kernel-device: use device sysfs if physdev sysfs isn't available

find_device_by_physdev_uid() expects a non-NULL UID of the physical
device. However, mm_kernel_device_get_physdev_uid() could potentially
return NULL on MMKernelDeviceUdev if find_physical_gudevdevice() in
mm-kernel-device-udev.c fails to find the physical device. When a NULL
physical device UID is passed to find_device_by_physdev_uid() and used
in g_hash_table_lookup(), it leads to a crash in g_str_hash(), which is
a bit obscure.

This patch updates kernel_device_get_physdev_uid() in
mm-kernel-device-udev.c to fall back to use the device sysfs if the
physical device sysfs isn't available, which is similar to how
kernel_device_get_physdev_uid() mm-kernel-device-generic.c is
implemented.

0 files changed, 0 insertions, 0 deletions