mbox series

[v4,0/5] bus: Make remove callback return void

Message ID 20210713193522.1770306-1-u.kleine-koenig@pengutronix.de
Headers show
Series bus: Make remove callback return void | expand

Message

Uwe Kleine-König July 13, 2021, 7:35 p.m. UTC
Hello,

this is v4 of the final patch set for my effort to make struct
bus_type::remove return void.

The first four patches contain cleanups that make some of these
callbacks (more obviously) always return 0. They are acked by the
respective maintainers. Bjorn Helgaas explicitly asked to include the
pci patch (#1) into this series, so Greg taking this is fine. I assume
the s390 people are fine with Greg taking patches #2 to #4, too, they
didn't explicitly said so though.

The last patch actually changes the prototype and so touches quite some
drivers and has the potential to conflict with future developments, so I
consider it beneficial to put these patches into next soon. I expect
that it will be Greg who takes the complete series, he already confirmed
via irc (for v2) to look into this series.

The only change compared to v3 is in the fourth patch where I modified a
few more drivers to fix build failures. Some of them were found by build
bots (thanks!), some of them I found myself using a regular expression
search. The newly modified files are:

 arch/sparc/kernel/vio.c
 drivers/nubus/bus.c
 drivers/sh/superhyway/superhyway.c
 drivers/vlynq/vlynq.c
 drivers/zorro/zorro-driver.c
 sound/ac97/bus.c

Best regards
Uwe

Uwe Kleine-König (5):
  PCI: endpoint: Make struct pci_epf_driver::remove return void
  s390/cio: Make struct css_driver::remove return void
  s390/ccwgroup: Drop if with an always false condition
  s390/scm: Make struct scm_driver::remove return void
  bus: Make remove callback return void

 arch/arm/common/locomo.c                  | 3 +--
 arch/arm/common/sa1111.c                  | 4 +---
 arch/arm/mach-rpc/ecard.c                 | 4 +---
 arch/mips/sgi-ip22/ip22-gio.c             | 3 +--
 arch/parisc/kernel/drivers.c              | 5 ++---
 arch/powerpc/platforms/ps3/system-bus.c   | 3 +--
 arch/powerpc/platforms/pseries/ibmebus.c  | 3 +--
 arch/powerpc/platforms/pseries/vio.c      | 3 +--
 arch/s390/include/asm/eadm.h              | 2 +-
 arch/sparc/kernel/vio.c                   | 4 +---
 drivers/acpi/bus.c                        | 3 +--
 drivers/amba/bus.c                        | 4 +---
 drivers/base/auxiliary.c                  | 4 +---
 drivers/base/isa.c                        | 4 +---
 drivers/base/platform.c                   | 4 +---
 drivers/bcma/main.c                       | 6 ++----
 drivers/bus/sunxi-rsb.c                   | 4 +---
 drivers/cxl/core.c                        | 3 +--
 drivers/dax/bus.c                         | 4 +---
 drivers/dma/idxd/sysfs.c                  | 4 +---
 drivers/firewire/core-device.c            | 4 +---
 drivers/firmware/arm_scmi/bus.c           | 4 +---
 drivers/firmware/google/coreboot_table.c  | 4 +---
 drivers/fpga/dfl.c                        | 4 +---
 drivers/hid/hid-core.c                    | 4 +---
 drivers/hid/intel-ish-hid/ishtp/bus.c     | 4 +---
 drivers/hv/vmbus_drv.c                    | 5 +----
 drivers/hwtracing/intel_th/core.c         | 4 +---
 drivers/i2c/i2c-core-base.c               | 5 +----
 drivers/i3c/master.c                      | 4 +---
 drivers/input/gameport/gameport.c         | 3 +--
 drivers/input/serio/serio.c               | 3 +--
 drivers/ipack/ipack.c                     | 4 +---
 drivers/macintosh/macio_asic.c            | 4 +---
 drivers/mcb/mcb-core.c                    | 4 +---
 drivers/media/pci/bt8xx/bttv-gpio.c       | 3 +--
 drivers/memstick/core/memstick.c          | 3 +--
 drivers/mfd/mcp-core.c                    | 3 +--
 drivers/misc/mei/bus.c                    | 4 +---
 drivers/misc/tifm_core.c                  | 3 +--
 drivers/mmc/core/bus.c                    | 4 +---
 drivers/mmc/core/sdio_bus.c               | 4 +---
 drivers/net/netdevsim/bus.c               | 3 +--
 drivers/ntb/core.c                        | 4 +---
 drivers/ntb/ntb_transport.c               | 4 +---
 drivers/nubus/bus.c                       | 6 ++----
 drivers/nvdimm/bus.c                      | 3 +--
 drivers/pci/endpoint/pci-epf-core.c       | 7 ++-----
 drivers/pci/pci-driver.c                  | 3 +--
 drivers/pcmcia/ds.c                       | 4 +---
 drivers/platform/surface/aggregator/bus.c | 4 +---
 drivers/platform/x86/wmi.c                | 4 +---
 drivers/pnp/driver.c                      | 3 +--
 drivers/rapidio/rio-driver.c              | 4 +---
 drivers/rpmsg/rpmsg_core.c                | 7 ++-----
 drivers/s390/block/scm_drv.c              | 4 +---
 drivers/s390/cio/ccwgroup.c               | 6 +-----
 drivers/s390/cio/chsc_sch.c               | 3 +--
 drivers/s390/cio/css.c                    | 7 +++----
 drivers/s390/cio/css.h                    | 2 +-
 drivers/s390/cio/device.c                 | 9 +++------
 drivers/s390/cio/eadm_sch.c               | 4 +---
 drivers/s390/cio/scm.c                    | 5 +++--
 drivers/s390/cio/vfio_ccw_drv.c           | 3 +--
 drivers/s390/crypto/ap_bus.c              | 4 +---
 drivers/scsi/scsi_debug.c                 | 3 +--
 drivers/sh/superhyway/superhyway.c        | 8 ++------
 drivers/siox/siox-core.c                  | 4 +---
 drivers/slimbus/core.c                    | 4 +---
 drivers/soc/qcom/apr.c                    | 4 +---
 drivers/spi/spi.c                         | 4 +---
 drivers/spmi/spmi.c                       | 3 +--
 drivers/ssb/main.c                        | 4 +---
 drivers/staging/fieldbus/anybuss/host.c   | 4 +---
 drivers/staging/greybus/gbphy.c           | 4 +---
 drivers/target/loopback/tcm_loop.c        | 5 ++---
 drivers/thunderbolt/domain.c              | 4 +---
 drivers/tty/serdev/core.c                 | 4 +---
 drivers/usb/common/ulpi.c                 | 4 +---
 drivers/usb/serial/bus.c                  | 4 +---
 drivers/usb/typec/bus.c                   | 4 +---
 drivers/vdpa/vdpa.c                       | 4 +---
 drivers/vfio/mdev/mdev_driver.c           | 4 +---
 drivers/virtio/virtio.c                   | 3 +--
 drivers/vlynq/vlynq.c                     | 4 +---
 drivers/vme/vme.c                         | 4 +---
 drivers/xen/xenbus/xenbus.h               | 2 +-
 drivers/xen/xenbus/xenbus_probe.c         | 4 +---
 drivers/zorro/zorro-driver.c              | 3 +--
 include/linux/device/bus.h                | 2 +-
 include/linux/pci-epf.h                   | 2 +-
 sound/ac97/bus.c                          | 6 ++----
 sound/aoa/soundbus/core.c                 | 4 +---
 93 files changed, 107 insertions(+), 263 deletions(-)


base-commit: e73f0f0ee7541171d89f2e2491130c7771ba58d3

Comments

Geert Uytterhoeven July 14, 2021, 8:44 a.m. UTC | #1
On Tue, Jul 13, 2021 at 9:35 PM Uwe Kleine-König
<u.kleine-koenig@pengutronix.de> wrote:
> The driver core ignores the return value of this callback because there
> is only little it can do when a device disappears.
>
> This is the final bit of a long lasting cleanup quest where several
> buses were converted to also return void from their remove callback.
> Additionally some resource leaks were fixed that were caused by drivers
> returning an error code in the expectation that the driver won't go
> away.
>
> With struct bus_type::remove returning void it's prevented that newly
> implemented buses return an ignored error code and so don't anticipate
> wrong expectations for driver authors.

>  drivers/zorro/zorro-driver.c              | 3 +--

Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

Gr{oetje,eeting}s,

                        Geert
Greg KH July 21, 2021, 10:09 a.m. UTC | #2
On Tue, Jul 13, 2021 at 09:35:17PM +0200, Uwe Kleine-König wrote:
> Hello,
> 
> this is v4 of the final patch set for my effort to make struct
> bus_type::remove return void.
> 
> The first four patches contain cleanups that make some of these
> callbacks (more obviously) always return 0. They are acked by the
> respective maintainers. Bjorn Helgaas explicitly asked to include the
> pci patch (#1) into this series, so Greg taking this is fine. I assume
> the s390 people are fine with Greg taking patches #2 to #4, too, they
> didn't explicitly said so though.
> 
> The last patch actually changes the prototype and so touches quite some
> drivers and has the potential to conflict with future developments, so I
> consider it beneficial to put these patches into next soon. I expect
> that it will be Greg who takes the complete series, he already confirmed
> via irc (for v2) to look into this series.
> 
> The only change compared to v3 is in the fourth patch where I modified a
> few more drivers to fix build failures. Some of them were found by build
> bots (thanks!), some of them I found myself using a regular expression
> search. The newly modified files are:
> 
>  arch/sparc/kernel/vio.c
>  drivers/nubus/bus.c
>  drivers/sh/superhyway/superhyway.c
>  drivers/vlynq/vlynq.c
>  drivers/zorro/zorro-driver.c
>  sound/ac97/bus.c
> 
> Best regards
> Uwe

Now queued up.  I can go make a git tag that people can pull from after
0-day is finished testing this to verify all is good, if others need it.

thanks,

greg k-h