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LocatePciExpressCapabilityRegBlock () doesn't check the return status of Pci.Read(). Certain platform's PciRootBridge.Pci.Read() doesn't support PCIE access causing the CapabilityEntry not updated. If the uninitialized CapabilityEntry equals to a big enough initial value, the while-loop will never end. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com> Reviewed-by: Maurice Ma <maurice.ma@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17513 6f19259b-4bc3-4df7-8a09-765794883524