,23 @@ static int bnx2fc_allocate_hash_table(struct bnx2fc_hba *hba)
> }
>
> for (i = 0; i < segment_count; ++i) {
> - hba->hash_tbl_segments[i] =
> - dma_alloc_coherent(&hba->pcidev->dev,
> - BNX2FC_HASH_TBL_CHUNK_SIZE,
> - &dma_segment_array[i],
> - GFP_KERNEL);
> + hba->hash_tbl_segments[i] =
> + dma_zalloc_coherent(&hba->pcidev->dev,
> + BNX2FC_HASH_TBL_CHUNK_SIZE,
> + &dma_segment_array[i],
> + GFP_KERNEL);
> if (!hba->hash_tbl_segments[i]) {
> printk(KERN_ERR PFX "hash segment alloc failed\n");
> goto cleanup_dma;
> }
> - memset(hba->hash_tbl_segments[i], 0,
> - BNX2FC_HASH_TBL_CHUNK_SIZE);
> }
>
> - hba->hash_tbl_pbl = dma_alloc_coherent(&hba->pcidev->dev,
> - PAGE_SIZE,
> - &hba->hash_tbl_pbl_dma,
> - GFP_KERNEL);
> + hba->hash_tbl_pbl = dma_zalloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
> + &hba->hash_tbl_pbl_dma,
> + GFP_KERNEL);
> if (!hba->hash_tbl_pbl) {
> printk(KERN_ERR PFX "hash table pbl alloc failed\n");
> goto cleanup_dma;
> }
> - memset(hba->hash_tbl_pbl, 0, PAGE_SIZE);
>
> pbl = hba->hash_tbl_pbl;
> for (i = 0; i < segment_count; ++i) {
> @@ -2111,27 +2104,26 @@ int bnx2fc_setup_fw_resc(struct bnx2fc_hba *hba)
> return -ENOMEM;
>
> mem_size = BNX2FC_NUM_MAX_SESS * sizeof(struct regpair);
> - hba->t2_hash_tbl_ptr = dma_alloc_coherent(&hba->pcidev->dev, mem_size,
> - &hba->t2_hash_tbl_ptr_dma,
> - GFP_KERNEL);
> + hba->t2_hash_tbl_ptr = dma_zalloc_coherent(&hba->pcidev->dev,
> + mem_size,
> + &hba->t2_hash_tbl_ptr_dma,
> + GFP_KERNEL);
> if (!hba->t2_hash_tbl_ptr) {
> printk(KERN_ERR PFX "unable to allocate t2 hash table ptr\n");
> bnx2fc_free_fw_resc(hba);
> return -ENOMEM;
> }
> - memset(hba->t2_hash_tbl_ptr, 0x00, mem_size);
>
> mem_size = BNX2FC_NUM_MAX_SESS *
> sizeof(struct fcoe_t2_hash_table_entry);
> - hba->t2_hash_tbl = dma_alloc_coherent(&hba->pcidev->dev, mem_size,
> - &hba->t2_hash_tbl_dma,
> - GFP_KERNEL);
> + hba->t2_hash_tbl = dma_zalloc_coherent(&hba->pcidev->dev, mem_size,
> + &hba->t2_hash_tbl_dma,
> + GFP_KERNEL);
> if (!hba->t2_hash_tbl) {
> printk(KERN_ERR PFX "unable to allocate t2 hash table\n");
> bnx2fc_free_fw_resc(hba);
> return -ENOMEM;
> }
> - memset(hba->t2_hash_tbl, 0x00, mem_size);
> for (i = 0; i < BNX2FC_NUM_MAX_SESS; i++) {
> addr = (unsigned long) hba->t2_hash_tbl_dma +
> ((i+1) * sizeof(struct fcoe_t2_hash_table_entry));
> @@ -2148,16 +2140,14 @@ int bnx2fc_setup_fw_resc(struct bnx2fc_hba *hba)
> return -ENOMEM;
> }
>
> - hba->stats_buffer = dma_alloc_coherent(&hba->pcidev->dev,
> - PAGE_SIZE,
> - &hba->stats_buf_dma,
> - GFP_KERNEL);
> + hba->stats_buffer = dma_zalloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
> + &hba->stats_buf_dma,
> + GFP_KERNEL);
> if (!hba->stats_buffer) {
> printk(KERN_ERR PFX "unable to alloc Stats Buffer\n");
> bnx2fc_free_fw_resc(hba);
> return -ENOMEM;
> }
> - memset(hba->stats_buffer, 0x00, PAGE_SIZE);
>
> return 0;
> }
> diff --git a/drivers/scsi/bnx2fc/bnx2fc_tgt.c b/drivers/scsi/bnx2fc/bnx2fc_tgt.c
> index a8ae1a0..e3d1c7c 100644
> --- a/drivers/scsi/bnx2fc/bnx2fc_tgt.c
> +++ b/drivers/scsi/bnx2fc/bnx2fc_tgt.c
> @@ -672,56 +672,52 @@ static int bnx2fc_alloc_session_resc(struct bnx2fc_hba *hba,
> tgt->sq_mem_size = (tgt->sq_mem_size + (CNIC_PAGE_SIZE - 1)) &
> CNIC_PAGE_MASK;
>
> - tgt->sq = dma_alloc_coherent(&hba->pcidev->dev, tgt->sq_mem_size,
> - &tgt->sq_dma, GFP_KERNEL);
> + tgt->sq = dma_zalloc_coherent(&hba->pcidev->dev, tgt->sq_mem_size,
> + &tgt->sq_dma, GFP_KERNEL);
> if (!tgt->sq) {
> printk(KERN_ERR PFX "unable to allocate SQ memory %d\n",
> tgt->sq_mem_size);
> goto mem_alloc_failure;
> }
> - memset(tgt->sq, 0, tgt->sq_mem_size);
>
> /* Allocate and map CQ */
> tgt->cq_mem_size = tgt->max_cqes * BNX2FC_CQ_WQE_SIZE;
> tgt->cq_mem_size = (tgt->cq_mem_size + (CNIC_PAGE_SIZE - 1)) &
> CNIC_PAGE_MASK;
>
> - tgt->cq = dma_alloc_coherent(&hba->pcidev->dev, tgt->cq_mem_size,
> - &tgt->cq_dma, GFP_KERNEL);
> + tgt->cq = dma_zalloc_coherent(&hba->pcidev->dev, tgt->cq_mem_size,
> + &tgt->cq_dma, GFP_KERNEL);
> if (!tgt->cq) {
> printk(KERN_ERR PFX "unable to allocate CQ memory %d\n",
> tgt->cq_mem_size);
> goto mem_alloc_failure;
> }
> - memset(tgt->cq, 0, tgt->cq_mem_size);
>
> /* Allocate and map RQ and RQ PBL */
> tgt->rq_mem_size = tgt->max_rqes * BNX2FC_RQ_WQE_SIZE;
> tgt->rq_mem_size = (tgt->rq_mem_size + (CNIC_PAGE_SIZE - 1)) &
> CNIC_PAGE_MASK;
>
> - tgt->rq = dma_alloc_coherent(&hba->pcidev->dev, tgt->rq_mem_size,
> - &tgt->rq_dma, GFP_KERNEL);
> + tgt->rq = dma_zalloc_coherent(&hba->pcidev->dev, tgt->rq_mem_size,
> + &tgt->rq_dma, GFP_KERNEL);
> if (!tgt->rq) {
> printk(KERN_ERR PFX "unable to allocate RQ memory %d\n",
> tgt->rq_mem_size);
> goto mem_alloc_failure;
> }
> - memset(tgt->rq, 0, tgt->rq_mem_size);
>
> tgt->rq_pbl_size = (tgt->rq_mem_size / CNIC_PAGE_SIZE) * sizeof(void *);
> tgt->rq_pbl_size = (tgt->rq_pbl_size + (CNIC_PAGE_SIZE - 1)) &
> CNIC_PAGE_MASK;
>
> - tgt->rq_pbl = dma_alloc_coherent(&hba->pcidev->dev, tgt->rq_pbl_size,
> - &tgt->rq_pbl_dma, GFP_KERNEL);
> + tgt->rq_pbl = dma_zalloc_coherent(&hba->pcidev->dev, tgt->rq_pbl_size,
> + &tgt->rq_pbl_dma, GFP_KERNEL);
> if (!tgt->rq_pbl) {
> printk(KERN_ERR PFX "unable to allocate RQ PBL %d\n",
> tgt->rq_pbl_size);
> goto mem_alloc_failure;
> }
>
> - memset(tgt->rq_pbl, 0, tgt->rq_pbl_size);
> num_pages = tgt->rq_mem_size / CNIC_PAGE_SIZE;
> page = tgt->rq_dma;
> pbl = (u32 *)tgt->rq_pbl;
> @@ -739,44 +735,43 @@ static int bnx2fc_alloc_session_resc(struct bnx2fc_hba *hba,
> tgt->xferq_mem_size = (tgt->xferq_mem_size + (CNIC_PAGE_SIZE - 1)) &
> CNIC_PAGE_MASK;
>
> - tgt->xferq = dma_alloc_coherent(&hba->pcidev->dev, tgt->xferq_mem_size,
> - &tgt->xferq_dma, GFP_KERNEL);
> + tgt->xferq = dma_zalloc_coherent(&hba->pcidev->dev,
> + tgt->xferq_mem_size, &tgt->xferq_dma,
> + GFP_KERNEL);
> if (!tgt->xferq) {
> printk(KERN_ERR PFX "unable to allocate XFERQ %d\n",
> tgt->xferq_mem_size);
> goto mem_alloc_failure;
> }
> - memset(tgt->xferq, 0, tgt->xferq_mem_size);
>
> /* Allocate and map CONFQ & CONFQ PBL */
> tgt->confq_mem_size = tgt->max_sqes * BNX2FC_CONFQ_WQE_SIZE;
> tgt->confq_mem_size = (tgt->confq_mem_size + (CNIC_PAGE_SIZE - 1)) &
> CNIC_PAGE_MASK;
>
> - tgt->confq = dma_alloc_coherent(&hba->pcidev->dev, tgt->confq_mem_size,
> - &tgt->confq_dma, GFP_KERNEL);
> + tgt->confq = dma_zalloc_coherent(&hba->pcidev->dev,
> + tgt->confq_mem_size, &tgt->confq_dma,
> + GFP_KERNEL);
> if (!tgt->confq) {
> printk(KERN_ERR PFX "unable to allocate CONFQ %d\n",
> tgt->confq_mem_size);
> goto mem_alloc_failure;
> }
> - memset(tgt->confq, 0, tgt->confq_mem_size);
>
> tgt->confq_pbl_size =
> (tgt->confq_mem_size / CNIC_PAGE_SIZE) * sizeof(void *);
> tgt->confq_pbl_size =
> (tgt->confq_pbl_size + (CNIC_PAGE_SIZE - 1)) & CNIC_PAGE_MASK;
>
> - tgt->confq_pbl = dma_alloc_coherent(&hba->pcidev->dev,
> - tgt->confq_pbl_size,
> - &tgt->confq_pbl_dma, GFP_KERNEL);
> + tgt->confq_pbl = dma_zalloc_coherent(&hba->pcidev->dev,
> + tgt->confq_pbl_size,
> + &tgt->confq_pbl_dma, GFP_KERNEL);
> if (!tgt->confq_pbl) {
> printk(KERN_ERR PFX "unable to allocate CONFQ PBL %d\n",
> tgt->confq_pbl_size);
> goto mem_alloc_failure;
> }
>
> - memset(tgt->confq_pbl, 0, tgt->confq_pbl_size);
> num_pages = tgt->confq_mem_size / CNIC_PAGE_SIZE;
> page = tgt->confq_dma;
> pbl = (u32 *)tgt->confq_pbl;
> @@ -792,15 +787,14 @@ static int bnx2fc_alloc_session_resc(struct bnx2fc_hba *hba,
> /* Allocate and map ConnDB */
> tgt->conn_db_mem_size = sizeof(struct fcoe_conn_db);
>
> - tgt->conn_db = dma_alloc_coherent(&hba->pcidev->dev,
> - tgt->conn_db_mem_size,
> - &tgt->conn_db_dma, GFP_KERNEL);
> + tgt->conn_db = dma_zalloc_coherent(&hba->pcidev->dev,
> + tgt->conn_db_mem_size,
> + &tgt->conn_db_dma, GFP_KERNEL);
> if (!tgt->conn_db) {
> printk(KERN_ERR PFX "unable to allocate conn_db %d\n",
> tgt->conn_db_mem_size);
> goto mem_alloc_failure;
> }
> - memset(tgt->conn_db, 0, tgt->conn_db_mem_size);
>
>
> /* Allocate and map LCQ */
> @@ -808,15 +802,14 @@ static int bnx2fc_alloc_session_resc(struct bnx2fc_hba *hba,
> tgt->lcq_mem_size = (tgt->lcq_mem_size + (CNIC_PAGE_SIZE - 1)) &
> CNIC_PAGE_MASK;
>
> - tgt->lcq = dma_alloc_coherent(&hba->pcidev->dev, tgt->lcq_mem_size,
> - &tgt->lcq_dma, GFP_KERNEL);
> + tgt->lcq = dma_zalloc_coherent(&hba->pcidev->dev, tgt->lcq_mem_size,
> + &tgt->lcq_dma, GFP_KERNEL);
>
> if (!tgt->lcq) {
> printk(KERN_ERR PFX "unable to allocate lcq %d\n",
> tgt->lcq_mem_size);
> goto mem_alloc_failure;
> }
> - memset(tgt->lcq, 0, tgt->lcq_mem_size);
>
> tgt->conn_db->rq_prod = 0x8000;
>
>

Conversion looks sane.

Acked-by: Chad Dupuis <chad.dupuis@cavium.com>

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