Re: [PATCH] scsi/mvsas/mv_sas.c: Use dma_pool_zalloc

[John Garry]

On 18/10/2018 17:06, Sabyasachi Gupta wrote:
Replaced dma_pool_alloc + memset with dma_pool_zalloc
Signed-off-by: Sabyasachi Gupta <sabyasachi.li...@gmail.com>
---
 drivers/scsi/mvsas/mv_sas.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index cff43bd..d00d37d 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -790,12 +790,11 @@ static int mvs_task_prep(struct sas_task *task, struct 
mvs_info *mvi, int is_tmf
        slot->n_elem = n_elem;
        slot->slot_tag = tag;

-       slot->buf = dma_pool_alloc(mvi->dma_pool, GFP_ATOMIC, &slot->buf_dma);
+       slot->buf = dma_pool_zalloc(mvi->dma_pool, GFP_ATOMIC, &slot->buf_dma);
        if (!slot->buf) {
                rc = -ENOMEM;
                goto err_out_tag;
        }
-       memset(slot->buf, 0, MVS_SLOT_BUF_SZ);


How about also fixing these, below, up to use dma_zalloc_coherent() or 
even dmam_alloc_coherent() [as they're manually free'd at removal]:

static int mvs_alloc(struct mvs_info *mvi, struct Scsi_Host *shost)
{
    int i = 0, slot_nr;
    char pool_name[32];
...
    /*
     * alloc and init our DMA areas
     */
    mvi->tx = dma_alloc_coherent(mvi->dev,
                     sizeof(*mvi->tx) * MVS_CHIP_SLOT_SZ,
                     &mvi->tx_dma, GFP_KERNEL);
    if (!mvi->tx)
        goto err_out;
    memset(mvi->tx, 0, sizeof(*mvi->tx) * MVS_CHIP_SLOT_SZ);

...

Thanks,
John

        tei.task = task;
        tei.hdr = &mvi->slot[tag];