From: Aaron Lu <aaron.lu@intel.com>
To: Oliver Neukum <oneukum@suse.de>
Cc: Julian Calaby <julian.calaby@gmail.com>,
Alan Stern <stern@rowland.harvard.edu>,
James Bottomley <James.Bottomley@hansenpartnership.com>,
Jeff Garzik <jgarzik@pobox.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>, Tejun Heo <tj@kernel.org>,
Aaron Lu <aaron.lwe@gmail.com>, Jeff Wu <jeff.wu@amd.com>,
linux-ide@vger.kernel.org, linux-pm@vger.kernel.org,
linux-scsi@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: Re: [PATCH v13 1/9] scsi: sr: support runtime pm
Date: Tue, 22 Jan 2013 17:20:27 +0800 [thread overview]
Message-ID: <50FE59DB.20508@intel.com> (raw)
In-Reply-To: <10228102.NgVGz9qsxX@linux-5eaq.site>
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
next prev parent reply other threads:[~2013-01-22 9:20 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-15 9:20 [PATCH v13 0/9] ZPODD Patches Aaron Lu
2013-01-15 9:20 ` [PATCH v13 1/9] scsi: sr: support runtime pm Aaron Lu
2013-01-16 15:45 ` James Bottomley
2013-01-16 16:31 ` Alan Stern
2013-01-18 7:42 ` Aaron Lu
2013-01-18 15:24 ` Alan Stern
2013-01-19 8:55 ` Aaron Lu
2013-01-19 18:46 ` Alan Stern
2013-01-21 3:31 ` Julian Calaby
2013-01-21 8:14 ` Aaron Lu
2013-01-21 8:55 ` Julian Calaby
2013-01-21 9:11 ` Aaron Lu
2013-01-21 14:56 ` Oliver Neukum
2013-01-22 2:25 ` Aaron Lu
2013-01-22 9:13 ` Oliver Neukum
2013-01-22 9:20 ` Aaron Lu [this message]
2013-01-21 8:04 ` Aaron Lu
2013-01-21 9:37 ` [RFC PATCH] " Aaron Lu
2013-01-21 16:59 ` Alan Stern
2013-01-22 2:27 ` Aaron Lu
2013-01-21 13:36 ` [PATCH v13 1/9] " Aaron Lu
2013-01-15 9:20 ` [PATCH v13 2/9] libata: identify and init ZPODD devices Aaron Lu
2013-01-21 9:16 ` Jeff Garzik
2013-01-21 9:28 ` Aaron Lu
2013-01-15 9:20 ` [PATCH v13 3/9] libata: move acpi notification code to zpodd Aaron Lu
2013-01-15 9:21 ` [PATCH v13 4/9] libata: check zero power ready status for ZPODD Aaron Lu
2013-01-15 9:21 ` [PATCH v13 5/9] libata: handle power transition of ODD Aaron Lu
2013-01-15 9:21 ` [PATCH v13 6/9] libata: expose pm qos flags for ata device Aaron Lu
2013-01-15 9:21 ` [PATCH v13 7/9] libata: scsi: no poll when ODD is powered off Aaron Lu
2013-01-15 9:21 ` [PATCH v13 8/9] libata: do not suspend port if normal ODD is attached Aaron Lu
2013-01-21 20:42 ` Jeff Garzik
2013-01-22 11:27 ` Aaron Lu
2013-01-15 9:21 ` [PATCH v13 9/9] scsi: remove can_power_off flag from scsi_device Aaron Lu
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