Hi, this is an unknown problem. In fact it's the first time i ever got an error report for the device. And therefore there isn't any patch. There seems to be a usb write error. This is a diy hardware. There may be several reasons causing such problems: Hardware problems on the i2c-tiny-usb: - Have correct zener diodes (fast ones!) been used? - Is the PCB home made? If yes is it really reliable? - How long is the usb cable? General problems: - What is connected to the i2c-tiny-usb? - How much power does it draw? - Is the nslu really able to power everything via usb? (e.g. what happens if the i2c-tiny-usb is connected through a self powered hub?) Maybe the arm kernel barfs on i2c/usb transfer problems? Till Am Montag 09 Februar 2009 schrieb Martin Michlmayr: > Hi Till and other I2C developers, > > Thomas Koch, a Debian user, reported the following backtrace with > 2.6.26 related to i2c and possibly related to the i2c-tiny-usb driver. > This is on an ARM device. > > Do you know if this is a known issue for which a patch is available in > newer kernels, or is this a new bug? > > > [42994982.810000] Unable to handle kernel paging request at virtual address 692f7473 > > [42994982.810000] pgd = c1da0000 > > [42994982.810000] [692f7473] *pgd=00000000 > > [42994982.810000] Internal error: Oops: f3 [#2] > > [42994982.810000] Modules linked in: ipv6 nfsd auth_rpcgss exportfs nfs lockd nfs_acl sunrpc nls_utf8 ntfs nls_base ext2 evdev ftdi_sio usbhid hid i2c_tiny_usb ff_memless usbserial ixp4xx_eth ixp4xx_npe firmware_class ixp4xx_qmgr ixp4xx_beeper ohci_hcd ext3 jbd mbcache sd_mod ehci_hcd usb_storage usbcorescsi_mod > > [42994982.810000] CPU: 0 Tainted: G D (2.6.26-1-ixp4xx #1) > > [42994982.810000] PC is at module_put+0x20/0x48 > > [42994982.810000] LR is at i2c_put_adapter+0x14/0x18 > > [42994982.810000] pc : [<c0060b00>] lr : [<c01940f4>] psr: 20000093 > > [42994982.810000] sp : c0fc3c68 ip : c0fc3c78 fp : c0fc3c74 > > [42994982.810000] r10: c18d3dd8 r9 : c1c0d120 r8 : 00000000 > > [42994982.810000] r7 : c1c1a208 r6 : 00000008 r5 : c1daaac0 r4 : c13fe000 > > [42994982.810000] r3 : 20000093 r2 : 20000013 r1 : c1daaac0 r0 : 692f7373 > > [42994982.810000] Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user > > [42994982.810000] Control: 0000397f Table: 01da0000 DAC: 00000015 > > [42994982.810000] Process hcontrol (pid: 2671, stack limit = 0xc0fc2268) > > [42994982.810000] Stack: (0xc0fc3c68 to 0xc0fc4000) > > [42994982.810000] 3c60: c0fc3c84 c0fc3c78 c01940f4 c0060aec c0fc3c9c c0fc3c88 > > [42994982.810000] 3c80: c0195d94 c01940ec c1daaac0 c0f0ea60 c0fc3cd4 c0fc3ca0 c009813c c0195d84 > > [42994982.810000] 3ca0: 00000000 c0ef9d30 00000000 c1daaac0 c1c1a200 00000000 c1c1a208 00000000 > > [42994982.810000] 3cc0: 000000f3 00000001 c0fc3ce4 c0fc3cd8 c00984c4 c0098090 c0fc3d04 c0fc3ce8 > > [42994982.810000] 3ce0: c0094dd0 c009849c c0f16e00 c1c1a200 00000003 0000000c c0fc3d2c c0fc3d08 > > [42994982.810000] 3d00: c0040980 c0094d64 c0f16e00 c0fc2000 c1e68060 0000000b c01941f8 00000008 > > [42994982.810000] 3d20: c0fc3d3c c0fc3d30 c0040a00 c0040904 c0fc3d54 c0fc3d40 c0041cf8 c00409e4 > > [42994982.810000] 3d40: c003e550 c003e420 c0fc3d64 c0fc3d58 c0029de4 c0041aec c0fc3d84 c0fc3d68 > > [42994982.810000] 3d60: c002c460 c0029b70 c0fc3ea0 000000f3 692f7265 c0fc3ea0 c0fc3dac c0fc3d88 > > [42994982.810000] 3d80: c002c718 c002c400 e5933000 c021db38 00000013 00000000 e5933000 00000000 > > [42994982.810000] 3da0: c0fc3dec c0fc3db0 c002e584 c002c6b4 00000000 c02c0a68 28841963 0000b229 > > [42994982.810000] 3dc0: c0fc3df4 ffffffff c02bc1bc 000000f3 c0fc3ea0 692f7265 60000013 00000000 > > [42994982.810000] 3de0: c0fc3e9c c0fc3df0 c00251f0 c002e150 c005b76c c02bc4cc c0fc3e24 c0fc3e08 > > [42994982.810000] 3e00: c003080c c00307a8 c02c1680 c02c1680 00000005 00000000 c0fc3e3c c0fc3e28 > > [42994982.810000] 3e20: c0043e2c c0037468 00000005 00000005 c0fc3e5c c0fc3e40 c002504c c0043dd4 > > [42994982.810000] 3e40: c005b878 ffffffff 0000001f 00000020 c0fc3eec c0fc3e60 c00256b0 c002500c > > [42994982.810000] 3e60: 00000001 c02c0a70 c0f374c0 00000001 2883b65f 0000b229 c0fc3f10 ffffffff > > [42994982.810000] 3e80: c0fc3ed4 be932b55 c051d360 c0025c48 c0fc3f04 c0fc3ea0 c002566c c00251c0 > > [42994982.810000] 3ea0: c0fc2028 c0fc3f0c 00000001 692f7265 c1c73a08 00000001 be932b55 c051d360 > > [42994982.810000] 3ec0: c0025c48 c0fc2000 00000000 c0fc3f04 c0fc3f08 c0fc3ee8 c0194cd4 c01941f8 > > [42994982.810000] 3ee0: a0000013 ffffffff 00000001 00000001 be932b55 c051d360 c0fc3f2c c0fc3f08 > > [42994982.810000] 3f00: c0194cd4 c01941ec c0fc3f4c 0001004b c13f0001 c051d360 be932b55 fffffff4 > > [42994982.810000] 3f20: c0fc3f4c c0fc3f30 c01961ac c0194c98 c1daaac0 be932b55 c0fc3f78 00000001 > > [42994982.810000] 3f40: c0fc3f74 c0fc3f50 c0097778 c0196170 006d6561 00000a6f c1daaac0 fffffff7 > > [42994982.810000] 3f60: 00000000 00000000 c0fc3fa4 c0fc3f78 c0097c44 c00976d0 00000000 00000000 > > [42994982.810000] 3f80: 00000000 00000000 0000d6fc 00000000 000090a0 00000003 00000000 c0fc3fa8 > > [42994982.810000] 3fa0: c0025aa0 c0097c0c 0000d6fc 00000000 00000003 be932b55 00000001 be932b55 > > [42994982.810000] 3fc0: 0000d6fc 00000000 000090a0 00000003 00000000 00000000 40025000 be932b6c > > [42994982.810000] 3fe0: 00000000 be932a40 0000b4ac 40209eac 40000010 00000003 0002003d 00000000 > > [42994982.810000] Backtrace: > > [42994982.810000] [<c0060ae0>] (module_put+0x0/0x48) from [<c01940f4>] (i2c_put_adapter+0x14/0x18) > > [42994982.810000] [<c01940e0>] (i2c_put_adapter+0x0/0x18) from [<c0195d94>] (i2cdev_release+0x1c/0x30) > > [42994982.810000] [<c0195d78>] (i2cdev_release+0x0/0x30) from [<c009813c>] (__fput+0xb8/0x178) > > [42994982.810000] r5:c0f0ea60 r4:c1daaac0 > > [42994982.810000] [<c0098084>] (__fput+0x0/0x178) from [<c00984c4>] (fput+0x34/0x38) > > [42994982.810000] [<c0098490>] (fput+0x0/0x38) from [<c0094dd0>] (filp_close+0x78/0x84) > > [42994982.810000] [<c0094d58>] (filp_close+0x0/0x84) from [<c0040980>] (put_files_struct+0x88/0xe0) > > [42994982.810000] r6:0000000c r5:00000003 r4:c1c1a200 > > [42994982.810000] [<c00408f8>] (put_files_struct+0x0/0xe0) from [<c0040a00>] (exit_files+0x28/0x2c) > > [42994982.810000] r8:00000008 r7:c01941f8 r6:0000000b r5:c1e68060 r4:c0fc2000 > > [42994982.810000] [<c00409d8>] (exit_files+0x0/0x2c) from [<c0041cf8>] (do_exit+0x218/0x6a4) > > [42994982.810000] [<c0041ae0>] (do_exit+0x0/0x6a4) from [<c0029de4>] (die+0x280/0x304) > > [42994982.810000] [<c0029b64>] (die+0x0/0x304) from [<c002c460>] (__do_kernel_fault+0x6c/0x80) > > [42994982.810000] [<c002c3f4>] (__do_kernel_fault+0x0/0x80) from [<c002c718>] (do_bad_area+0x70/0x7c) > > [42994982.810000] r7:c0fc3ea0 r6:692f7265 r5:000000f3 r4:c0fc3ea0 > > [42994982.810000] [<c002c6a8>] (do_bad_area+0x0/0x7c) from [<c002e584>] (do_alignment+0x440/0x59c) > > [42994982.810000] r6:00000000 r5:e5933000 r4:00000000 > > [42994982.810000] [<c002e144>] (do_alignment+0x0/0x59c) from [<c00251f0>] (do_DataAbort+0x3c/0xa0) > > [42994982.810000] [<c00251b4>] (do_DataAbort+0x0/0xa0) from [<c002566c>] (__dabt_svc+0x4c/0x60) > > [42994982.810000] Exception stack(0xc0fc3ea0 to 0xc0fc3ee8) > > [42994982.810000] 3ea0: c0fc2028 c0fc3f0c 00000001 692f7265 c1c73a08 00000001 be932b55 c051d360 > > [42994982.810000] 3ec0: c0025c48 c0fc2000 00000000 c0fc3f04 c0fc3f08 c0fc3ee8 c0194cd4 c01941f8 > > [42994982.810000] 3ee0: a0000013 ffffffff > > [42994982.810000] r8:c0025c48 r7:c051d360 r6:be932b55 r5:c0fc3ed4 r4:ffffffff > > [42994982.810000] [<c01941e0>] (i2c_transfer+0x0/0x98) from [<c0194cd4>] (i2c_master_recv+0x48/0x58) > > [42994982.810000] r7:c051d360 r6:be932b55 r5:00000001 r4:00000001 > > [42994982.810000] [<c0194c8c>] (i2c_master_recv+0x0/0x58) from [<c01961ac>] (i2cdev_read+0x48/0xa0) > > [42994982.810000] r4:fffffff4 > > [42994982.810000] [<c0196164>] (i2cdev_read+0x0/0xa0) from [<c0097778>] (vfs_read+0xb4/0x18c) > > [42994982.810000] r7:00000001 r6:c0fc3f78 r5:be932b55 r4:c1daaac0 > > [42994982.810000] [<c00976c4>] (vfs_read+0x0/0x18c) from [<c0097c44>] (sys_read+0x44/0x70) > > [42994982.810000] r7:00000000 r6:00000000 r5:fffffff7 r4:c1daaac0 > > [42994982.810000] [<c0097c00>] (sys_read+0x0/0x70) from [<c0025aa0>] (ret_fast_syscall+0x0/0x2c) > > [42994982.810000] r7:00000003 r6:000090a0 r5:00000000 r4:0000d6fc > > [42994982.810000] Code: 0a00000b e10f2000 e3823080 e121f003 (e5903100) > > [42994983.440000] ---[ end trace 051f259b86cac584 ]--- > > and: > > * Thomas Koch <tom-koch@xxxxxx> [2009-02-04 05:12]: > > > Can you please tell us more: when does this happen, how often, how > > > reliably can you reproduce this problem, etc? > > > > This happens several times a day. > > The system is a linksys nslu2. > > It looks like it has something to do with the i2c-tiny-usb driver. > > > > [43177942.750000] i2c-adapter i2c-1: failure writing data > > [43177942.880000] hub 1-1:1.0: port 1 disabled by hub (EMI?), re-enabling... > > [43177942.880000] usb 1-1.1: USB disconnect, address 17 > > [43177942.970000] usb 1-1.1: new low speed USB device using ehci_hcd and > > address 18 > > [43177943.090000] usb 1-1.1: configuration #1 chosen from 1 choice > > [43177943.100000] i2c-tiny-usb 1-1.1:1.0: version 2.05 found at bus 001 > > address 018 > > [43177943.130000] i2c-adapter i2c-1: connected i2c-tiny-usb device > > [43177943.140000] usb 1-1.1: New USB device found, idVendor=0403, > > idProduct=c631 > > [43177943.140000] usb 1-1.1: New USB device strings: Mfr=1, Product=2, > > SerialNumber=0 > > [43177943.150000] usb 1-1.1: Product: i2c-tiny-usb > > [43177943.160000] usb 1-1.1: Manufacturer: Till Harbaum > > > > Most of the time I can see it after the device is registered again. > > > > Thanks, > > Thomas > -- Dr. Till Harbaum <Till@xxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
