PCI: vmd: Correct PCI Header Type Register's multi-function check

vmd_domain_reset() attempts to find whether the device may contain multiple
functions by checking 0x80 (Multi-Function Device), however, the hdr_type
variable has already been masked with PCI_HEADER_TYPE_MASK so the check can
never true.

To fix the issue, don't mask the read with PCI_HEADER_TYPE_MASK.

Fixes: 6aab562 ("PCI: vmd: Clean up domain before enumeration")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Cc: Nirmal Patel <[email protected]>

Author: ij-intel

drivers/pci/controller/vmd.c

@@ -525,8 +525,7 @@ static void vmd_domain_reset(struct vmd_dev *vmd)
 			base = vmd->cfgbar + PCIE_ECAM_OFFSET(bus,
 						PCI_DEVFN(dev, 0), 0);
 
-			hdr_type = readb(base + PCI_HEADER_TYPE) &
-					 PCI_HEADER_TYPE_MASK;
+			hdr_type = readb(base + PCI_HEADER_TYPE);
 
 			functions = (hdr_type & 0x80) ? 8 : 1;
 			for (fn = 0; fn < functions; fn++) {