9b45a7738e
The polling loop for the register change in iommu_ga_log_enable() needs
to have a udelay() in it. Otherwise the CPU might be faster than the
IOMMU hardware and wrongly trigger the WARN_ON() further down the code
stream. Use a 10us for udelay(), has there is some hardware where
activation of the GA log can take more than a 100ms.
A future optimization should move the activation check of the GA log
to the point where it gets used for the first time. But that is a
bigger change and not suitable for a fix.
Fixes:
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||
|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| amd_iommu.h | ||
| amd_iommu_types.h | ||
| debugfs.c | ||
| init.c | ||
| io_pgtable.c | ||
| iommu.c | ||
| iommu_v2.c | ||
| quirks.c | ||