On Sun, 2007-07-15 at 14:17 +0200, Michael Buesch wrote:
> On Sunday 15 July 2007 14:07:44 Bryan Wu wrote:
> > @@ -483,9 +487,12 @@
> >
> > void setup_mac_addr(u8 * mac_addr)
> > {
> > + u32 addr_low = le32_to_cpu(*(u32 *) & mac_addr[0]);
> > + u16 addr_hi = le16_to_cpu(*(u16 *) & mac_addr[4]);
> > +
> > /* this depends on a little-endian machine */
> > - bfin_write_EMAC_ADDRLO(*(u32 *) & mac_addr[0]);
> > - bfin_write_EMAC_ADDRHI(*(u16 *) & mac_addr[4]);
> > + bfin_write_EMAC_ADDRLO(addr_low);
> > + bfin_write_EMAC_ADDRHI(addr_hi);
> > }
> >
> > static void adjust_tx_list(void)
> > @@ -866,10 +873,10 @@
> > int retval;
> >
> > /* Grab the MAC address in the MAC */
> > - *(u32 *) (&(dev->dev_addr[0])) = bfin_read_EMAC_ADDRLO();
> > - *(u16 *) (&(dev->dev_addr[4])) = (u16) bfin_read_EMAC_ADDRHI();
> > + *(u32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
> > + *(u16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
>
> Try something like this:
>
> @@ -483,9 +487,12 @@
>
> void setup_mac_addr(u8 * mac_addr)
> {
> + u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
> + u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);
> +
> - /* this depends on a little-endian machine */
> - bfin_write_EMAC_ADDRLO(*(u32 *) & mac_addr[0]);
> - bfin_write_EMAC_ADDRHI(*(u16 *) & mac_addr[4]);
> + bfin_write_EMAC_ADDRLO(addr_low);
> + bfin_write_EMAC_ADDRHI(addr_hi);
> }
>
> static void adjust_tx_list(void)
> @@ -866,10 +873,10 @@
> int retval;
>
> /* Grab the MAC address in the MAC */
> - *(u32 *) (&(dev->dev_addr[0])) = bfin_read_EMAC_ADDRLO();
> - *(u16 *) (&(dev->dev_addr[4])) = (u16) bfin_read_EMAC_ADDRHI();
> + *(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
> + *(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
>
Thanks a lot, Michael.
I got a generic question about this endianess check. When should use it
in a driver or something else? I grep it in the driver/net/
---
drivers/net/e100.c: ns->tx_window_errors += le32_to_cpu(s->tx_late_collisions);
drivers/net/e100.c: ns->tx_carrier_errors += le32_to_cpu(s->tx_lost_crs);
drivers/net/e100.c: ns->tx_fifo_errors += le32_to_cpu(s->tx_underruns);
drivers/net/e100.c: ns->tx_errors += le32_to_cpu(s->tx_max_collisions) +
drivers/net/e100.c: le32_to_cpu(s->tx_lost_crs);
drivers/net/e100.c: ns->rx_length_errors += le32_to_cpu(s->rx_short_frame_errors) +
drivers/net/e100.c: ns->rx_crc_errors += le32_to_cpu(s->rx_crc_errors);
drivers/net/e100.c: ns->rx_frame_errors += le32_to_cpu(s->rx_alignment_errors);
drivers/net/e100.c: ns->rx_over_errors += le32_to_cpu(s->rx_overrun_errors);
drivers/net/e100.c: ns->rx_fifo_errors += le32_to_cpu(s->rx_overrun_errors);
drivers/net/e100.c: ns->rx_missed_errors += le32_to_cpu(s->rx_resource_errors);
drivers/net/e100.c: ns->rx_errors += le32_to_cpu(s->rx_crc_errors) +
drivers/net/e100.c: le32_to_cpu(s->rx_alignment_errors) +
drivers/net/e100.c: le32_to_cpu(s->rx_short_frame_errors) +
drivers/net/e100.c: le32_to_cpu(s->rx_cdt_errors);
drivers/net/e100.c: nic->tx_deferred += le32_to_cpu(s->tx_deferred);
drivers/net/e100.c: le32_to_cpu(s->tx_single_collisions);
drivers/net/e100.c: le32_to_cpu(s->tx_multiple_collisions);
drivers/net/e100.c: nic->tx_fc_pause += le32_to_cpu(s->fc_xmt_pause);
drivers/net/e100.c: nic->rx_fc_pause += le32_to_cpu(s->fc_rcv_pause);
drivers/net/e100.c: le32_to_cpu(s->fc_rcv_unsupported);
drivers/net/e100.c: le32_to_cpu(cb->u.tcb.tbd.buf_addr),
drivers/net/e100.c: le32_to_cpu(cb->u.tcb.tbd.buf_addr),
---
Normally, it is used to protect some rx/tx status flags or dma buf addr.
Any guide line for this leXX_to_cpu usage?
Thanks again
- Bryan Wu
-
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