Re: [ALSA STABLE 3/3] a few more -- unregister platform device again if probe was unsuccessful

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Thu, Apr 13, 2006 at 04:05:33PM +0200, Rene Herman wrote:
> Not honouring/passing up probe() method error returns, not even -ENODEV, 
> makes some sense for discoverable busses such as PCI where you at least 
> have a driver independent bus_id sitting in /sys/devices/pci* that you 
> can later echo into /sys/bus/pci/drivers/*/bind to make the driver bind 
> to a device, but not much sense for the platform bus. Platform devices 
> only "exist" (in /sys/devices/platform) due to the driver creating them 
> itself and keeping them after failing a probe means that directory 
> becomes an enumeration of the drivers we loaded, rather than a view of 
> what's present in the system.

Incorrect.  In some circumstances, they may be created by architecture
support code, and might be created and destroyed dynamically by
architecture support code.

> The driver model crowd did not seem exceedingly interested in the 
> problem though:
> 
> http://marc.theaimsgroup.com/?l=linux-kernel&m=114417829014332&w=2

Incorrect summary.  The ALSA use model of the driver model doesn't fit
with the driver model use model.  It's not that we're not interested
in it - it's that it's perverted to the way driver model folk intend
the subsystem to work, and the way that platform devices are used on
some architectures.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core