Re: [RFC 1/1] Driver Core: don't oops with unregistered driver indriver_find_device()

From: Greg Kroah-Hartman
Date: Thu May 10 2012 - 10:11:32 EST

On Thu, May 10, 2012 at 10:35:02AM +0300, Hiroshi DOYU wrote:
> driver_find_device() can be called with an unregistered driver.

Who does that? Where in the kernel? Why would you try to do that?

> Need to check driver_private to see if it's populated or not,
> especially under deferrable probe.

Hm, I don't know if this will really catch a driver that was registered
and then was unregistered, right? It seems like moving the real problem
somewhere else, why not fix the original issue instead?

> Signed-off-by: Hiroshi DOYU <hdoyu@xxxxxxxxxx>
> ---
> In [PATCHv5 2/3] ARM: tegra: Add SMMU enabler in AHB:
> "tegra_ahb_driver" may not be populated when it's called.

It can? I don't see that in that patch.


greg k-h
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