On Mon, May 11, 2020 at 10:33:36AM -0600, Raul E Rangel wrote: > 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: ae5e6c6439c3 ("iommu/amd: Switch to use acpi_dev_hid_uid_match()") > Suggested-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> > Signed-off-by: Raul E Rangel <rrangel@xxxxxxxxxxxx> > Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> > --- > > Changes in v2: > - Added Suggested by > - Fixed commit description > - Decided to keep `p->uid[0]` instead of `*p->uid` since the data member is an array instead of a pointer. > - Used clang-format > > drivers/iommu/amd_iommu.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) Applied for v5.7, thanks Raul.