net/usb: kalmia: Various fixes for better support of non-x86 architectures.

-Support for big endian.
-Do not use USB buffers at the stack.
-Safer/more efficient code for local constants.

Signed-off-by: Marius B. Kotsbak <marius@kotsbak.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 16 deletions

diff --git a/drivers/net/usb/kalmia.c b/drivers/net/usb/kalmia.c
index d965fb1e013e..d4edeb2af9be 100644
--- a/drivers/net/usb/kalmia.c
+++ b/drivers/net/usb/kalmia.c
@@ -100,27 +100,35 @@ kalmia_send_init_packet(struct usbnet *dev, u8 *init_msg, u8 init_msg_len,
 static int
 kalmia_init_and_get_ethernet_addr(struct usbnet *dev, u8 *ethernet_addr)
 {
-        char init_msg_1[] =
+        const static char init_msg_1[] =
                 { 0x57, 0x50, 0x04, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00,
                 0x00, 0x00 };
-        char init_msg_2[] =
+        const static char init_msg_2[] =
                 { 0x57, 0x50, 0x04, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0xf4,
                 0x00, 0x00 };
-        char receive_buf[28];
+        const static int buflen = 28;
+        char *usb_buf;
         int status;
 
-        status = kalmia_send_init_packet(dev, init_msg_1, sizeof(init_msg_1)
-                / sizeof(init_msg_1[0]), receive_buf, 24);
+        usb_buf = kmalloc(buflen, GFP_DMA | GFP_KERNEL);
+        if (!usb_buf)
+                return -ENOMEM;
+
+        memcpy(usb_buf, init_msg_1, 12);
+        status = kalmia_send_init_packet(dev, usb_buf, sizeof(init_msg_1)
+                / sizeof(init_msg_1[0]), usb_buf, 24);
         if (status != 0)
                 return status;
 
-        status = kalmia_send_init_packet(dev, init_msg_2, sizeof(init_msg_2)
-                / sizeof(init_msg_2[0]), receive_buf, 28);
+        memcpy(usb_buf, init_msg_2, 12);
+        status = kalmia_send_init_packet(dev, usb_buf, sizeof(init_msg_2)
+                / sizeof(init_msg_2[0]), usb_buf, 28);
         if (status != 0)
                 return status;
 
-        memcpy(ethernet_addr, receive_buf + 10, ETH_ALEN);
+        memcpy(ethernet_addr, usb_buf + 10, ETH_ALEN);
 
+        kfree(usb_buf);
         return status;
 }
 
@@ -190,7 +198,8 @@ kalmia_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
         dev_kfree_skb_any(skb);
         skb = skb2;
 
-        done: header_start = skb_push(skb, KALMIA_HEADER_LENGTH);
+done:
+        header_start = skb_push(skb, KALMIA_HEADER_LENGTH);
         ether_type_1 = header_start[KALMIA_HEADER_LENGTH + 12];
         ether_type_2 = header_start[KALMIA_HEADER_LENGTH + 13];
 
@@ -201,9 +210,8 @@ kalmia_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
         header_start[0] = 0x57;
         header_start[1] = 0x44;
         content_len = skb->len - KALMIA_HEADER_LENGTH;
-        header_start[2] = (content_len & 0xff); /* low byte */
-        header_start[3] = (content_len >> 8); /* high byte */
 
+        put_unaligned_le16(content_len, &header_start[2]);
         header_start[4] = ether_type_1;
         header_start[5] = ether_type_2;
 
@@ -231,13 +239,13 @@ kalmia_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
          * Our task here is to strip off framing, leaving skb with one
          * data frame for the usbnet framework code to process.
          */
-        const u8 HEADER_END_OF_USB_PACKET[] =
+        const static u8 HEADER_END_OF_USB_PACKET[] =
                 { 0x57, 0x5a, 0x00, 0x00, 0x08, 0x00 };
-        const u8 EXPECTED_UNKNOWN_HEADER_1[] =
+        const static u8 EXPECTED_UNKNOWN_HEADER_1[] =
                 { 0x57, 0x43, 0x1e, 0x00, 0x15, 0x02 };
-        const u8 EXPECTED_UNKNOWN_HEADER_2[] =
+        const static u8 EXPECTED_UNKNOWN_HEADER_2[] =
                 { 0x57, 0x50, 0x0e, 0x00, 0x00, 0x00 };
-        u8 i = 0;
+        int i = 0;
 
         /* incomplete header? */
         if (skb->len < KALMIA_HEADER_LENGTH)
@@ -285,7 +293,7 @@ kalmia_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 
                 /* subtract start header and end header */
                 usb_packet_length = skb->len - (2 * KALMIA_HEADER_LENGTH);
-                ether_packet_length = header_start[2] + (header_start[3] << 8);
+                ether_packet_length = get_unaligned_le16(&header_start[2]);
                 skb_pull(skb, KALMIA_HEADER_LENGTH);
 
                 /* Some small packets misses end marker */