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Message-ID: <s5hv9dphnoh.wl-tiwai@suse.de>
Date: Sat, 28 Nov 2020 09:48:30 +0100
From: Takashi Iwai <tiwai@...e.de>
To: Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>
Cc: Geoff Levand <geoff@...radead.org>,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>,
Michael Ellerman <mpe@...erman.id.au>,
Jens Axboe <axboe@...nel.dk>, Jim Paris <jim@...n.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Alan Stern <stern@...land.harvard.edu>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
linuxppc-dev@...ts.ozlabs.org, alsa-devel@...a-project.org,
linux-block@...r.kernel.org, netdev@...r.kernel.org,
linux-scsi@...r.kernel.org, linux-usb@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH 2/2] powerpc/ps3: make system bus's remove and shutdown callbacks return void
On Thu, 26 Nov 2020 17:59:50 +0100,
Uwe Kleine-König wrote:
>
> The driver core ignores the return value of struct device_driver::remove
> because there is only little that can be done. For the shutdown callback
> it's ps3_system_bus_shutdown() which ignores the return value.
>
> To simplify the quest to make struct device_driver::remove return void,
> let struct ps3_system_bus_driver::remove return void, too. All users
> already unconditionally return 0, this commit makes it obvious that
> returning an error code is a bad idea and ensures future users behave
> accordingly.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
For the sound bit:
Acked-by: Takashi Iwai <tiwai@...e.de>
thanks,
Takashi
> ---
> arch/powerpc/include/asm/ps3.h | 4 ++--
> arch/powerpc/platforms/ps3/system-bus.c | 5 ++---
> drivers/block/ps3disk.c | 3 +--
> drivers/block/ps3vram.c | 3 +--
> drivers/char/ps3flash.c | 3 +--
> drivers/net/ethernet/toshiba/ps3_gelic_net.c | 3 +--
> drivers/ps3/ps3-lpm.c | 3 +--
> drivers/ps3/ps3-vuart.c | 10 ++++------
> drivers/scsi/ps3rom.c | 3 +--
> drivers/usb/host/ehci-ps3.c | 4 +---
> drivers/usb/host/ohci-ps3.c | 4 +---
> drivers/video/fbdev/ps3fb.c | 4 +---
> sound/ppc/snd_ps3.c | 3 +--
> 13 files changed, 18 insertions(+), 34 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/ps3.h b/arch/powerpc/include/asm/ps3.h
> index cb89e4bf55ce..e646c7f218bc 100644
> --- a/arch/powerpc/include/asm/ps3.h
> +++ b/arch/powerpc/include/asm/ps3.h
> @@ -378,8 +378,8 @@ struct ps3_system_bus_driver {
> enum ps3_match_sub_id match_sub_id;
> struct device_driver core;
> int (*probe)(struct ps3_system_bus_device *);
> - int (*remove)(struct ps3_system_bus_device *);
> - int (*shutdown)(struct ps3_system_bus_device *);
> + void (*remove)(struct ps3_system_bus_device *);
> + void (*shutdown)(struct ps3_system_bus_device *);
> /* int (*suspend)(struct ps3_system_bus_device *, pm_message_t); */
> /* int (*resume)(struct ps3_system_bus_device *); */
> };
> diff --git a/arch/powerpc/platforms/ps3/system-bus.c b/arch/powerpc/platforms/ps3/system-bus.c
> index c62aaa29a9d5..b431f41c6cb5 100644
> --- a/arch/powerpc/platforms/ps3/system-bus.c
> +++ b/arch/powerpc/platforms/ps3/system-bus.c
> @@ -382,7 +382,6 @@ static int ps3_system_bus_probe(struct device *_dev)
>
> static int ps3_system_bus_remove(struct device *_dev)
> {
> - int result = 0;
> struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
> struct ps3_system_bus_driver *drv;
>
> @@ -393,13 +392,13 @@ static int ps3_system_bus_remove(struct device *_dev)
> BUG_ON(!drv);
>
> if (drv->remove)
> - result = drv->remove(dev);
> + drv->remove(dev);
> else
> dev_dbg(&dev->core, "%s:%d %s: no remove method\n",
> __func__, __LINE__, drv->core.name);
>
> pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, dev_name(&dev->core));
> - return result;
> + return 0;
> }
>
> static void ps3_system_bus_shutdown(struct device *_dev)
> diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
> index 7b55811c2a81..ba3ece56cbb3 100644
> --- a/drivers/block/ps3disk.c
> +++ b/drivers/block/ps3disk.c
> @@ -507,7 +507,7 @@ static int ps3disk_probe(struct ps3_system_bus_device *_dev)
> return error;
> }
>
> -static int ps3disk_remove(struct ps3_system_bus_device *_dev)
> +static void ps3disk_remove(struct ps3_system_bus_device *_dev)
> {
> struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
> struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
> @@ -526,7 +526,6 @@ static int ps3disk_remove(struct ps3_system_bus_device *_dev)
> kfree(dev->bounce_buf);
> kfree(priv);
> ps3_system_bus_set_drvdata(_dev, NULL);
> - return 0;
> }
>
> static struct ps3_system_bus_driver ps3disk = {
> diff --git a/drivers/block/ps3vram.c b/drivers/block/ps3vram.c
> index 1088798c8dd0..b71d28372ef3 100644
> --- a/drivers/block/ps3vram.c
> +++ b/drivers/block/ps3vram.c
> @@ -797,7 +797,7 @@ static int ps3vram_probe(struct ps3_system_bus_device *dev)
> return error;
> }
>
> -static int ps3vram_remove(struct ps3_system_bus_device *dev)
> +static void ps3vram_remove(struct ps3_system_bus_device *dev)
> {
> struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
>
> @@ -817,7 +817,6 @@ static int ps3vram_remove(struct ps3_system_bus_device *dev)
> free_pages((unsigned long) priv->xdr_buf, get_order(XDR_BUF_SIZE));
> kfree(priv);
> ps3_system_bus_set_drvdata(dev, NULL);
> - return 0;
> }
>
> static struct ps3_system_bus_driver ps3vram = {
> diff --git a/drivers/char/ps3flash.c b/drivers/char/ps3flash.c
> index 1a07fee33f66..23871cde41fb 100644
> --- a/drivers/char/ps3flash.c
> +++ b/drivers/char/ps3flash.c
> @@ -403,7 +403,7 @@ static int ps3flash_probe(struct ps3_system_bus_device *_dev)
> return error;
> }
>
> -static int ps3flash_remove(struct ps3_system_bus_device *_dev)
> +static void ps3flash_remove(struct ps3_system_bus_device *_dev)
> {
> struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
>
> @@ -413,7 +413,6 @@ static int ps3flash_remove(struct ps3_system_bus_device *_dev)
> kfree(ps3_system_bus_get_drvdata(&dev->sbd));
> ps3_system_bus_set_drvdata(&dev->sbd, NULL);
> ps3flash_dev = NULL;
> - return 0;
> }
>
>
> diff --git a/drivers/net/ethernet/toshiba/ps3_gelic_net.c b/drivers/net/ethernet/toshiba/ps3_gelic_net.c
> index d9a5722f561b..3d1fc8d2ca66 100644
> --- a/drivers/net/ethernet/toshiba/ps3_gelic_net.c
> +++ b/drivers/net/ethernet/toshiba/ps3_gelic_net.c
> @@ -1791,7 +1791,7 @@ static int ps3_gelic_driver_probe(struct ps3_system_bus_device *dev)
> * ps3_gelic_driver_remove - remove a device from the control of this driver
> */
>
> -static int ps3_gelic_driver_remove(struct ps3_system_bus_device *dev)
> +static void ps3_gelic_driver_remove(struct ps3_system_bus_device *dev)
> {
> struct gelic_card *card = ps3_system_bus_get_drvdata(dev);
> struct net_device *netdev0;
> @@ -1840,7 +1840,6 @@ static int ps3_gelic_driver_remove(struct ps3_system_bus_device *dev)
> ps3_close_hv_device(dev);
>
> pr_debug("%s: done\n", __func__);
> - return 0;
> }
>
> static struct ps3_system_bus_driver ps3_gelic_driver = {
> diff --git a/drivers/ps3/ps3-lpm.c b/drivers/ps3/ps3-lpm.c
> index e54aa2d82f50..65512b6cc6fd 100644
> --- a/drivers/ps3/ps3-lpm.c
> +++ b/drivers/ps3/ps3-lpm.c
> @@ -1196,7 +1196,7 @@ static int ps3_lpm_probe(struct ps3_system_bus_device *dev)
> return 0;
> }
>
> -static int ps3_lpm_remove(struct ps3_system_bus_device *dev)
> +static void ps3_lpm_remove(struct ps3_system_bus_device *dev)
> {
> dev_dbg(&dev->core, " -> %s:%u:\n", __func__, __LINE__);
>
> @@ -1206,7 +1206,6 @@ static int ps3_lpm_remove(struct ps3_system_bus_device *dev)
> lpm_priv = NULL;
>
> dev_info(&dev->core, " <- %s:%u:\n", __func__, __LINE__);
> - return 0;
> }
>
> static struct ps3_system_bus_driver ps3_lpm_driver = {
> diff --git a/drivers/ps3/ps3-vuart.c b/drivers/ps3/ps3-vuart.c
> index 4ed131eaff51..e34ae6a442c7 100644
> --- a/drivers/ps3/ps3-vuart.c
> +++ b/drivers/ps3/ps3-vuart.c
> @@ -1102,7 +1102,7 @@ static int ps3_vuart_cleanup(struct ps3_system_bus_device *dev)
> * device can no longer be used.
> */
>
> -static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
> +static void ps3_vuart_remove(struct ps3_system_bus_device *dev)
> {
> struct ps3_vuart_port_priv *priv = to_port_priv(dev);
> struct ps3_vuart_port_driver *drv;
> @@ -1118,7 +1118,7 @@ static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
> dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
> __LINE__);
> mutex_unlock(&vuart_bus_priv.probe_mutex);
> - return 0;
> + return;
> }
>
> drv = ps3_system_bus_dev_to_vuart_drv(dev);
> @@ -1141,7 +1141,6 @@ static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
>
> dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
> mutex_unlock(&vuart_bus_priv.probe_mutex);
> - return 0;
> }
>
> /**
> @@ -1154,7 +1153,7 @@ static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
> * sequence.
> */
>
> -static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev)
> +static void ps3_vuart_shutdown(struct ps3_system_bus_device *dev)
> {
> struct ps3_vuart_port_driver *drv;
>
> @@ -1169,7 +1168,7 @@ static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev)
> dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
> __LINE__);
> mutex_unlock(&vuart_bus_priv.probe_mutex);
> - return 0;
> + return;
> }
>
> drv = ps3_system_bus_dev_to_vuart_drv(dev);
> @@ -1193,7 +1192,6 @@ static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev)
> dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
>
> mutex_unlock(&vuart_bus_priv.probe_mutex);
> - return 0;
> }
>
> static int __init ps3_vuart_bus_init(void)
> diff --git a/drivers/scsi/ps3rom.c b/drivers/scsi/ps3rom.c
> index f75c0b5cd587..ccb5771f1cb7 100644
> --- a/drivers/scsi/ps3rom.c
> +++ b/drivers/scsi/ps3rom.c
> @@ -402,7 +402,7 @@ static int ps3rom_probe(struct ps3_system_bus_device *_dev)
> return error;
> }
>
> -static int ps3rom_remove(struct ps3_system_bus_device *_dev)
> +static void ps3rom_remove(struct ps3_system_bus_device *_dev)
> {
> struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
> struct Scsi_Host *host = ps3_system_bus_get_drvdata(&dev->sbd);
> @@ -412,7 +412,6 @@ static int ps3rom_remove(struct ps3_system_bus_device *_dev)
> scsi_host_put(host);
> ps3_system_bus_set_drvdata(&dev->sbd, NULL);
> kfree(dev->bounce_buf);
> - return 0;
> }
>
> static struct ps3_system_bus_driver ps3rom = {
> diff --git a/drivers/usb/host/ehci-ps3.c b/drivers/usb/host/ehci-ps3.c
> index fb52133c3557..98568b046a1a 100644
> --- a/drivers/usb/host/ehci-ps3.c
> +++ b/drivers/usb/host/ehci-ps3.c
> @@ -200,7 +200,7 @@ static int ps3_ehci_probe(struct ps3_system_bus_device *dev)
> return result;
> }
>
> -static int ps3_ehci_remove(struct ps3_system_bus_device *dev)
> +static void ps3_ehci_remove(struct ps3_system_bus_device *dev)
> {
> unsigned int tmp;
> struct usb_hcd *hcd = ps3_system_bus_get_drvdata(dev);
> @@ -227,8 +227,6 @@ static int ps3_ehci_remove(struct ps3_system_bus_device *dev)
>
> ps3_dma_region_free(dev->d_region);
> ps3_close_hv_device(dev);
> -
> - return 0;
> }
>
> static int __init ps3_ehci_driver_register(struct ps3_system_bus_driver *drv)
> diff --git a/drivers/usb/host/ohci-ps3.c b/drivers/usb/host/ohci-ps3.c
> index f77cd6af0ccf..4f5af929c3e4 100644
> --- a/drivers/usb/host/ohci-ps3.c
> +++ b/drivers/usb/host/ohci-ps3.c
> @@ -184,7 +184,7 @@ static int ps3_ohci_probe(struct ps3_system_bus_device *dev)
> return result;
> }
>
> -static int ps3_ohci_remove(struct ps3_system_bus_device *dev)
> +static void ps3_ohci_remove(struct ps3_system_bus_device *dev)
> {
> unsigned int tmp;
> struct usb_hcd *hcd = ps3_system_bus_get_drvdata(dev);
> @@ -212,8 +212,6 @@ static int ps3_ohci_remove(struct ps3_system_bus_device *dev)
>
> ps3_dma_region_free(dev->d_region);
> ps3_close_hv_device(dev);
> -
> - return 0;
> }
>
> static int __init ps3_ohci_driver_register(struct ps3_system_bus_driver *drv)
> diff --git a/drivers/video/fbdev/ps3fb.c b/drivers/video/fbdev/ps3fb.c
> index 203c254f8f6c..2fe08b67eda7 100644
> --- a/drivers/video/fbdev/ps3fb.c
> +++ b/drivers/video/fbdev/ps3fb.c
> @@ -1208,7 +1208,7 @@ static int ps3fb_probe(struct ps3_system_bus_device *dev)
> return retval;
> }
>
> -static int ps3fb_shutdown(struct ps3_system_bus_device *dev)
> +static void ps3fb_shutdown(struct ps3_system_bus_device *dev)
> {
> struct fb_info *info = ps3_system_bus_get_drvdata(dev);
> u64 xdr_lpar = ps3_mm_phys_to_lpar(__pa(ps3fb_videomemory.address));
> @@ -1241,8 +1241,6 @@ static int ps3fb_shutdown(struct ps3_system_bus_device *dev)
> lv1_gpu_memory_free(ps3fb.memory_handle);
> ps3_close_hv_device(dev);
> dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
> -
> - return 0;
> }
>
> static struct ps3_system_bus_driver ps3fb_driver = {
> diff --git a/sound/ppc/snd_ps3.c b/sound/ppc/snd_ps3.c
> index 6ab796a5d936..8e44fa5d4dc7 100644
> --- a/sound/ppc/snd_ps3.c
> +++ b/sound/ppc/snd_ps3.c
> @@ -1049,7 +1049,7 @@ static int snd_ps3_driver_probe(struct ps3_system_bus_device *dev)
> }; /* snd_ps3_probe */
>
> /* called when module removal */
> -static int snd_ps3_driver_remove(struct ps3_system_bus_device *dev)
> +static void snd_ps3_driver_remove(struct ps3_system_bus_device *dev)
> {
> int ret;
> pr_info("%s:start id=%d\n", __func__, dev->match_id);
> @@ -1075,7 +1075,6 @@ static int snd_ps3_driver_remove(struct ps3_system_bus_device *dev)
> lv1_gpu_device_unmap(2);
> ps3_close_hv_device(dev);
> pr_info("%s:end id=%d\n", __func__, dev->match_id);
> - return 0;
> } /* snd_ps3_remove */
>
> static struct ps3_system_bus_driver snd_ps3_bus_driver_info = {
> --
> 2.29.2
>
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