Messages in this thread | | | Date | Tue, 11 Mar 2003 09:06:54 -0600 (CST) | From | Patrick Mochel <> | Subject | Re: PCI driver module unload race? |
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> > > I think it's not easy. I haven't studied the code completely yet, but > > > e.g. when you attach a device to a driver you also have to get a > > > reference to the driver. > > > > You get a link to the driver, but you can't increment the module count > > of the driver at that time, as we have to be able to remove a module > > somehow :) > > That is simple. Export a generic way to disconnect a driver from a device.
It's not that easy - Linux has always supported the operation of being able to remove a module while it is attached to devices. The reference count only goes up if a device is opened.
This means the module refcount must remain at 0, even after it's bound to devices. Changing this would require a change in visible behavior, and require an extra step by a user to disconnect the driver before they unload the module.
-pat
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