ATAPI burners support - significant regression in 5.x

[Maxim Sobolev]

Maxim Sobolev wrote:

> Indeed, the problem appears to be finally fixed - I can't reproduce it 
> anymore. At least I've been burning one of my 24x RWs in a loop during 
> the past 2 hours without any problems.
> 
> Please don't forget to do MT5 after several days.

Soren,

Can you please MFC the change in question?

Thanks!

-Maxim

> 
> Thank you very much!
> 
> -Maxim
> 
> Søren Schmidt wrote:
> 
>> Maxim Sobolev wrote:
>>
>>> I've noticed that quality of support for ATAPI CD burners in 5.x has 
>>> degraded significantly. Often when burning CD-RW (I have not 
>>> experimented on CD-Rs for obvious reasons), burncd hangs in the 
>>> middle, without any error messages. When it happens it doesn't 
>>> respond to SIGKILL, eject button doesn't work and the only way to 
>>> recover form this situation without reboot is to run atacontrol 
>>> reinit. I've tested 3 different CD-RW devices on 3 different machines 
>>> (2 runnning RELENG_5 and one running RELENG_5_2), and the same 
>>> problem exists on all of them. All machines were idle during my 
>>> experiments.
>>>
>>> The easy way to reproduce this problem is to create some dummy iso 
>>> image (e.g. dd if=/dev/random of=/tmp/tmp.iso bs=1m count=650), put 
>>> blank CD-RW medium into the burner and then run something along the 
>>> lines:
>>>
>>> while true; do time burncd -s max data /tmp/tmp.iso; burncd -s max 
>>> fixate; burncd -s max blank; sleep 5; done
>>>
>>> I've tried RW mediums with various speed ratings: 2x-4x, 4x-12x, 
>>> 16x-24x the problem happens with all of them. It also makes no 
>>> difference whether the medium is new or used.
>>>
>>> Turning DMA on or off doesn't solve the problem either.
>>>
>>> All is matter of time - sooner or later burncd hangs solidly, usually 
>>> 30 minutes is enough to reproduce the problem.
>>>
>>> IMHO it is quite significant problem that have to be addressed before 
>>> the 5.3 is out. At least if I am not correct and the problem happens 
>>> due to  problems with particular CD-RW devices, ata driver has to be 
>>> "smarter" to recover from such situation gracefully, returning error 
>>> code and leaving device in the useable position.
>>
>>
>>
>> Does this happen on an up to date -current ? I'm pretty sure I fixed 
>> this some time ago, but I could be wrong as I was only able to 
>> reproduce this ecactly once. The problem was a race in ata_start where 
>> it could loose a request. The only way to get it back "online" was to 
>> get ata_start called again by fx issueing a command though another 
>> channel (ioctl, atapicam).
>>
>> -Søren
>>
>>
>>
>>
> 
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