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ipwireless: Remove endian-dependent bitfields

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ipwireless: Remove endian-dependent bitfields

Remove endian-dependent bitfields and use bitmasks to transform
packet header bitfields from/to machine order.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Sterba 2008-07-28 16:53:00 +02:00 committed by Linus Torvalds
parent 622e713e8e
commit d54c2752f6
1 changed files with 38 additions and 13 deletions
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51
drivers/char/pcmcia/ipwireless/hardware.c
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@ -132,29 +132,17 @@ enum {
#define NL_FOLLOWING_PACKET_HEADER_SIZE 1
struct nl_first_packet_header {
#if defined(__BIG_ENDIAN_BITFIELD)
unsigned char packet_rank:2;
unsigned char address:3;
unsigned char protocol:3;
#else
unsigned char protocol:3;
unsigned char address:3;
unsigned char packet_rank:2;
#endif
unsigned char length_lsb;
unsigned char length_msb;
};
struct nl_packet_header {
#if defined(__BIG_ENDIAN_BITFIELD)
unsigned char packet_rank:2;
unsigned char address:3;
unsigned char protocol:3;
#else
unsigned char protocol:3;
unsigned char address:3;
unsigned char packet_rank:2;
#endif
};
/* Value of 'packet_rank' above */
@ -382,7 +370,37 @@ static void dump_data_bytes(const char *type, const unsigned char *data,
length < DUMP_MAX_BYTES ? length : DUMP_MAX_BYTES);
}
static int do_send_fragment(struct ipw_hardware *hw, const unsigned char *data,
static void swap_packet_bitfield_to_le(unsigned char *data)
{
#ifdef __BIG_ENDIAN_BITFIELD
unsigned char tmp = *data, ret = 0;
/*
* transform bits from aa.bbb.ccc to ccc.bbb.aa
*/
ret |= tmp & 0xc0 >> 6;
ret |= tmp & 0x38 >> 1;
ret |= tmp & 0x07 << 5;
*data = ret & 0xff;
#endif
}
static void swap_packet_bitfield_from_le(unsigned char *data)
{
#ifdef __BIG_ENDIAN_BITFIELD
unsigned char tmp = *data, ret = 0;
/*
* transform bits from ccc.bbb.aa to aa.bbb.ccc
*/
ret |= tmp & 0xe0 >> 5;
ret |= tmp & 0x1c << 1;
ret |= tmp & 0x03 << 6;
*data = ret & 0xff;
#endif
}
static int do_send_fragment(struct ipw_hardware *hw, unsigned char *data,
unsigned length)
{
unsigned i;
@ -402,6 +420,7 @@ static int do_send_fragment(struct ipw_hardware *hw, const unsigned char *data,
spin_lock_irqsave(&hw->lock, flags);
hw->tx_ready = 0;
swap_packet_bitfield_to_le(data);
if (hw->hw_version == HW_VERSION_1) {
outw((unsigned short) length, hw->base_port + IODWR);
@ -458,6 +477,10 @@ static int do_send_packet(struct ipw_hardware *hw, struct ipw_tx_packet *packet)
if (data_left < fragment_data_len)
fragment_data_len = data_left;
/*
* hdr_first is now in machine bitfield order, which will be swapped
* to le just before it goes to hw
*/
pkt.hdr_first.protocol = packet->protocol;
pkt.hdr_first.address = packet->dest_addr;
pkt.hdr_first.packet_rank = 0;
@ -883,6 +906,8 @@ static void do_receive_packet(struct ipw_hardware *hw)
acknowledge_data_read(hw);
swap_packet_bitfield_from_le(pkt);
if (ipwireless_debug)
dump_data_bytes("recv", pkt, len);