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Subject[PATCH v3 2/3] net/usb/r8152: replace USB buffer from stack to DMA-able
Date
Allocate the required transfer buffer for usb_control_msg.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
---
drivers/net/usb/r8152.c | 91 +++++++++++++++++++++++++++++++++++--------------
1 file changed, 66 insertions(+), 25 deletions(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index ee13f9e..93a7baa 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -282,6 +282,8 @@ enum rtl_register_content {
#define RTL8152_RMS (VLAN_ETH_FRAME_LEN + VLAN_HLEN)
#define RTL8152_TX_TIMEOUT (HZ)

+#define RTL8152_MAX_TRANSFER_SIZE 8
+
/* rtl8152 flags */
enum rtl8152_flags {
RTL8152_UNPLUG = 0,
@@ -324,8 +326,10 @@ struct r8152 {
struct sk_buff *tx_skb, *rx_skb;
struct delayed_work schedule;
struct mii_if_info mii;
+ struct mutex transfer_mutex;
u32 msg_enable;
u16 ocp_base;
+ u8 *transfer_buf;
u8 version;
u8 speed;
};
@@ -344,17 +348,59 @@ static const int multicast_filter_limit = 32;
static
int get_registers(struct r8152 *tp, u16 value, u16 index, u16 size, void *data)
{
- return usb_control_msg(tp->udev, usb_rcvctrlpipe(tp->udev, 0),
+ int ret;
+ void *tmp;
+
+ if (size > RTL8152_MAX_TRANSFER_SIZE || !tp->transfer_buf) {
+ tmp = kmalloc(size, GFP_KERNEL);
+ if (!tmp)
+ return -ENOMEM;
+ } else {
+ mutex_lock(&tp->transfer_mutex);
+ tmp = tp->transfer_buf;
+ }
+
+ ret = usb_control_msg(tp->udev, usb_rcvctrlpipe(tp->udev, 0),
RTL8152_REQ_GET_REGS, RTL8152_REQT_READ,
- value, index, data, size, 500);
+ value, index, tmp, size, 500);
+
+ memcpy(data, tmp, size);
+
+ if (tmp == tp->transfer_buf)
+ mutex_unlock(&tp->transfer_mutex);
+ else
+ kfree(tmp);
+
+ return ret;
}

static
int set_registers(struct r8152 *tp, u16 value, u16 index, u16 size, void *data)
{
- return usb_control_msg(tp->udev, usb_sndctrlpipe(tp->udev, 0),
+ int ret;
+ void *tmp;
+
+ if (size > RTL8152_MAX_TRANSFER_SIZE || !tp->transfer_buf) {
+ tmp = kmalloc(size, GFP_KERNEL);
+ if (!tmp)
+ return -ENOMEM;
+ } else {
+ mutex_lock(&tp->transfer_mutex);
+ tmp = tp->transfer_buf;
+ }
+
+ memcpy(tmp, data, size);
+
+ ret = usb_control_msg(tp->udev, usb_sndctrlpipe(tp->udev, 0),
RTL8152_REQ_SET_REGS, RTL8152_REQT_WRITE,
- value, index, data, size, 500);
+ value, index, tmp, size, 500);
+
+ if (tmp == tp->transfer_buf)
+ mutex_unlock(&tp->transfer_mutex);
+ else
+ kfree(tmp);
+
+ return ret;
}

static int generic_ocp_read(struct r8152 *tp, u16 index, u16 size,
@@ -685,21 +731,14 @@ static void ocp_reg_write(struct r8152 *tp, u16 addr, u16 data)
static inline void set_ethernet_addr(struct r8152 *tp)
{
struct net_device *dev = tp->netdev;
- u8 *node_id;
-
- node_id = kmalloc(sizeof(u8) * 8, GFP_KERNEL);
- if (!node_id) {
- netif_err(tp, probe, dev, "out of memory");
- return;
- }
+ u8 node_id[8] = {0};

- if (pla_ocp_read(tp, PLA_IDR, sizeof(u8) * 8, node_id) < 0)
+ if (pla_ocp_read(tp, PLA_IDR, sizeof(node_id), node_id) < 0)
netif_notice(tp, probe, dev, "inet addr fail\n");
else {
memcpy(dev->dev_addr, node_id, dev->addr_len);
memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
}
- kfree(node_id);
}

static int rtl8152_set_mac_address(struct net_device *netdev, void *p)
@@ -882,15 +921,10 @@ static void rtl8152_set_rx_mode(struct net_device *netdev)
static void _rtl8152_set_rx_mode(struct net_device *netdev)
{
struct r8152 *tp = netdev_priv(netdev);
- u32 tmp, *mc_filter; /* Multicast hash filter */
+ u32 mc_filter[2]; /* Multicast hash filter */
+ __le32 tmp[2];
u32 ocp_data;

- mc_filter = kmalloc(sizeof(u32) * 2, GFP_KERNEL);
- if (!mc_filter) {
- netif_err(tp, link, netdev, "out of memory");
- return;
- }
-
clear_bit(RTL8152_SET_RX_MODE, &tp->flags);
netif_stop_queue(netdev);
ocp_data = ocp_read_dword(tp, MCU_TYPE_PLA, PLA_RCR);
@@ -918,14 +952,12 @@ static void _rtl8152_set_rx_mode(struct net_device *netdev)
}
}

- tmp = mc_filter[0];
- mc_filter[0] = __cpu_to_le32(swab32(mc_filter[1]));
- mc_filter[1] = __cpu_to_le32(swab32(tmp));
+ tmp[0] = __cpu_to_le32(swab32(mc_filter[1]));
+ tmp[1] = __cpu_to_le32(swab32(mc_filter[0]));

- pla_ocp_write(tp, PLA_MAR, BYTE_EN_DWORD, sizeof(u32) * 2, mc_filter);
+ pla_ocp_write(tp, PLA_MAR, BYTE_EN_DWORD, sizeof(tmp), tmp);
ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RCR, ocp_data);
netif_wake_queue(netdev);
- kfree(mc_filter);
}

static netdev_tx_t rtl8152_start_xmit(struct sk_buff *skb,
@@ -1644,6 +1676,7 @@ static int rtl8152_probe(struct usb_interface *intf,
tp = netdev_priv(netdev);
tp->msg_enable = 0x7FFF;

+ mutex_init (&tp->transfer_mutex);
tasklet_init(&tp->tl, rx_fixup, (unsigned long)tp);
INIT_DELAYED_WORK(&tp->schedule, rtl_work_func_t);

@@ -1655,6 +1688,12 @@ static int rtl8152_probe(struct usb_interface *intf,
SET_ETHTOOL_OPS(netdev, &ops);
tp->speed = 0;

+ tp->transfer_buf = kmalloc(RTL8152_MAX_TRANSFER_SIZE, GFP_KERNEL);
+ if (!tp->transfer_buf) {
+ netif_err(tp, probe, netdev, "out of memory");
+ goto out;
+ }
+
tp->mii.dev = netdev;
tp->mii.mdio_read = read_mii_word;
tp->mii.mdio_write = write_mii_word;
@@ -1728,6 +1767,8 @@ static void rtl8152_disconnect(struct usb_interface *intf)
free_all_urbs(tp);
if (tp->rx_skb)
dev_kfree_skb(tp->rx_skb);
+ if (tp->transfer_buf)
+ kfree(tp->transfer_buf);
free_netdev(tp->netdev);
}
}
--
1.8.3.1


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