[PATCH net-next] net: chelsio: Use zeroing memory allocator instead of allocator/memset

[PATCH net-next] net: chelsio: Use zeroing memory allocator instead of allocator/memset

[YueHaibing]

Use dma_zalloc_coherent for allocating zeroed
memory and remove unnecessary memset function.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 drivers/net/ethernet/chelsio/cxgb3/sge.c   | 3 +--
 drivers/net/ethernet/chelsio/cxgb4/sge.c   | 3 +--
 drivers/net/ethernet/chelsio/cxgb4vf/sge.c | 7 +------
 3 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb3/sge.c b/drivers/net/ethernet/chelsio/cxgb3/sge.c
index e988caa..20b6e1b 100644
--- a/drivers/net/ethernet/chelsio/cxgb3/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/sge.c
@@ -620,7 +620,7 @@ static void *alloc_ring(struct pci_dev *pdev, size_t nelem, size_t elem_size,
 {
 	size_t len = nelem * elem_size;
 	void *s = NULL;
-	void *p = dma_alloc_coherent(&pdev->dev, len, phys, GFP_KERNEL);
+	void *p = dma_zalloc_coherent(&pdev->dev, len, phys, GFP_KERNEL);
 
 	if (!p)
 		return NULL;
@@ -633,7 +633,6 @@ static void *alloc_ring(struct pci_dev *pdev, size_t nelem, size_t elem_size,
 		}
 		*(void **)metadata = s;
 	}
-	memset(p, 0, len);
 	return p;
 }
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c
index 276f223..7a271fe 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c
@@ -694,7 +694,7 @@ static void *alloc_ring(struct device *dev, size_t nelem, size_t elem_size,
 {
 	size_t len = nelem * elem_size + stat_size;
 	void *s = NULL;
-	void *p = dma_alloc_coherent(dev, len, phys, GFP_KERNEL);
+	void *p = dma_zalloc_coherent(dev, len, phys, GFP_KERNEL);
 
 	if (!p)
 		return NULL;
@@ -708,7 +708,6 @@ static void *alloc_ring(struct device *dev, size_t nelem, size_t elem_size,
 	}
 	if (metadata)
 		*(void **)metadata = s;
-	memset(p, 0, len);
 	return p;
 }
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4vf/sge.c b/drivers/net/ethernet/chelsio/cxgb4vf/sge.c
index dfce5df..3007e1a 100644
--- a/drivers/net/ethernet/chelsio/cxgb4vf/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4vf/sge.c
@@ -756,7 +756,7 @@ static void *alloc_ring(struct device *dev, size_t nelem, size_t hwsize,
 	 * Allocate the hardware ring and PCI DMA bus address space for said.
 	 */
 	size_t hwlen = nelem * hwsize + stat_size;
-	void *hwring = dma_alloc_coherent(dev, hwlen, busaddrp, GFP_KERNEL);
+	void *hwring = dma_zalloc_coherent(dev, hwlen, busaddrp, GFP_KERNEL);
 
 	if (!hwring)
 		return NULL;
@@ -776,11 +776,6 @@ static void *alloc_ring(struct device *dev, size_t nelem, size_t hwsize,
 		*(void **)swringp = swring;
 	}
 
-	/*
-	 * Zero out the hardware ring and return its address as our function
-	 * value.
-	 */
-	memset(hwring, 0, hwlen);
 	return hwring;
 }
 
-- 
2.7.0

Re: [PATCH net-next] net: chelsio: Use zeroing memory allocator instead of allocator/memset

[David Miller]

From: YueHaibing <yuehaibing@huawei.com>
Date: Sun, 3 Jun 2018 10:40:15 +0800

> Use dma_zalloc_coherent for allocating zeroed
> memory and remove unnecessary memset function.
> 
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>

Applied.