[PATCH 00/18] Annotate switch/case fallthrough cases

[Andre Przywara <andre.przywara@arm.com>]

C's implicit fallthrough behaviour in switch/case statements can lead to
subtle bugs. Quite some while ago many compilers introduced warnings in
those cases, requiring intentional fallthrough's to be annotated.
    
So far we were not enabling that compiler option, so many ambiguities
and some bugs in the code went unnoticed.

This series adds the required annotations in code paths that the first
stage of the U-Boot CI covers. There is a large number of cases left
in the libbz2 code. The usage of switch/case is borderline insane there,
labels are hidden in macros, and there are no breaks, but just goto's.
Upstream still uses very similar code, without any annotations. I still
am not 100% sure those are meant to fall through or not, and plan to do
further investigations, but didn't want to hold the rest of the patches
back. You can see for yourself by applying patch 18/18 and building for
sandbox64, for instance.

Because of this we cannot quite enable the warning in the Makefile yet,
but those fixes are worth regardless, and be it to increase readability.

Please not that those patches do not fix anything, really, they just add
those fallthrough annotations, so the series is not really critical.

Cheers,
Andre

Andre Przywara (18):
  spl: mmc: properly annotate fallthrough
  zlib: annotate switch/case fallthrough cases
  gadget: f_thor: annotate switch/case fallthrough
  use proper fallthrough annotations
  net/net: fix switch/case fallthrough annotations
  fastboot: annotate switch/case fallthrough case
  net: sun8i-emac: annotate fallthrough
  usb: ohci-hcd: annotate switch/case fallthrough
  usb: xhci: annotate switch/case fallthrough properly (TBF)
  video: annotate switch/case fall-through
  net: e1000: annotate switch/case fallthrough
  mtd: ubi: annotate fallthrough (TBF)
  arm: mach-k3: am62p: annotate switch/case fallthrough
  mtd: spi-nor-tiny: annotate switch/case fallthrough
  mtd: rawnand: nand_base: annotate switch/case fallthrough
  cmd: pmic: annotate switch/case fallthrough
  cmd: spl: annotate switch/case fallthrough
  [DO NOT MERGE] Makefile: enable switch/case fallthrough warnings

 Makefile                              |  1 +
 arch/arm/mach-k3/am62px/am62p5_init.c |  1 +
 cmd/pmic.c                            |  1 +
 cmd/spl.c                             |  2 ++
 common/command.c                      |  2 +-
 common/spl/spl_mmc.c                  |  1 +
 drivers/fastboot/fb_command.c         |  1 +
 drivers/mtd/nand/raw/nand_base.c      |  4 ++++
 drivers/mtd/spi/spi-nor-tiny.c        |  1 +
 drivers/mtd/ubi/attach.c              |  1 +
 drivers/mtd/ubi/build.c               |  3 +++
 drivers/net/e1000.c                   |  2 ++
 drivers/net/sun8i_emac.c              |  1 +
 drivers/usb/gadget/f_thor.c           |  1 +
 drivers/usb/host/ohci-hcd.c           |  3 ++-
 drivers/usb/host/xhci.c               |  2 +-
 drivers/video/video-uclass.c          |  2 ++
 lib/tiny-printf.c                     |  2 +-
 lib/zlib/inflate.c                    | 21 +++++++++++++++++++++
 net/net.c                             |  5 ++---
 20 files changed, 50 insertions(+), 7 deletions(-)

-- 
2.25.1