Comment 3 for bug 1870320

I was able to apply the patches, but only in the order:
1) apply 0001-s390-pci-Recover-handle-in-clp_set_pci_fn.patch (based on 17cdec960cf7)
2) cherry-pick 576c75e36c68

However, the test compile (on focal, but that shouldn't matter) failed:

make[2]: Leaving directory '/home/ubuntu/bionic-lp1870320/debian/build/build-generic'
make[1]: *** [Makefile:146: sub-make] Error 2
make[1]: Leaving directory '/home/ubuntu/bionic-lp1870320'
make: *** [debian/rules.d/2-binary-arch.mk:50: /home/ubuntu/bionic-lp1870320/debian/stamps/stamp-build-generic] Error 2
ubuntu@s1lp15:~/bionic-lp1870320$

due to:

...
  CC [M] fs/afs/inode.o
/home/ubuntu/bionic-lp1870320/arch/s390/pci/pci_clp.c: In function ‘clp_disable_fh’:
/home/ubuntu/bionic-lp1870320/arch/s390/pci/pci_clp.c:295:6: warning: unused variable ‘fh’ [-Wunused-variable]
  295 | u32 fh = zdev->fh;
      | ^~
  CC crypto/lzo.o
  CC security/keys/request_key.o
  CC arch/s390/pci/pci_sysfs.o
  CC security/smack/smack_lsm.o
  CC kernel/power/wakelock.o
  CC [M] fs/afs/main.o
  CC security/selinux/hooks.o
/home/ubuntu/bionic-lp1870320/arch/s390/pci/pci_sysfs.c: In function ‘recover_store’:
/home/ubuntu/bionic-lp1870320/arch/s390/pci/pci_sysfs.c:73:6: error: implicit declaration of function ‘pci_dev_is_added’; did you mean ‘pci_device_add’? [-Werror=implicit-function-declaration]
   73 | if (pci_dev_is_added(pdev)) {
      | ^~~~~~~~~~~~~~~~
      | pci_device_add
  CC crypto/rng.o
cc1: some warnings being treated as errors
...