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    SubjectRe: [PATCH v4 0/2] [SCSI] Asynchronous event notification infrastructure
    On Mon, 2007-10-29 at 10:42 -0400, Jeff Garzik wrote:
    > This is the next revision of the SCSI event notification infrastructure
    > patchset, enabling SATA Asynchronous Notification ("AN") for CD/DVD
    > devices that support it.
    > For devices that support SATA AN (only very recent ones do), this means
    > that HAL and other userspace utilities no longer need to repeatedly poll
    > the CD/DVD device to determine if the user has changed the media.
    > This revision takes into account James' comments from earlier today,
    > modulo the following notes:
    > * I think the various event attributes should always be present,
    > for all devices at all times. If various events are not supported,
    > the attribute will of course return zero (false, not supported).

    Actually, I don't think so. We have precedent for this in the transport
    classes: if a device doesn't support a feature, we don't export the flag
    for that feature through sysfs. This allows not only feature control,
    but an immediate view of the device capabilities simply by viewing the
    sysfs directory.

    I think this functionality is very easy to layer in, so there's no
    reason not to do it.

    > * I do not think this work should be blocked behind a revamp
    > of the attribute group interface.

    Assuming gregkh or kay ack, it won't be.

    > * I was slack and did not bother to implement the 'set' operation
    > for the attributes. This can easily be done at a later time in a
    > separate patch. It is not a merge stopper to have the driver
    > exclusively control the event mask, rather than driver+sysfs.


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      Last update: 2007-10-29 17:45    [W:0.022 / U:4.556 seconds]
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