filter out PCI Bus directories

Signed-off-by: Niclas Schad <niclas.schad@stackit.cloud>

Author: nschad

pkg/csi/util/mount/mount.go

@@ -21,6 +21,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"regexp"
 	"slices"
 	"strings"
 	"time"
@@ -42,6 +43,10 @@ const (
 	operationFinishSteps     = 15
 )
 
+var (
+	pciAddressRegex = regexp.MustCompile(`^[0-9a-fA-F]{4}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}\.[0-9a-fA-F]$`)
+)
+
 type IMount interface {
 	Mounter() *mount.SafeFormatAndMount
 	ScanForAttach(devicePath string) error
@@ -159,8 +164,9 @@ func GetEmptyPCIeRootPorts() (int64, error) {
 				klog.Errorf("failed to read dir %s : %v", devPath, err2)
 			}
 			for _, file := range files {
-				// PCI addresses always contain a colon
-				if strings.Contains(file.Name(), ":") {
+				// Ignore PCI bus directories such as pci001 pci002 and pci010
+				// Devices must follow <domain:bus:device.function> format
+				if pciAddressRegex.MatchString(file.Name()) {
 					hasChild = true
 					break
 				}