iommu/amd: Fix get_acpihid_device_id()
acpi_dev_hid_uid_match() expects a null pointer for UID if it doesn't exist. The acpihid_map_entry contains a char buffer for holding the UID. If no UID was provided in the IVRS table, this buffer will be zeroed. If we pass in a null string, acpi_dev_hid_uid_match() will return false because it will try and match an empty string to the ACPI UID of the device. Fixes: ae5e6c64 ("iommu/amd: Switch to use acpi_dev_hid_uid_match()") Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Raul E Rangel <rrangel@chromium.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200511103229.v2.1.I6f1b6f973ee6c8af1348611370c73a0ec0ea53f1@changeid Signed-off-by: Joerg Roedel <jroedel@suse.de>
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