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x86/amd-iommu: Panic if IOMMU command buffer reset fails

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To prevent the driver from doing recursive command buffer
resets, just panic when that recursion happens.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-09-03 15:08:09 +02:00
parent a345b23b79
commit b26e81b871
2 changed files with 10 additions and 0 deletions
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3
arch/x86/include/asm/amd_iommu_types.h
View file

@ -337,6 +337,9 @@ struct amd_iommu {
/* if one, we need to send a completion wait command */
bool need_sync;
/* becomes true if a command buffer reset is running */
bool reset_in_progress;
/* default dma_ops domain for that IOMMU */
struct dma_ops_domain *default_dom;
};

7
arch/x86/kernel/amd_iommu.c
View file

@ -553,9 +553,16 @@ static void reset_iommu_command_buffer(struct amd_iommu *iommu)
{
pr_err("AMD-Vi: Resetting IOMMU command buffer\n");
if (iommu->reset_in_progress)
panic("AMD-Vi: ILLEGAL_COMMAND_ERROR while resetting command buffer\n");
iommu->reset_in_progress = true;
amd_iommu_reset_cmd_buffer(iommu);
flush_all_devices_for_iommu(iommu);
flush_all_domains_on_iommu(iommu);
iommu->reset_in_progress = false;
}
/****************************************************************************