On Wednesday 20 March 2013, Fabio Porcedda wrote:
>
> On Wed, Mar 20, 2013 at 11:20 AM, Arnd Bergmann <a...@arndb.de> wrote:
> > On Wednesday 20 March 2013, Fabio Porcedda wrote:
> >> I think we can check inside the deferred_probe_work_func()
> >> if the dev->probe function pointer is equal to platform_drv_probe_fail().
> >
> > I think it's too late by then, because that would only warn if we try to
> > probe
> > it again, but when platform_driver_probe() does not succeed immediately, it
>
> Maybe you mean "does succeed immediately" ?
I mean in this code (simplified for the sake of discussion)
int __init_or_module platform_driver_probe(struct platform_driver *drv,
int (*probe)(struct platform_device *))
{
int retval, code;
drv->probe = probe;
retval = code = platform_driver_register(drv);
drv->probe = NULL;
if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
retval = -ENODEV;
drv->driver.probe = platform_drv_probe_fail;
if (code != retval)
platform_driver_unregister(drv);
return retval;
}
we assume that all devices are bound to drivers during the call to
platform_driver_register, and if the device list is empty afterwards,
we unregister the driver and will never get to the deferred probing
stage.
Arnd
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