linux-kernel - Re: [PATCH] usb : replace dma_pool_alloc and memset with dma_pool

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Date:	Wed, 28 Oct 2015 17:14:54 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Saurabh Sengar <saurabh.truth@...il.com>
CC:	<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb : replace dma_pool_alloc and memset with
 dma_pool_zalloc

On Wed, Oct 28, 2015 at 12:44:35PM +0530, Saurabh Sengar wrote:
> replace dma_pool_alloc and memset with a single call to dma_pool_zalloc
> 
> Signed-off-by: Saurabh Sengar <saurabh.truth@...il.com>
> ---
>  drivers/usb/chipidea/udc.c      | 3 +--
>  drivers/usb/gadget/udc/gr_udc.c | 3 +--
>  drivers/usb/host/uhci-q.c       | 3 +--
>  drivers/usb/host/whci/qset.c    | 3 +--
>  drivers/usb/host/xhci-mem.c     | 6 ++----
>  5 files changed, 6 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
> index 8223fe7..235b948f 100644
> --- a/drivers/usb/chipidea/udc.c
> +++ b/drivers/usb/chipidea/udc.c
> @@ -349,14 +349,13 @@ static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
>  	if (node == NULL)
>  		return -ENOMEM;
>  
> -	node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC,
> +	node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC,
>  				   &node->dma);
>  	if (node->ptr == NULL) {
>  		kfree(node);
>  		return -ENOMEM;
>  	}
>  
> -	memset(node->ptr, 0, sizeof(struct ci_hw_td));
>  	node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
>  	node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
>  	node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
> diff --git a/drivers/usb/gadget/udc/gr_udc.c b/drivers/usb/gadget/udc/gr_udc.c
> index b9429bc..39b7136 100644
> --- a/drivers/usb/gadget/udc/gr_udc.c
> +++ b/drivers/usb/gadget/udc/gr_udc.c
> @@ -253,13 +253,12 @@ static struct gr_dma_desc *gr_alloc_dma_desc(struct gr_ep *ep, gfp_t gfp_flags)
>  	dma_addr_t paddr;
>  	struct gr_dma_desc *dma_desc;
>  
> -	dma_desc = dma_pool_alloc(ep->dev->desc_pool, gfp_flags, &paddr);
> +	dma_desc = dma_pool_zalloc(ep->dev->desc_pool, gfp_flags, &paddr);
>  	if (!dma_desc) {
>  		dev_err(ep->dev->dev, "Could not allocate from DMA pool\n");
>  		return NULL;
>  	}
>  
> -	memset(dma_desc, 0, sizeof(*dma_desc));
>  	dma_desc->paddr = paddr;
>  
>  	return dma_desc;
> diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
> index da6f56d..c17ea15 100644
> --- a/drivers/usb/host/uhci-q.c
> +++ b/drivers/usb/host/uhci-q.c
> @@ -248,11 +248,10 @@ static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci,
>  	dma_addr_t dma_handle;
>  	struct uhci_qh *qh;
>  
> -	qh = dma_pool_alloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle);
> +	qh = dma_pool_zalloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle);
>  	if (!qh)
>  		return NULL;
>  
> -	memset(qh, 0, sizeof(*qh));
>  	qh->dma_handle = dma_handle;
>  
>  	qh->element = UHCI_PTR_TERM(uhci);
> diff --git a/drivers/usb/host/whci/qset.c b/drivers/usb/host/whci/qset.c
> index dc31c42..3297473 100644
> --- a/drivers/usb/host/whci/qset.c
> +++ b/drivers/usb/host/whci/qset.c
> @@ -30,10 +30,9 @@ struct whc_qset *qset_alloc(struct whc *whc, gfp_t mem_flags)
>  	struct whc_qset *qset;
>  	dma_addr_t dma;
>  
> -	qset = dma_pool_alloc(whc->qset_pool, mem_flags, &dma);
> +	qset = dma_pool_zalloc(whc->qset_pool, mem_flags, &dma);
>  	if (qset == NULL)
>  		return NULL;
> -	memset(qset, 0, sizeof(struct whc_qset));
>  
>  	qset->qset_dma = dma;
>  	qset->whc = whc;
> diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
> index 41f841f..060c20c 100644
> --- a/drivers/usb/host/xhci-mem.c
> +++ b/drivers/usb/host/xhci-mem.c
> @@ -47,13 +47,12 @@ static struct xhci_segment *xhci_segment_alloc(struct xhci_hcd *xhci,
>  	if (!seg)
>  		return NULL;
>  
> -	seg->trbs = dma_pool_alloc(xhci->segment_pool, flags, &dma);
> +	seg->trbs = dma_pool_zalloc(xhci->segment_pool, flags, &dma);
>  	if (!seg->trbs) {
>  		kfree(seg);
>  		return NULL;
>  	}
>  
> -	memset(seg->trbs, 0, TRB_SEGMENT_SIZE);
>  	/* If the cycle state is 0, set the cycle bit to 1 for all the TRBs */
>  	if (cycle_state == 0) {
>  		for (i = 0; i < TRBS_PER_SEGMENT; i++)
> @@ -517,12 +516,11 @@ static struct xhci_container_ctx *xhci_alloc_container_ctx(struct xhci_hcd *xhci
>  	if (type == XHCI_CTX_TYPE_INPUT)
>  		ctx->size += CTX_SIZE(xhci->hcc_params);
>  
> -	ctx->bytes = dma_pool_alloc(xhci->device_pool, flags, &ctx->dma);
> +	ctx->bytes = dma_pool_zalloc(xhci->device_pool, flags, &ctx->dma);
>  	if (!ctx->bytes) {
>  		kfree(ctx);
>  		return NULL;
>  	}
> -	memset(ctx->bytes, 0, ctx->size);
>  	return ctx;
>  }
>  
> -- 

For chipidea changes:
Acked-by: Peter Chen <peter.chen@...escale.com>

-- 

Best Regards,
Peter Chen
--
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