net/wireless: Use kmemdup rather than duplicating its implementation

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.
Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath6kl/wmi.c

@@ -3650,7 +3650,7 @@ static int ath6kl_wmi_send_action_cmd(struct wmi *wmi, u8 if_idx, u32 id,
 	if (wait)
 		return -EINVAL; /* Offload for wait not supported */
 
-	buf = kmalloc(data_len, GFP_KERNEL);
+	buf = kmemdup(data, data_len, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;
 
@@ -3661,7 +3661,6 @@ static int ath6kl_wmi_send_action_cmd(struct wmi *wmi, u8 if_idx, u32 id,
 	}
 
 	kfree(wmi->last_mgmt_tx_frame);
-	memcpy(buf, data, data_len);
 	wmi->last_mgmt_tx_frame = buf;
 	wmi->last_mgmt_tx_frame_len = data_len;
 
@@ -3689,7 +3688,7 @@ static int __ath6kl_wmi_send_mgmt_cmd(struct wmi *wmi, u8 if_idx, u32 id,
 	if (wait)
 		return -EINVAL; /* Offload for wait not supported */
 
-	buf = kmalloc(data_len, GFP_KERNEL);
+	buf = kmemdup(data, data_len, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;
 
@@ -3700,7 +3699,6 @@ static int __ath6kl_wmi_send_mgmt_cmd(struct wmi *wmi, u8 if_idx, u32 id,
 	}
 
 	kfree(wmi->last_mgmt_tx_frame);
-	memcpy(buf, data, data_len);
 	wmi->last_mgmt_tx_frame = buf;
 	wmi->last_mgmt_tx_frame_len = data_len;
 

drivers/net/wireless/st/cw1200/queue.c

@@ -79,10 +79,9 @@ static void cw1200_queue_register_post_gc(struct list_head *gc_list,
 					  struct cw1200_queue_item *item)
 {
 	struct cw1200_queue_item *gc_item;
-	gc_item = kmalloc(sizeof(struct cw1200_queue_item),
+	gc_item = kmemdup(item, sizeof(struct cw1200_queue_item),
 			GFP_ATOMIC);
 	BUG_ON(!gc_item);
-	memcpy(gc_item, item, sizeof(struct cw1200_queue_item));
 	list_add_tail(&gc_item->head, gc_list);
 }
 

drivers/net/wireless/ti/wlcore/main.c

@@ -1434,7 +1434,7 @@ int wl1271_rx_filter_alloc_field(struct wl12xx_rx_filter *filter,
 
 	field = &filter->fields[filter->num_fields];
 
-	field->pattern = kzalloc(len, GFP_KERNEL);
+	field->pattern = kmemdup(pattern, len, GFP_KERNEL);
 	if (!field->pattern) {
 		wl1271_warning("Failed to allocate RX filter pattern");
 		return -ENOMEM;
@@ -1445,7 +1445,6 @@ int wl1271_rx_filter_alloc_field(struct wl12xx_rx_filter *filter,
 	field->offset = cpu_to_le16(offset);
 	field->flags = flags;
 	field->len = len;
-	memcpy(field->pattern, pattern, len);
 
 	return 0;
 }