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    SubjectRe: [PATCH] firewire: reread config ROM when device reset the bus
    I wrote:
    >> On Mon, Mar 3, 2008 at 11:51 AM, Stefan Richter
    >> <> wrote:
    [...rewriting data of a device with children devices whose driver probe
    accesses these data...]
    >>> Maybe I should rather use fw-device.c::idr_rwsem instead of device.sem,
    >>> to have better control over who takes the mutex when. Could also be a
    >>> new dedicated mutex but we don't want to end up with too many of
    >>> them...
    > Ah, wait, there is a 3rd reader: sbp2_probe's sbp2_scan_unit_dir. So,
    > using dev->sem is actually the nicest way for now.

    Or not. The necessary protection for this and other driver->probe()s
    would be the device->parent.sem, not the device->sem itself. There seem
    to be several ways how a driver probe may be entered (adding a device
    when the driver is already there; attaching a driver when the device is
    already there...) and I am not sure whether all these paths take the
    device->parent.sem around the probe. It doesn't seem to be always the case.

    Greg, can you comment on this?
    Stefan Richter
    -=====-==--- --== ---==

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      Last update: 2008-03-03 19:37    [W:0.050 / U:102.424 seconds]
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