Re: [PATCH v13 1/9] scsi: sr: support runtime pm

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On 01/22/2013 05:13 PM, Oliver Neukum wrote:
> On Tuesday 22 January 2013 10:25:31 Aaron Lu wrote:
>> On Mon, Jan 21, 2013 at 03:56:43PM +0100, Oliver Neukum wrote:
>>> On Monday 21 January 2013 17:11:04 Aaron Lu wrote:
>>>> It is not easy for the OS to tell if the drive is being used or not
>>>> sometimes 
>>>>
>>>> Alan has reminded me it is possible for an app to open the block device
>>>> file(/dev/sr0), issue a command(play audio), then close the device file.
>>>> From the OS' point of view, we think nobody is using it. But actually,
>>>> the drive is playing cd for the user, so we can't suspend the device.
>>>
>>> Are there drives that support ZPODD and have an audio output?
>>
>> I'm afraid I don't know, since there are so many ODD makers.
>> But at least we can say, the SPEC doesn't forbid it.
> 
> Well, then we have to handle it.

Yes, and the way we handle it is by checking the cd->media_present: if
it is true, we will not allow runtime suspend as shown in the RFC patch.
http://marc.info/?l=linux-scsi&m=135876099800714&w=2

Thanks,
Aaron

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