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SubjectRe: panic in dmar_remove_one_dev_info
On Mon Dec 16 19, Jerry Snitselaar wrote:
>HP is seeing a panic on gen9 dl360 and dl560 while testing these other
>changes we've been eorking on. I just took an initial look, but have
>to run to a dentist appointment so couldn't dig too deep. It looks
>like the device sets dev->archdata.iommu to DEFER_DEVICE_DOMAIN_INFO
>in intel_iommu_add_device, and then it needs a private domain so
>dmar_remove_one_dev_info gets called. That code path ends up trying to
>use DEFER_DEVICE_DOMAIN_INFO as a pointer. I don't need if there just
>needs to be a check in there to bail out if it sees
>DEFER_DEVICE_DOMAIN_INFO, or if something more is needed. I'll look
>at it some more when I get back home.

Hi Baolu,

Does this look sane?

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5163,7 +5163,8 @@ static void dmar_remove_one_dev_info(struct device *dev)

spin_lock_irqsave(&device_domain_lock, flags);
info = dev->archdata.iommu;
- if (info)
+ if (info && info != DEFER_DEVICE_DOMAIN_INFO
spin_unlock_irqrestore(&device_domain_lock, flags);


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