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p54: fix lm87 checksum endianness

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This fixes the checksum calculation for lm87 firmwares
on big endian platforms, the device treats the data as
an array of 32-bit little endian values so the driver
needs to do that as well.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2008-12-01 18:19:36 +01:00 committed by John W. Linville
parent 0f70f39846
commit c912765926
1 changed files with 3 additions and 3 deletions
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6
drivers/net/wireless/p54/p54usb.c
View file

@ -244,13 +244,13 @@ static void p54u_tx_3887(struct ieee80211_hw *dev, struct sk_buff *skb,
usb_submit_urb(data_urb, GFP_ATOMIC);
}
static __le32 p54u_lm87_chksum(const u32 *data, size_t length)
static __le32 p54u_lm87_chksum(const __le32 *data, size_t length)
{
u32 chk = 0;
length >>= 2;
while (length--) {
chk ^= *data++;
chk ^= le32_to_cpu(*data++);
chk = (chk >> 5) ^ (chk << 3);
}
@ -270,7 +270,7 @@ static void p54u_tx_lm87(struct ieee80211_hw *dev, struct sk_buff *skb,
if (!data_urb)
return;
checksum = p54u_lm87_chksum((u32 *)skb->data, skb->len);
checksum = p54u_lm87_chksum((__le32 *)skb->data, skb->len);
hdr = (struct lm87_tx_hdr *)skb_push(skb, sizeof(*hdr));
hdr->chksum = checksum;
hdr->device_addr = addr;