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Commit ea90228c authored by Raul E Rangel's avatar Raul E Rangel Committed by Joerg Roedel
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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: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarRaul E Rangel <rrangel@chromium.org>
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20200511103229.v2.1.I6f1b6f973ee6c8af1348611370c73a0ec0ea53f1@changeid


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent e461b8c9
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