linux-kernel - Re: DST/BT878 module customization (.. was: Critical points about ...)

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Message-Id: <1178031333.3958.63.camel@localhost>
Date:	Tue, 01 May 2007 11:55:33 -0300
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	Markus Rechberger <mrechberger@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-dvb@...uxtv.org,
	Manu Abraham <abraham.manu@...il.com>
Subject: Re: DST/BT878 module customization (.. was: Critical points about
	...)

Hi Markus,

Em Seg, 2007-04-30 às 23:17 +0200, Markus Rechberger escreveu:
> Hi,
> 
> Trent Piepho wrote another patch for it, it just completes Uwe's patch
> in the end.
> 
> http://linuxtv.org/hg/~tap/dst-new?cmd=changeset;node=bbdd2b53cd5c;style=gitweb

The above patch plus the other on
http://linuxtv.org/hg/~tap/dst-new?cmd=changeset;node=32fb55ac9501;style=gitweb

Implements properly the Uwe's ide. 

However, I did a test here applying both patches, and de-selecting dst
drivers.

With this configuration, dvb-bt8xx hangs during initialization,
generating an OOPS, if you have a board with DST (modprobe dvb-bt8xx
never returns).

$ ps ax|grep modprobe
 2769 pts/0    S      0:00 modprobe dvb_bt8xx
 2779 pts/0    S+     0:00 grep --color modprobe

$ dmesg
DVB: registering new adapter (bttv0).
DVB: Unable to find symbol dst_attach()
Unable to handle kernel NULL pointer dereference at 00000000000002f0 RIP:
<ffffffff8825f11b>{:dvb_bt8xx:dvb_bt8xx_probe+3195}
PGD 7cfba067 PUD 7cfc5067 PMD 0
Oops: 0000 [1] SMP
CPU 0
Modules linked in: dvb_bt8xx dvb_core cx8800 cx88xx bt878 usbhid dvb_pll tuner bttv video_buf firmware_class ir_common i2c_algo_bit btcx_risc tveeprom i2c_core pcspkr sn9c102 compat_ioctl32 videodev v4l1_compat v4l2_common forcedeth kqemu joydev analog gameport ohci1394 ieee1394 ehci_hcd ohci_hcd usbcore reiserfs sd_mod sata_nv libata scsi_mod
Pid: 1286, comm: modprobe Tainted: P      2.6.17.4 #1
RIP: 0010:[<ffffffff8825f11b>] <ffffffff8825f11b>{:dvb_bt8xx:dvb_bt8xx_probe+3195}
RSP: 0018:ffff81007c239e38  EFLAGS: 00010296
RAX: 000000000000002b RBX: ffff81007c05a800 RCX: 0000000000000003
RDX: 0000000000000000 RSI: 0000000000000292 RDI: ffffffff803905bc
RBP: 0000000000000000 R08: 0000000000004c72 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff81007c190000
R13: ffff81007c05a8d0 R14: ffff81007c05ac98 R15: ffff81007c05abc8
FS:  00002b8b39ddf6f0(0000) GS:ffffffff80476000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00000000000002f0 CR3: 000000007cfc2000 CR4: 00000000000006e0
Process modprobe (pid: 1286, threadinfo ffff81007c238000, task ffff81007dfd4960)
Stack: ffff81007c05acb0 ffff81007c05a870 000000717c1e31c0 ffff81007c190198
       ffff81007c190000 ffffffff88261940 ffffffff88261940 0000000000000000
       0000000000518130 ffffffff8026ce95
Call Trace: <ffffffff8026ce95>{driver_probe_device+101}
       <ffffffff8026d00a>{__driver_attach+122} <ffffffff8026cf90>{__driver_attach+0}
       <ffffffff8026c6f9>{bus_for_each_dev+73} <ffffffff8026c2e8>{bus_add_driver+136}
       <ffffffff80152977>{sys_init_module+199} <ffffffff80109d2a>{system_call+126}

Code: f6 04 25 f0 02 00 00 20 0f 84 01 ff ff ff e9 7d fd ff ff 66
RIP <ffffffff8825f11b>{:dvb_bt8xx:dvb_bt8xx_probe+3195} RSP <ffff81007c239e38>
CR2: 00000000000002f0

So, those patches aren't enough to fix the issue.

Cheers,
Mauro

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