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Re: ordering calls to driver's ::start() routine?

Hi Andrew,

Does the unit number have to be a zero-based consecutive number? Would 12 and 14 be acceptable unit numbers? You might also wish to consider using the path to your device object instead to distinguish one from the next. It's meant to be unique and persistent, and it's a little more tangible, if it fits your goals.

Dan

On Monday, February 4, 2002, at 04:56 PM, Andrew Gallatin wrote:

Francis Bouchard writes:
I'm not a guru, but in your probe you could get the PCI slot number or some
information from the PCI bus telling you the position of your card. From
there you could set-up your driver properly.

Am I misunderstanding what you want to do ?

No, but that requires me sorting a list and doing some other things
that are moderately tricky.

I figure the whole point of the IOKit interface was to reduce
duplicated code & protect driver authors from themselves, so I was
hoping for an "easy" way to do it. Like "put the following magic in
Info.plist" or something along those lines ;)

If there isn't, then I'll write the code..

Thanks,

Drew


Regards
Francis

On 04/02/2002 16:29, "Andrew Gallatin" <email@hidden> wrote:

I'm working on an IOKit driver for a PCI device. I'm matching on
device id / vendor id in info.plist.

All was well until I added a second card to the machine (dual g4).
When I did this, I noticed that my start() routine was being called in
parallel. This is bad because all units share some common data. To
fix this, I "locked" the start routine.

However, I'm now having a problem where the start() routine is
called in a somewhat random order. By this I mean that most times
<device>@12 makes it into the start() routine first, but sometimes
<device>@14 wins the race. This is a problem because the first
device through my start() routine ends up as unit 0, the second as
unit 1, etc. I'd really like to keep these unit numbers
consistant across reboots.

Is there an easy way to make this deterministic?

Thanks in advance for your suggestions,

Drew
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References: 
 >Re: ordering calls to driver's ::start() routine? (From: Andrew Gallatin <email@hidden>)



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