Re: Flaw in the driver-model implementation of attributes

Date: Mon Jun 16 2003 - 13:03:44 EST

On Mon, Jun 16, 2003 at 01:54:34PM -0400, Alan Stern wrote:

> > IMO, if you don't own the object (and therefore don't know its lifetime),
> > you shouldn't be adding sysfs or device model attributes of any kind to
> > that object.
> That's not practical. How else can a device driver provide
> device-specific configuration options or information in sysfs? In many
> cases the device is owned by the bus, not the device driver.

Practical or not, when you put sysfs object into a structure, you take
full responsibility for the lifetime of that structure. Period.

Note that problems exist even when kernel is non-modular. Even if code
stays in place, the data getting freed under you is just as bad. And
that can trivially happen without any modules.
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