bus: Make remove callback return void

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.

Reviewed-by: Tom Rix <trix@redhat.com> (For fpga)
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Cornelia Huck <cohuck@redhat.com> (For drivers/s390 and drivers/vfio)
Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> (For ARM, Amba and related parts)
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Chen-Yu Tsai <wens@csie.org> (for sunxi-rsb)
Acked-by: Pali Rohár <pali@kernel.org>
Acked-by: Mauro Carvalho Chehab <mchehab@kernel.org> (for media)
Acked-by: Hans de Goede <hdegoede@redhat.com> (For drivers/platform)
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-By: Vinod Koul <vkoul@kernel.org>
Acked-by: Juergen Gross <jgross@suse.com> (For xen)
Acked-by: Lee Jones <lee.jones@linaro.org> (For mfd)
Acked-by: Johannes Thumshirn <jth@kernel.org> (For mcb)
Acked-by: Johan Hovold <johan@kernel.org>
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> (For slimbus)
Acked-by: Kirti Wankhede <kwankhede@nvidia.com> (For vfio)
Acked-by: Maximilian Luz <luzmaximilian@gmail.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> (For ulpi and typec)
Acked-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com> (For ipack)
Acked-by: Geoff Levand <geoff@infradead.org> (For ps3)
Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com> (For thunderbolt)
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> (For intel_th)
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net> (For pcmcia)
Acked-by: Rafael J. Wysocki <rafael@kernel.org> (For ACPI)
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> (rpmsg and apr)
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> (For intel-ish-hid)
Acked-by: Dan Williams <dan.j.williams@intel.com> (For CXL, DAX, and NVDIMM)
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> (For isa)
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (For firewire)
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> (For hid)
Acked-by: Thorsten Scherer <t.scherer@eckelmann.de> (For siox)
Acked-by: Sven Van Asbroeck <TheSven73@gmail.com> (For anybuss)
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> (For MMC)
Acked-by: Wolfram Sang <wsa@kernel.org> # for I2C
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Finn Thain <fthain@linux-m68k.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20210713193522.1770306-6-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

9 files changed, 10 insertions, 22 deletions

diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c
index e45f4e4e06b6..24d21ba63030 100644
--- a/arch/arm/common/locomo.c
+++ b/arch/arm/common/locomo.c
@@ -834,14 +834,13 @@ static int locomo_bus_probe(struct device *dev)
 	return ret;
 }
 
-static int locomo_bus_remove(struct device *dev)
+static void locomo_bus_remove(struct device *dev)
 {
 	struct locomo_dev *ldev = LOCOMO_DEV(dev);
 	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
 
 	if (drv->remove)
 		drv->remove(ldev);
-	return 0;
 }
 
 struct bus_type locomo_bus_type = {
diff --git a/arch/arm/common/sa1111.c b/arch/arm/common/sa1111.c
index ff5e0d04cb89..092a2ebc0c28 100644
--- a/arch/arm/common/sa1111.c
+++ b/arch/arm/common/sa1111.c
@@ -1364,15 +1364,13 @@ static int sa1111_bus_probe(struct device *dev)
 	return ret;
 }
 
-static int sa1111_bus_remove(struct device *dev)
+static void sa1111_bus_remove(struct device *dev)
 {
 	struct sa1111_dev *sadev = to_sa1111_device(dev);
 	struct sa1111_driver *drv = SA1111_DRV(dev->driver);
 
 	if (drv->remove)
 		drv->remove(sadev);
-
-	return 0;
 }
 
 struct bus_type sa1111_bus_type = {
diff --git a/arch/arm/mach-rpc/ecard.c b/arch/arm/mach-rpc/ecard.c
index 827b50f1c73e..53813f9464a2 100644
--- a/arch/arm/mach-rpc/ecard.c
+++ b/arch/arm/mach-rpc/ecard.c
@@ -1052,7 +1052,7 @@ static int ecard_drv_probe(struct device *dev)
 	return ret;
 }
 
-static int ecard_drv_remove(struct device *dev)
+static void ecard_drv_remove(struct device *dev)
 {
 	struct expansion_card *ec = ECARD_DEV(dev);
 	struct ecard_driver *drv = ECARD_DRV(dev->driver);
@@ -1067,8 +1067,6 @@ static int ecard_drv_remove(struct device *dev)
 	ec->ops = &ecard_default_ops;
 	barrier();
 	ec->irq_data = NULL;
-
-	return 0;
 }
 
 /*
diff --git a/arch/mips/sgi-ip22/ip22-gio.c b/arch/mips/sgi-ip22/ip22-gio.c
index de0768a49ee8..dfc52f661ad0 100644
--- a/arch/mips/sgi-ip22/ip22-gio.c
+++ b/arch/mips/sgi-ip22/ip22-gio.c
@@ -143,14 +143,13 @@ static int gio_device_probe(struct device *dev)
 	return error;
 }
 
-static int gio_device_remove(struct device *dev)
+static void gio_device_remove(struct device *dev)
 {
 	struct gio_device *gio_dev = to_gio_device(dev);
 	struct gio_driver *drv = to_gio_driver(dev->driver);
 
 	if (dev->driver && drv->remove)
 		drv->remove(gio_dev);
-	return 0;
 }
 
 static void gio_device_shutdown(struct device *dev)
diff --git a/arch/parisc/kernel/drivers.c b/arch/parisc/kernel/drivers.c
index 80fa0650736b..776d624a7207 100644
--- a/arch/parisc/kernel/drivers.c
+++ b/arch/parisc/kernel/drivers.c
@@ -133,14 +133,13 @@ static int parisc_driver_probe(struct device *dev)
 	return rc;
 }
 
-static int __exit parisc_driver_remove(struct device *dev)
+static void __exit parisc_driver_remove(struct device *dev)
 {
 	struct parisc_device *pa_dev = to_parisc_device(dev);
 	struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
+
 	if (pa_drv->remove)
 		pa_drv->remove(pa_dev);
-
-	return 0;
 }
 	
 
diff --git a/arch/powerpc/platforms/ps3/system-bus.c b/arch/powerpc/platforms/ps3/system-bus.c
index 1a5665875165..cc5774c64fae 100644
--- a/arch/powerpc/platforms/ps3/system-bus.c
+++ b/arch/powerpc/platforms/ps3/system-bus.c
@@ -381,7 +381,7 @@ static int ps3_system_bus_probe(struct device *_dev)
 	return result;
 }
 
-static int ps3_system_bus_remove(struct device *_dev)
+static void ps3_system_bus_remove(struct device *_dev)
 {
 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
 	struct ps3_system_bus_driver *drv;
@@ -399,7 +399,6 @@ static int ps3_system_bus_remove(struct device *_dev)
 			__func__, __LINE__, drv->core.name);
 
 	pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, dev_name(&dev->core));
-	return 0;
 }
 
 static void ps3_system_bus_shutdown(struct device *_dev)
diff --git a/arch/powerpc/platforms/pseries/ibmebus.c b/arch/powerpc/platforms/pseries/ibmebus.c
index c6c79ef55e13..7ee3ed7d6cc2 100644
--- a/arch/powerpc/platforms/pseries/ibmebus.c
+++ b/arch/powerpc/platforms/pseries/ibmebus.c
@@ -366,14 +366,13 @@ static int ibmebus_bus_device_probe(struct device *dev)
 	return error;
 }
 
-static int ibmebus_bus_device_remove(struct device *dev)
+static void ibmebus_bus_device_remove(struct device *dev)
 {
 	struct platform_device *of_dev = to_platform_device(dev);
 	struct platform_driver *drv = to_platform_driver(dev->driver);
 
 	if (dev->driver && drv->remove)
 		drv->remove(of_dev);
-	return 0;
 }
 
 static void ibmebus_bus_device_shutdown(struct device *dev)
diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c
index e00f3725ec96..58283cecbd52 100644
--- a/arch/powerpc/platforms/pseries/vio.c
+++ b/arch/powerpc/platforms/pseries/vio.c
@@ -1257,7 +1257,7 @@ static int vio_bus_probe(struct device *dev)
 }
 
 /* convert from struct device to struct vio_dev and pass to driver. */
-static int vio_bus_remove(struct device *dev)
+static void vio_bus_remove(struct device *dev)
 {
 	struct vio_dev *viodev = to_vio_dev(dev);
 	struct vio_driver *viodrv = to_vio_driver(dev->driver);
@@ -1276,7 +1276,6 @@ static int vio_bus_remove(struct device *dev)
 		vio_cmo_bus_remove(viodev);
 
 	put_device(devptr);
-	return 0;
 }
 
 static void vio_bus_shutdown(struct device *dev)
diff --git a/arch/sparc/kernel/vio.c b/arch/sparc/kernel/vio.c
index 348a88691219..01122a208f94 100644
--- a/arch/sparc/kernel/vio.c
+++ b/arch/sparc/kernel/vio.c
@@ -93,7 +93,7 @@ static int vio_device_probe(struct device *dev)
 	return drv->probe(vdev, id);
 }
 
-static int vio_device_remove(struct device *dev)
+static void vio_device_remove(struct device *dev)
 {
 	struct vio_dev *vdev = to_vio_dev(dev);
 	struct vio_driver *drv = to_vio_driver(dev->driver);
@@ -107,8 +107,6 @@ static int vio_device_remove(struct device *dev)
 
 		drv->remove(vdev);
 	}
-
-	return 0;
 }
 
 static ssize_t devspec_show(struct device *dev,