Re: [sparc64] 2.6.18 unaligned accesses in eth1394

Will Simoneau
2006-10-10T13:29:48Z

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On 18:36 Mon 09 Oct , David Miller wrote:
> From: Will Simoneau <simoneau@ele.uri.edu>
> Date: Thu, 5 Oct 2006 17:15:44 -0400
>
> > The first one I seem to be able to fix by adding a get_unaligned() at
> > lines 1679-1680 of eth1394.c around eth->h_dest; the second one seems to
> > be triggered by this code:
>
> Right.
>
> > (gdb) list *ether1394_data_handler+0x914
> > 0xc94 is in ether1394_data_handler (drivers/ieee1394/eth1394.c:1264).
> > 1259 priv->stats.rx_dropped++;
> > 1260 dev_kfree_skb_any(skb);
> > 1261 goto bad_proto;
> > 1262 }
> > 1263
> > 1264 if (netif_rx(skb) == NET_RX_DROP) {
> > 1265 priv->stats.rx_errors++;
> > 1266 priv->stats.rx_dropped++;
> > 1267 goto bad_proto;
> > 1268 }
>
> Actually, I think this one is in eth1394_parse_encap().
>
> Can you test this patch and tell me if it makes both unaligned
> access problems go away? Thanks.
>
> diff --git a/drivers/ieee1394/eth1394.c b/drivers/ieee1394/eth1394.c
> index 8a7b8fa..78abb9b 100644
> --- a/drivers/ieee1394/eth1394.c
> +++ b/drivers/ieee1394/eth1394.c
> @@ -64,6 +64,7 @@ #include <linux/bitops.h>
> #include <linux/ethtool.h>
> #include <asm/uaccess.h>
> #include <asm/delay.h>
> +#include <asm/unaligned.h>
> #include <net/arp.h>
>
> #include "config_roms.h"
> @@ -894,6 +895,7 @@ static inline u16 ether1394_parse_encap(
> u16 maxpayload;
> struct eth1394_node_ref *node;
> struct eth1394_node_info *node_info;
> + __be64 guid;
>
> /* Sanity check. MacOSX seems to be sending us 131 in this
> * field (atleast on my Panther G5). Not sure why. */
> @@ -902,8 +904,9 @@ static inline u16 ether1394_parse_encap(
>
> maxpayload = min(eth1394_speedto_maxpayload[sspd], (u16)(1 << (max_rec + 1)));
>
> + guid = get_unaligned(&arp1394->s_uniq_id);
> node = eth1394_find_node_guid(&priv->ip_node_list,
> - be64_to_cpu(arp1394->s_uniq_id));
> + be64_to_cpu(guid));
> if (!node) {
> return 0;
> }
> @@ -1675,8 +1678,9 @@ #endif
> if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
> priv->bc_dgl++;
> } else {
> + __be64 guid = get_unaligned((u64 *)eth->h_dest);
> node = eth1394_find_node_guid(&priv->ip_node_list,
> - be64_to_cpu(*(u64*)eth->h_dest));
> + be64_to_cpu(guid));
> if (!node) {
> ret = -EAGAIN;
> goto fail;

I still get:

Kernel unaligned access at TPC[10162164] ether1394_reset_priv+0x2c/0xe0 [eth1394]
Kernel unaligned access at TPC[10163148] ether1394_data_handler+0xdd0/0x1060 [eth1394]

The second one triggers on every packet received, the first only triggers once in a while.

If you want more gdb info or a disassembly just ask.

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