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During S3 process, the dev in the function pci_xhci_device_doorbell may be set to NULL when disconnection is detected by DM. This patch is used to remove this risk. Tracked-On: #1893 Signed-off-by: Xiaoguang Wu <xiaoguang.wu@intel.com> Reviewed-by: Liang Yang <liang3.yang@intel.com> Acked-by: Yu Wang <yu1.wang@intel.com>
ACRN Device Model ################# Introduction ============ The ACRN Device Model provides **device sharing** capabilities between the Service OS and Guest OSs. It is a component that is used in conjunction with the `ACRN Hypervisor`_ and this is installed within the Service OS. You can find out more about Project ACRN on the `Project ACRN documentation`_ website. .. _`ACRN Hypervisor`: https://github.com/projectacrn/acrn-hypervisor .. _`Project ACRN documentation`: https://projectacrn.github.io/