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>
/* 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;
};
{
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;
}
/****************************************************************************