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    SubjectRe: dm9000 patch
    Hi all,

    just FYI, i tested kernel 2.6.36.2, unfortunately the issue is still
    there, below the call stack trace.

    [ 4.620000] eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
    [ 39.390000] BUG: spinlock recursion on CPU#0, httpd/29
    [ 39.390000] lock: 00189c44, .magic: dead4ead, .owner: httpd/29,
    .owner_cpu: 0
    [ 39.390000] Stack from 00d6a990:
    [ 39.390000] 00d6a9bc 000a9710 0017cac7 00189c44 dead4ead
    00de48f4 0000001d 00000000
    [ 39.390000] 00189c44 0002a646 00145f70 00d6a9f0 000a98e2
    00189c44 0017cb2d 00189c44
    [ 39.390000] 00d6aad8 0000001f 00145f5c 001523f6 00189c08
    0002a646 00145f70 0002bc52
    [ 39.390000] 00d6a9fc 00145f7e 00189c44 00d6aa28 0002a75e
    00189c44 0000001f 00d6aad8
    [ 39.390000] 0000001f 00145f5c 00189c08 0002a646 00145f70
    0002bc52 00d6aa3c 00000bb6
    [ 39.390000] 0000001f 00189c44 00cfc780 00d6aa84 0000337a
    0000001f 00d6aa4c 00000001
    [ 39.390000] Call Trace:
    [ 39.390000] [000a9710] spin_bug+0x86/0x11a
    [ 39.390000] [000a98e2] do_raw_spin_lock+0x58/0x120
    [ 39.390000] [00145f7e] _raw_spin_lock+0xe/0x14
    [ 39.390000] [0002a75e] __do_IRQ+0x2c/0x108
    [ 39.390000] [00000bb6] do_IRQ+0x48/0x62
    [ 39.390000] [0000337a] inthandler+0x6a/0x74
    [ 39.390000] [0002a82e] __do_IRQ+0xfc/0x108
    [ 39.390000] [00000bb6] do_IRQ+0x48/0x62
    [ 39.390000] [0000337a] inthandler+0x6a/0x74
    [ 39.390000] [000ef0ce] skb_release_all+0x10/0x20
    [ 39.390000] [000ee6bc] __kfree_skb+0x10/0x92
    [ 39.390000] [000ee75e] consume_skb+0x20/0x34
    [ 39.390000] [000e004e] dm9000_start_xmit+0xdc/0xec
    [ 39.390000] [000f67a2] dev_hard_start_xmit+0x146/0x472
    [ 39.390000] [00106506] sch_direct_xmit+0xc0/0x1bc
    [ 39.390000] [000f9914] dev_queue_xmit+0x160/0x3e4
    [ 39.390000] [00113b3e] ip_finish_output+0xee/0x318
    [ 39.390000] [001142b4] ip_output+0x7c/0x88
    [ 39.390000] [00113dc6] ip_local_out+0x26/0x30
    [ 39.390000] [00114d9a] ip_queue_xmit+0x152/0x374
    [ 39.390000] [00125c8c] tcp_transmit_skb+0x3f0/0x732
    [ 39.390000] [00126f26] tcp_write_xmit+0x178/0x868
    [ 39.390000] [00127644] __tcp_push_pending_frames+0x2e/0x9a
    [ 39.390000] [0011c3d6] tcp_sendmsg+0x82e/0x98c
    [ 39.390000] [00137544] inet_sendmsg+0x32/0x54
    [ 39.390000] [000e79a6] sock_aio_write+0xc8/0x138
    [ 39.390000] [00042590] do_sync_write+0x9e/0xfe
    [ 39.390000] [00042668] vfs_write+0x78/0x84
    [ 39.390000] [00042a92] sys_write+0x40/0x7a
    [ 39.390000] [00003224] system_call+0x84/0xc2
    [ 39.390000]

    dm9000e is as default not visible/selectable in menuconfig for Coldfire
    architectures, so this probably cannot be considered as a kernel bug.

    I going forward in investigations, every help is appreciated,

    regards,
    angelo



    On 29/12/2010 07:06, Baruch Siach wrote:
    > Hi Angelo,
    >
    > On Tue, Dec 28, 2010 at 10:52:42PM +0100, Angelo Dureghello wrote:
    >
    >> sorry to contact you directly but i couldn't get any help from the
    >> kernel.org mailing list, since i am not a developer my mails are
    >> generally skipped.
    >>
    > The best way to get the contact info for a piece of kernel code, is using the
    > get_maintainer.pl script. Running 'scripts/get_maintainer.pl -f
    > drivers/net/dm9000.c' gives the following output:
    >
    > netdev@vger.kernel.org
    > linux-kernel@vger.kernel.org
    >
    > I added both to Cc.
    >
    >
    >> I am very near to have a custom board working with MCF5307 cpu and dm9000.
    >> I am using kernel 2.6.36-rc3 with your last patch about
    >> spinlock-recursion already included.
    >>
    > You should try to update to the latest .36 kernel, which is currently
    > 2.6.36.2. The problem that you experience might be unrelated to the dm9000
    > driver (or to networking at all), so it might have been fixed in this version.
    >
    >
    >> I have "ping" and "telnet" to the embedded board fully working.
    >> If i try to get a sample web page with some images from the board
    >> httpd with a browser, in 80% of cases i get a trap/oops:
    >>
    > Try to enable KALLSYMS in your kernel .config to make your stack trace more
    > meaningful. This is under 'General setup -> Configure standard kernel features
    > (for small systems) -> Load all symbols for debugging/ksymoops'.
    >
    > I hope this helps.
    >
    > baruch
    >
    >
    >> [ 4.590000] eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
    >> [ 67.630000] BUG: spinlock recursion on CPU#0, httpd/29
    >> [ 67.630000] lock: 00c42c06, .magic: dead4ead, .owner: httpd/29,
    >> .owner_cpu: 0
    >> [ 67.630000] Stack from 00d7b914:
    >> [ 67.630000] 00d7b940 000a8cf0 0015f693 00c42c06 dead4ead
    >> 00dec1d4 0000001d 00000000
    >> [ 67.630000] 00c42c06 00006188 00c42800 00d7b974 000a8ec2
    >> 00c42c06 0015f6f9 00002704
    >> [ 67.630000] 00000000 0000001f 00146fa4 00152f0c 00c42b60
    >> 00006188 00c42800 0002b312
    >> [ 67.630000] 00d7b984 0014701e 00c42c06 00000000 00d7b9c4
    >> 000df21c 00c42c06 00000000
    >> [ 67.630000] 00000000 0000001f 00146fa4 00152f0c 000005ea
    >> 00cfc640 00006188 000096e8
    >> [ 67.630000] 0002b312 00146fa4 00c42b60 00002704 00d7b9ec
    >> 00029d3a 0000001f 00c42800
    >> [ 67.630000] Call Trace:
    >> [ 67.630000] [000a8cf0] [000a8ec2] [0014701e] [000df21c] [00029d3a]
    >> [ 67.630000] [00029e84] [00000bb6] [0000336e] [000df162] [000effd6]
    >> [ 67.630000] [00100482] [000f312e] [000f9ebc] [0010dd2a] [0010e4a0]
    >> [ 67.630000] [0010dfb2] [0010ef80] [0011fed6] [00121170] [0012188e]
    >> [ 67.630000] [0011ecc6] [001249fe] [000e4084] [0011621c] [00131a44]
    >> [ 67.630000] [000e11ee] [00041944] [00041a1c] [00041e46] [00003218]
    >> [ 67.630000] BUG: spinlock lockup on CPU#0, httpd/29, 00c42c06
    >> [ 67.630000] Stack from 00d7b934:
    >> [ 67.630000] 00d7b974 000a8f66 0015f703 00000000 00dec1d4
    >> 0000001d 00c42c06 00002704
    >> [ 67.630000] 00000000 0000001f 00146fa4 00152f0c 00c42b60
    >> 00006188 00c42800 0002b312
    >> [ 67.630000] 00d7b984 0014701e 00c42c06 00000000 00d7b9c4
    >> 000df21c 00c42c06 00000000
    >> [ 67.630000] 00000000 0000001f 00146fa4 00152f0c 000005ea
    >> 00cfc640 00006188 000096e8
    >> [ 67.630000] 0002b312 00146fa4 00c42b60 00002704 00d7b9ec
    >> 00029d3a 0000001f 00c42800
    >> [ 67.630000] 0016c1b4 00cfc640 0000001f 0016c178 00029d10
    >> 00146fb8 00d7ba20 00029e84
    >> [ 67.630000] Call Trace:
    >> [ 67.630000] [000a8f66] [0014701e] [000df21c] [00029d3a] [00029e84]
    >> [ 67.630000] [00000bb6] [0000336e] [000df162] [000effd6] [00100482]
    >> [ 67.630000] [000f312e] [000f9ebc] [0010dd2a] [0010e4a0] [0010dfb2]
    >> [ 67.630000] [0010ef80] [0011fed6] [00121170] [0012188e] [0011ecc6]
    >> [ 67.630000] [001249fe] [000e4084] [0011621c] [00131a44] [000e11ee]
    >> [ 67.630000] [00041944] [00041a1c] [00041e46] [00003218]
    >>
    >> As i said, i was hoping in your patch but i sadly discovered it is
    >> already included in this kernel version.
    >> Hope you can give me some help or can forward me to an appropriate
    >> mailing list.
    >>
    >



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