Hi Andy,
On Wed, Feb 15, 2017 at 04:42:21PM +0200, Andy Shevchenko wrote:
> By default CONFIG_INTEL_IOMMU_DEFAULT_ON is not set and thus
> dmar_disabled variable is set.
>
> Intel IOMMU driver based on above doesn't set intel_iommu_enabled
> variable.
>
> The commit b0119e870837 ("iommu: Introduce new 'struct iommu_device'")
> mistakenly assumes it never happens and tries to unregister not ever
> registered resources, which crashes the kernel at boot time:
>
> BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000008
> IP: iommu_device_unregister+0x31/0x60
>
> Make unregister procedure conditional in free_iommu().
>
> Fixes: b0119e870837 ("iommu: Introduce new 'struct iommu_device'")
> Cc: Joerg Roedel <jroe...@suse.de>
> Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
Thanks for the patch, I applied it and will send it upstream asap.
Joerg
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