netdev - Re: [PATCH net-next] qlcnic: Convert vmalloc/memset to kcalloc

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Date:	Fri, 10 Jan 2014 16:58:45 +0000
From:	Jitendra Kalsaria <jitendra.kalsaria@...gic.com>
To:	Joe Perches <joe@...ches.com>
CC:	Dept-Eng Linux Driver <Linux-Driver@...gic.com>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] qlcnic: Convert vmalloc/memset to kcalloc



On 1/8/14 10:42 PM, "Joe Perches" <joe@...ches.com> wrote:

>vmalloc is a limited resource.  Don't use it unnecessarily.
>
>It seems this allocation should work with kcalloc.
>
>Remove unnecessary memset(,0,) of buf as it's completely
>overwritten as the previously only unset field in
>struct qlcnic_pci_func_cfg is now set to 0.
>
>Use kfree instead of vfree.
>Use ETH_ALEN instead of 6.
>
>Signed-off-by: Joe Perches <joe@...ches.com>
>---
> drivers/net/ethernet/qlogic/qlcnic/qlcnic.h       |  2 +-
> drivers/net/ethernet/qlogic/qlcnic/qlcnic_sysfs.c | 16 ++++++----------
> 2 files changed, 7 insertions(+), 11 deletions(-)

Acked-by: Jitendra Kalsaria <jitendra.kalsaria@...gic.com>

>
>diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
>b/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
>index 35d4876..8d7aa4c 100644
>--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
>+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
>@@ -1267,7 +1267,7 @@ struct qlcnic_pci_func_cfg {
> 	u16	port_num;
> 	u8	pci_func;
> 	u8	func_state;
>-	u8	def_mac_addr[6];
>+	u8	def_mac_addr[ETH_ALEN];
> };
> 
> struct qlcnic_npar_func_cfg {
>diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sysfs.c
>b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sysfs.c
>index b529667..c9b704d 100644
>--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sysfs.c
>+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sysfs.c
>@@ -6,7 +6,6 @@
>  */
> 
> #include <linux/slab.h>
>-#include <linux/vmalloc.h>
> #include <linux/interrupt.h>
> 
> #include "qlcnic.h"
>@@ -927,38 +926,35 @@ static ssize_t qlcnic_sysfs_read_pci_config(struct
>file *file,
> 	u32 pci_func_count = qlcnic_get_pci_func_count(adapter);
> 	struct qlcnic_pci_func_cfg *pci_cfg;
> 	struct qlcnic_pci_info *pci_info;
>-	size_t pci_info_sz, pci_cfg_sz;
>+	size_t pci_cfg_sz;
> 	int i, ret;
> 
> 	pci_cfg_sz = pci_func_count * sizeof(*pci_cfg);
> 	if (size != pci_cfg_sz)
> 		return QL_STATUS_INVALID_PARAM;
> 
>-	pci_info_sz = pci_func_count * sizeof(*pci_info);
>-	pci_info = vmalloc(pci_info_sz);
>+	pci_info = kcalloc(pci_func_count, sizeof(*pci_info), GFP_KERNEL);
> 	if (!pci_info)
> 		return -ENOMEM;
> 
>-	memset(pci_info, 0, pci_info_sz);
>-	memset(buf, 0, pci_cfg_sz);
>-	pci_cfg = (struct qlcnic_pci_func_cfg *)buf;
>-
> 	ret = qlcnic_get_pci_info(adapter, pci_info);
> 	if (ret) {
>-		vfree(pci_info);
>+		kfree(pci_info);
> 		return ret;
> 	}
> 
>+	pci_cfg = (struct qlcnic_pci_func_cfg *)buf;
> 	for (i = 0; i < pci_func_count; i++) {
> 		pci_cfg[i].pci_func = pci_info[i].id;
> 		pci_cfg[i].func_type = pci_info[i].type;
>+		pci_cfg[i].func_state = 0;
> 		pci_cfg[i].port_num = pci_info[i].default_port;
> 		pci_cfg[i].min_bw = pci_info[i].tx_min_bw;
> 		pci_cfg[i].max_bw = pci_info[i].tx_max_bw;
> 		memcpy(&pci_cfg[i].def_mac_addr, &pci_info[i].mac, ETH_ALEN);
> 	}
> 
>-	vfree(pci_info);
>+	kfree(pci_info);
> 	return size;
> }

Thanks,
Jiten

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