net: chelsio: Use zeroing memory allocator instead of allocator/memset

Use dma_zalloc_coherent for allocating zeroed
memory and remove unnecessary memset function.
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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;
 }
 

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;
 }
 

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;
 }