From: Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
To: Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
Cc: Ben Dooks <ben-linux-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org>,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>,
Guan Xuetao <gxt-TG0Ac1+ktVePQbnJrJN+5g@public.gmane.org>,
Mauro Carvalho Chehab
<mchehab-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Ben Hutchings
<bhutchings-s/n/eUQHGBpZroRs9YW3xA@public.gmane.org>,
Greg Kroah-Hartman
<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
Alan Cox <alan-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
Nicolas Ferre
<nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>,
Aaro Koskinen <aaro.koskinen-X3B1VOXEql0@public.gmane.org>,
Shawn Guo <shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Benjamin Herrenschmidt
<benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>,
Lars Poeschel <poeschel-Xtl8qvBWbHwb1SvskN2V4Q@public.gmane.org>
Subject: Re: [PATCH 3/6] i2c: Ignore return value of i2c_del_adapter()
Date: Sat, 30 Mar 2013 07:34:05 +0100 [thread overview]
Message-ID: <20130330063405.GB3469@the-dreams.de> (raw)
In-Reply-To: <1362853009-20789-4-git-send-email-lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
On Sat, Mar 09, 2013 at 07:16:46PM +0100, Lars-Peter Clausen wrote:
> i2c_del_adapter() always returns 0. So all checks testing whether it will be
> non zero will always evaluate to false and the conditional code is dead code.
> This patch updates all callers of i2c_del_mux_adapter() to ignore the return
> value and assume that it will always succeed (which it will). In a subsequent
> patch the return type of i2c_del_adapter() will be made void.
>
> Cc: Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
> Cc: Guan Xuetao <gxt-TG0Ac1+ktVePQbnJrJN+5g@public.gmane.org>
> Cc: Mauro Carvalho Chehab <mchehab-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> Cc: Ben Hutchings <bhutchings-s/n/eUQHGBpZroRs9YW3xA@public.gmane.org>
> Cc: Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
> Cc: Alan Cox <alan-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> Cc: Nicolas Ferre <nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
> Cc: Aaro Koskinen <aaro.koskinen-X3B1VOXEql0@public.gmane.org>
> Cc: Marek Vasut <marex-ynQEQJNshbs@public.gmane.org> (commit_signer:11/20=55%)
> Cc: Shawn Guo <shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> Cc: Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
> Cc: Lars Poeschel <poeschel-Xtl8qvBWbHwb1SvskN2V4Q@public.gmane.org>
> Signed-off-by: Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
Ping for more acks outside the i2c realm.
> ---
> drivers/gpu/drm/gma500/oaktrail_hdmi_i2c.c | 3 +--
> drivers/i2c/busses/i2c-amd756-s4882.c | 6 +-----
> drivers/i2c/busses/i2c-at91.c | 5 ++---
> drivers/i2c/busses/i2c-cbus-gpio.c | 4 +++-
> drivers/i2c/busses/i2c-intel-mid.c | 3 +--
> drivers/i2c/busses/i2c-mv64xxx.c | 5 ++---
> drivers/i2c/busses/i2c-mxs.c | 5 +----
> drivers/i2c/busses/i2c-nforce2-s4985.c | 6 +-----
> drivers/i2c/busses/i2c-powermac.c | 10 ++--------
> drivers/i2c/busses/i2c-puv3.c | 10 ++--------
> drivers/i2c/busses/i2c-viperboard.c | 5 ++---
> drivers/i2c/i2c-mux.c | 5 +----
> drivers/media/pci/bt8xx/bttv-input.c | 6 +++---
> drivers/media/pci/mantis/mantis_i2c.c | 4 +++-
> drivers/net/ethernet/sfc/falcon.c | 6 ++----
> drivers/staging/media/go7007/go7007-driver.c | 7 ++-----
> 16 files changed, 29 insertions(+), 61 deletions(-)
>
> diff --git a/drivers/gpu/drm/gma500/oaktrail_hdmi_i2c.c b/drivers/gpu/drm/gma500/oaktrail_hdmi_i2c.c
> index 88627e3..1eb86c7 100644
> --- a/drivers/gpu/drm/gma500/oaktrail_hdmi_i2c.c
> +++ b/drivers/gpu/drm/gma500/oaktrail_hdmi_i2c.c
> @@ -319,8 +319,7 @@ void oaktrail_hdmi_i2c_exit(struct pci_dev *dev)
> struct hdmi_i2c_dev *i2c_dev;
>
> hdmi_dev = pci_get_drvdata(dev);
> - if (i2c_del_adapter(&oaktrail_hdmi_i2c_adapter))
> - DRM_DEBUG_DRIVER("Failed to delete hdmi-i2c adapter\n");
> + i2c_del_adapter(&oaktrail_hdmi_i2c_adapter);
>
> i2c_dev = hdmi_dev->i2c_dev;
> kfree(i2c_dev);
> diff --git a/drivers/i2c/busses/i2c-amd756-s4882.c b/drivers/i2c/busses/i2c-amd756-s4882.c
> index 378fcb5..07f01ac 100644
> --- a/drivers/i2c/busses/i2c-amd756-s4882.c
> +++ b/drivers/i2c/busses/i2c-amd756-s4882.c
> @@ -169,11 +169,7 @@ static int __init amd756_s4882_init(void)
> }
>
> /* Unregister physical bus */
> - error = i2c_del_adapter(&amd756_smbus);
> - if (error) {
> - dev_err(&amd756_smbus.dev, "Physical bus removal failed\n");
> - goto ERROR0;
> - }
> + i2c_del_adapter(&amd756_smbus);
>
> printk(KERN_INFO "Enabling SMBus multiplexing for Tyan S4882\n");
> /* Define the 5 virtual adapters and algorithms structures */
> diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
> index 75195e3..6604587 100644
> --- a/drivers/i2c/busses/i2c-at91.c
> +++ b/drivers/i2c/busses/i2c-at91.c
> @@ -785,12 +785,11 @@ static int at91_twi_probe(struct platform_device *pdev)
> static int at91_twi_remove(struct platform_device *pdev)
> {
> struct at91_twi_dev *dev = platform_get_drvdata(pdev);
> - int rc;
>
> - rc = i2c_del_adapter(&dev->adapter);
> + i2c_del_adapter(&dev->adapter);
> clk_disable_unprepare(dev->clk);
>
> - return rc;
> + return 0;
> }
>
> #ifdef CONFIG_PM
> diff --git a/drivers/i2c/busses/i2c-cbus-gpio.c b/drivers/i2c/busses/i2c-cbus-gpio.c
> index 98386d6..1be13ac 100644
> --- a/drivers/i2c/busses/i2c-cbus-gpio.c
> +++ b/drivers/i2c/busses/i2c-cbus-gpio.c
> @@ -206,7 +206,9 @@ static int cbus_i2c_remove(struct platform_device *pdev)
> {
> struct i2c_adapter *adapter = platform_get_drvdata(pdev);
>
> - return i2c_del_adapter(adapter);
> + i2c_del_adapter(adapter);
> +
> + return 0;
> }
>
> static int cbus_i2c_probe(struct platform_device *pdev)
> diff --git a/drivers/i2c/busses/i2c-intel-mid.c b/drivers/i2c/busses/i2c-intel-mid.c
> index 323fa01..0fb6597 100644
> --- a/drivers/i2c/busses/i2c-intel-mid.c
> +++ b/drivers/i2c/busses/i2c-intel-mid.c
> @@ -1082,8 +1082,7 @@ static void intel_mid_i2c_remove(struct pci_dev *dev)
> {
> struct intel_mid_i2c_private *mrst = pci_get_drvdata(dev);
> intel_mid_i2c_disable(&mrst->adap);
> - if (i2c_del_adapter(&mrst->adap))
> - dev_err(&dev->dev, "Failed to delete i2c adapter");
> + i2c_del_adapter(&mrst->adap);
>
> free_irq(dev->irq, mrst);
> iounmap(mrst->base);
> diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
> index 8b20ef8..3bbd65d 100644
> --- a/drivers/i2c/busses/i2c-mv64xxx.c
> +++ b/drivers/i2c/busses/i2c-mv64xxx.c
> @@ -701,9 +701,8 @@ static int
> mv64xxx_i2c_remove(struct platform_device *dev)
> {
> struct mv64xxx_i2c_data *drv_data = platform_get_drvdata(dev);
> - int rc;
>
> - rc = i2c_del_adapter(&drv_data->adapter);
> + i2c_del_adapter(&drv_data->adapter);
> free_irq(drv_data->irq, drv_data);
> mv64xxx_i2c_unmap_regs(drv_data);
> #if defined(CONFIG_HAVE_CLK)
> @@ -715,7 +714,7 @@ mv64xxx_i2c_remove(struct platform_device *dev)
> #endif
> kfree(drv_data);
>
> - return rc;
> + return 0;
> }
>
> static const struct of_device_id mv64xxx_i2c_of_match_table[] = {
> diff --git a/drivers/i2c/busses/i2c-mxs.c b/drivers/i2c/busses/i2c-mxs.c
> index 120f246..804eb6b 100644
> --- a/drivers/i2c/busses/i2c-mxs.c
> +++ b/drivers/i2c/busses/i2c-mxs.c
> @@ -686,11 +686,8 @@ static int mxs_i2c_probe(struct platform_device *pdev)
> static int mxs_i2c_remove(struct platform_device *pdev)
> {
> struct mxs_i2c_dev *i2c = platform_get_drvdata(pdev);
> - int ret;
>
> - ret = i2c_del_adapter(&i2c->adapter);
> - if (ret)
> - return -EBUSY;
> + i2c_del_adapter(&i2c->adapter);
>
> if (i2c->dmach)
> dma_release_channel(i2c->dmach);
> diff --git a/drivers/i2c/busses/i2c-nforce2-s4985.c b/drivers/i2c/busses/i2c-nforce2-s4985.c
> index 29015eb..2ca268d 100644
> --- a/drivers/i2c/busses/i2c-nforce2-s4985.c
> +++ b/drivers/i2c/busses/i2c-nforce2-s4985.c
> @@ -164,11 +164,7 @@ static int __init nforce2_s4985_init(void)
> }
>
> /* Unregister physical bus */
> - error = i2c_del_adapter(nforce2_smbus);
> - if (error) {
> - dev_err(&nforce2_smbus->dev, "Physical bus removal failed\n");
> - goto ERROR0;
> - }
> + i2c_del_adapter(nforce2_smbus);
>
> printk(KERN_INFO "Enabling SMBus multiplexing for Tyan S4985\n");
> /* Define the 5 virtual adapters and algorithms structures */
> diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c
> index da54e67..8dc90da 100644
> --- a/drivers/i2c/busses/i2c-powermac.c
> +++ b/drivers/i2c/busses/i2c-powermac.c
> @@ -213,14 +213,8 @@ static const struct i2c_algorithm i2c_powermac_algorithm = {
> static int i2c_powermac_remove(struct platform_device *dev)
> {
> struct i2c_adapter *adapter = platform_get_drvdata(dev);
> - int rc;
> -
> - rc = i2c_del_adapter(adapter);
> - /* We aren't that prepared to deal with this... */
> - if (rc)
> - printk(KERN_WARNING
> - "i2c-powermac.c: Failed to remove bus %s !\n",
> - adapter->name);
> +
> + i2c_del_adapter(adapter);
> memset(adapter, 0, sizeof(*adapter));
>
> return 0;
> diff --git a/drivers/i2c/busses/i2c-puv3.c b/drivers/i2c/busses/i2c-puv3.c
> index 261d7db..4fd47bc 100644
> --- a/drivers/i2c/busses/i2c-puv3.c
> +++ b/drivers/i2c/busses/i2c-puv3.c
> @@ -234,21 +234,15 @@ static int puv3_i2c_remove(struct platform_device *pdev)
> {
> struct i2c_adapter *adapter = platform_get_drvdata(pdev);
> struct resource *mem;
> - int rc;
>
> - rc = i2c_del_adapter(adapter);
> - if (rc) {
> - dev_err(&pdev->dev, "Adapter '%s' delete fail\n",
> - adapter->name);
> - return rc;
> - }
> + i2c_del_adapter(adapter);
>
> put_device(&pdev->dev);
>
> mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> release_mem_region(mem->start, resource_size(mem));
>
> - return rc;
> + return 0;
> }
>
> #ifdef CONFIG_PM
> diff --git a/drivers/i2c/busses/i2c-viperboard.c b/drivers/i2c/busses/i2c-viperboard.c
> index f45c32c..c68450c 100644
> --- a/drivers/i2c/busses/i2c-viperboard.c
> +++ b/drivers/i2c/busses/i2c-viperboard.c
> @@ -421,11 +421,10 @@ error:
> static int vprbrd_i2c_remove(struct platform_device *pdev)
> {
> struct vprbrd_i2c *vb_i2c = platform_get_drvdata(pdev);
> - int ret;
>
> - ret = i2c_del_adapter(&vb_i2c->i2c);
> + i2c_del_adapter(&vb_i2c->i2c);
>
> - return ret;
> + return 0;
> }
>
> static struct platform_driver vprbrd_i2c_driver = {
> diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
> index d94e0ce..361b78d 100644
> --- a/drivers/i2c/i2c-mux.c
> +++ b/drivers/i2c/i2c-mux.c
> @@ -194,11 +194,8 @@ EXPORT_SYMBOL_GPL(i2c_add_mux_adapter);
> int i2c_del_mux_adapter(struct i2c_adapter *adap)
> {
> struct i2c_mux_priv *priv = adap->algo_data;
> - int ret;
>
> - ret = i2c_del_adapter(adap);
> - if (ret < 0)
> - return ret;
> + i2c_del_adapter(adap);
> kfree(priv);
>
> return 0;
> diff --git a/drivers/media/pci/bt8xx/bttv-input.c b/drivers/media/pci/bt8xx/bttv-input.c
> index 04207a7..f42d26d 100644
> --- a/drivers/media/pci/bt8xx/bttv-input.c
> +++ b/drivers/media/pci/bt8xx/bttv-input.c
> @@ -413,10 +413,10 @@ void init_bttv_i2c_ir(struct bttv *btv)
>
> int fini_bttv_i2c(struct bttv *btv)
> {
> - if (0 != btv->i2c_rc)
> - return 0;
> + if (btv->i2c_rc == 0)
> + i2c_del_adapter(&btv->c.i2c_adap);
>
> - return i2c_del_adapter(&btv->c.i2c_adap);
> + return 0;
> }
>
> int bttv_input_init(struct bttv *btv)
> diff --git a/drivers/media/pci/mantis/mantis_i2c.c b/drivers/media/pci/mantis/mantis_i2c.c
> index 937fb9d..895ddba 100644
> --- a/drivers/media/pci/mantis/mantis_i2c.c
> +++ b/drivers/media/pci/mantis/mantis_i2c.c
> @@ -261,6 +261,8 @@ int mantis_i2c_exit(struct mantis_pci *mantis)
> mmwrite((intmask & ~MANTIS_INT_I2CDONE), MANTIS_INT_MASK);
>
> dprintk(MANTIS_DEBUG, 1, "Removing I2C adapter");
> - return i2c_del_adapter(&mantis->adapter);
> + i2c_del_adapter(&mantis->adapter);
> +
> + return 0;
> }
> EXPORT_SYMBOL_GPL(mantis_i2c_exit);
> diff --git a/drivers/net/ethernet/sfc/falcon.c b/drivers/net/ethernet/sfc/falcon.c
> index 49bcd19..defed0e 100644
> --- a/drivers/net/ethernet/sfc/falcon.c
> +++ b/drivers/net/ethernet/sfc/falcon.c
> @@ -1528,7 +1528,7 @@ static int falcon_probe_nic(struct efx_nic *efx)
> return 0;
>
> fail6:
> - BUG_ON(i2c_del_adapter(&board->i2c_adap));
> + i2c_del_adapter(&board->i2c_adap);
> memset(&board->i2c_adap, 0, sizeof(board->i2c_adap));
> fail5:
> efx_nic_free_buffer(efx, &efx->irq_status);
> @@ -1665,13 +1665,11 @@ static void falcon_remove_nic(struct efx_nic *efx)
> {
> struct falcon_nic_data *nic_data = efx->nic_data;
> struct falcon_board *board = falcon_board(efx);
> - int rc;
>
> board->type->fini(efx);
>
> /* Remove I2C adapter and clear it in preparation for a retry */
> - rc = i2c_del_adapter(&board->i2c_adap);
> - BUG_ON(rc);
> + i2c_del_adapter(&board->i2c_adap);
> memset(&board->i2c_adap, 0, sizeof(board->i2c_adap));
>
> efx_nic_free_buffer(efx, &efx->irq_status);
> diff --git a/drivers/staging/media/go7007/go7007-driver.c b/drivers/staging/media/go7007/go7007-driver.c
> index 6695091..6f83c52 100644
> --- a/drivers/staging/media/go7007/go7007-driver.c
> +++ b/drivers/staging/media/go7007/go7007-driver.c
> @@ -647,11 +647,8 @@ EXPORT_SYMBOL(go7007_alloc);
> void go7007_remove(struct go7007 *go)
> {
> if (go->i2c_adapter_online) {
> - if (i2c_del_adapter(&go->i2c_adapter) == 0)
> - go->i2c_adapter_online = 0;
> - else
> - v4l2_err(&go->v4l2_dev,
> - "error removing I2C adapter!\n");
> + i2c_del_adapter(&go->i2c_adapter);
> + go->i2c_adapter_online = 0;
> }
>
> if (go->audio_enabled)
> --
> 1.8.0
>
next prev parent reply other threads:[~2013-03-30 6:34 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-09 18:16 [PATCH 0/6] Make return type of i2c_del_adapter() (and i2c_del_mux_adapter()) void Lars-Peter Clausen
2013-03-09 18:16 ` [PATCH 1/6] i2c: Remove detach_adapter Lars-Peter Clausen
[not found] ` <1362853009-20789-2-git-send-email-lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-03-30 14:52 ` Jean Delvare
2013-03-09 18:16 ` [PATCH 2/6] i2c: i2c_del_adapter: Don't treat removing a non-registered adapter as error Lars-Peter Clausen
[not found] ` <1362853009-20789-3-git-send-email-lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-03-30 18:17 ` Jean Delvare
2013-03-09 18:16 ` [PATCH 3/6] i2c: Ignore return value of i2c_del_adapter() Lars-Peter Clausen
[not found] ` <1362853009-20789-4-git-send-email-lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-03-11 17:52 ` Ben Hutchings
2013-03-30 6:34 ` Wolfram Sang [this message]
2013-03-30 7:55 ` Jean Delvare
[not found] ` <20130330085539.442321fa-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2013-03-30 8:11 ` Lars-Peter Clausen
[not found] ` <51569E4A.2080006-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-03-30 8:43 ` Jean Delvare
2013-03-31 13:12 ` Shawn Guo
2013-03-31 8:25 ` Jean Delvare
2013-03-09 18:16 ` [PATCH 4/6] i2c: Make return type of i2c_del_adapter() void Lars-Peter Clausen
[not found] ` <1362853009-20789-5-git-send-email-lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-03-31 9:04 ` Jean Delvare
2013-03-09 18:16 ` [PATCH 5/6] i2c: Ignore the return value of i2c_del_mux_adapter() Lars-Peter Clausen
[not found] ` <1362853009-20789-6-git-send-email-lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-03-13 6:05 ` [5/6] " Guenter Roeck
2013-03-31 9:23 ` [PATCH 5/6] " Jean Delvare
2013-03-09 18:16 ` [PATCH 6/6] i2c: Make the return type of i2c_del_mux_adapter() void Lars-Peter Clausen
[not found] ` <1362853009-20789-7-git-send-email-lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-03-31 9:24 ` Jean Delvare
2013-03-30 6:33 ` [PATCH 0/6] Make return type of i2c_del_adapter() (and i2c_del_mux_adapter()) void Wolfram Sang
[not found] ` <1362853009-20789-1-git-send-email-lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-03-30 20:13 ` Jean Delvare
2013-03-30 20:43 ` Lars-Peter Clausen
[not found] ` <51574E71.7010403-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
2013-03-31 7:56 ` Jean Delvare
2013-03-31 11:30 ` Jean Delvare
2013-04-02 5:09 ` Wolfram Sang
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