[PATCH net-next v2 3/5] r8152: use alloc_pages for rx buffer

[Hayes Wang]

Replace kmalloc_node() with alloc_pages() for rx buffer.

Signed-off-by: Hayes Wang <hayesw...@realtek.com>
---
 drivers/net/usb/r8152.c | 31 +++++++++++--------------------
 1 file changed, 11 insertions(+), 20 deletions(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index d063c9b358e5..f41cb728e999 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -698,8 +698,8 @@ struct rx_agg {
        struct list_head list, info_list;
        struct urb *urb;
        struct r8152 *context;
+       struct page *page;
        void *buffer;
-       void *head;
 };
 
 struct tx_agg {
@@ -1476,7 +1476,7 @@ static void free_rx_agg(struct r8152 *tp, struct rx_agg 
*agg)
        list_del(&agg->info_list);
 
        usb_free_urb(agg->urb);
-       kfree(agg->buffer);
+       __free_pages(agg->page, get_order(tp->rx_buf_sz));
        kfree(agg);
 
        atomic_dec(&tp->rx_count);
@@ -1486,28 +1486,19 @@ static struct rx_agg *alloc_rx_agg(struct r8152 *tp, 
gfp_t mflags)
 {
        struct net_device *netdev = tp->netdev;
        int node = netdev->dev.parent ? dev_to_node(netdev->dev.parent) : -1;
+       unsigned int order = get_order(tp->rx_buf_sz);
        struct rx_agg *rx_agg;
        unsigned long flags;
-       u8 *buf;
 
        rx_agg = kmalloc_node(sizeof(*rx_agg), mflags, node);
        if (!rx_agg)
                return NULL;
 
-       buf = kmalloc_node(tp->rx_buf_sz, mflags, node);
-       if (!buf)
+       rx_agg->page = alloc_pages(mflags, order);
+       if (!rx_agg->page)
                goto free_rx;
 
-       if (buf != rx_agg_align(buf)) {
-               kfree(buf);
-               buf = kmalloc_node(tp->rx_buf_sz + RX_ALIGN, mflags,
-                                  node);
-               if (!buf)
-                       goto free_rx;
-       }
-
-       rx_agg->buffer = buf;
-       rx_agg->head = rx_agg_align(buf);
+       rx_agg->buffer = page_address(rx_agg->page);
 
        rx_agg->urb = usb_alloc_urb(0, mflags);
        if (!rx_agg->urb)
@@ -1526,7 +1517,7 @@ static struct rx_agg *alloc_rx_agg(struct r8152 *tp, 
gfp_t mflags)
        return rx_agg;
 
 free_buf:
-       kfree(rx_agg->buffer);
+       __free_pages(rx_agg->page, order);
 free_rx:
        kfree(rx_agg);
        return NULL;
@@ -2003,8 +1994,8 @@ static int rx_bottom(struct r8152 *tp, int budget)
                if (urb->actual_length < ETH_ZLEN)
                        goto submit;
 
-               rx_desc = agg->head;
-               rx_data = agg->head;
+               rx_desc = agg->buffer;
+               rx_data = agg->buffer;
                len_used += sizeof(struct rx_desc);
 
                while (urb->actual_length > len_used) {
@@ -2051,7 +2042,7 @@ static int rx_bottom(struct r8152 *tp, int budget)
 find_next_rx:
                        rx_data = rx_agg_align(rx_data + pkt_len + ETH_FCS_LEN);
                        rx_desc = (struct rx_desc *)rx_data;
-                       len_used = (int)(rx_data - (u8 *)agg->head);
+                       len_used = (int)(rx_data - (u8 *)agg->buffer);
                        len_used += sizeof(struct rx_desc);
                }
 
@@ -2162,7 +2153,7 @@ int r8152_submit_rx(struct r8152 *tp, struct rx_agg *agg, 
gfp_t mem_flags)
                return 0;
 
        usb_fill_bulk_urb(agg->urb, tp->udev, usb_rcvbulkpipe(tp->udev, 1),
-                         agg->head, tp->rx_buf_sz,
+                         agg->buffer, tp->rx_buf_sz,
                          (usb_complete_t)read_bulk_callback, agg);
 
        ret = usb_submit_urb(agg->urb, mem_flags);
-- 
2.21.0