i2c: Remove unneeded xxx_set_drvdata(..., NULL) calls

There is simply no reason to be manually setting the private driver
data to NULL in the remove/fail to probe cases.  This is just extra
cruft code that can be removed.

A few notes:
* Nothing relies on drvdata being set to NULL.
* The __device_release_driver() function eventually calls
  dev_set_drvdata(dev, NULL) anyway, so there's no need to do it
  twice.
* I verified that there were no cases where xxx_get_drvdata() was
  being called in these drivers and checking for / relying on the NULL
  return value.

This could be cleaned up kernel-wide but for now just take the baby
step and remove from the i2c subsystem.
Reported-by: Wolfram Sang <wsa@the-dreams.de>
Reported-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Wolfram Sang <wolfram@the-dreams.de>

drivers/i2c/busses/i2c-au1550.c

@@ -376,7 +376,6 @@ static int i2c_au1550_remove(struct platform_device *pdev)
 {
 	struct i2c_au1550_data *priv = platform_get_drvdata(pdev);
 
-	platform_set_drvdata(pdev, NULL);
 	i2c_del_adapter(&priv->adap);
 	i2c_au1550_disable(priv);
 	iounmap(priv->psc_base);

drivers/i2c/busses/i2c-bfin-twi.c

@@ -724,8 +724,6 @@ static int i2c_bfin_twi_remove(struct platform_device *pdev)
 {
 	struct bfin_twi_iface *iface = platform_get_drvdata(pdev);
 
-	platform_set_drvdata(pdev, NULL);
-
 	i2c_del_adapter(&(iface->adap));
 	free_irq(iface->irq, iface);
 	peripheral_free_list((unsigned short *)pdev->dev.platform_data);

drivers/i2c/busses/i2c-cpm.c

@@ -682,7 +682,6 @@ static int cpm_i2c_probe(struct platform_device *ofdev)
 out_shut:
 	cpm_i2c_shutdown(cpm);
 out_free:
-	dev_set_drvdata(&ofdev->dev, NULL);
 	kfree(cpm);
 
 	return result;
@@ -696,7 +695,6 @@ static int cpm_i2c_remove(struct platform_device *ofdev)
 
 	cpm_i2c_shutdown(cpm);
 
-	dev_set_drvdata(&ofdev->dev, NULL);
 	kfree(cpm);
 
 	return 0;

drivers/i2c/busses/i2c-davinci.c

@@ -755,7 +755,6 @@ static int davinci_i2c_probe(struct platform_device *pdev)
 	clk_put(dev->clk);
 	dev->clk = NULL;
 err_free_mem:
-	platform_set_drvdata(pdev, NULL);
 	put_device(&pdev->dev);
 	kfree(dev);
 err_release_region:
@@ -771,7 +770,6 @@ static int davinci_i2c_remove(struct platform_device *pdev)
 
 	i2c_davinci_cpufreq_deregister(dev);
 
-	platform_set_drvdata(pdev, NULL);
 	i2c_del_adapter(&dev->adapter);
 	put_device(&pdev->dev);
 

drivers/i2c/busses/i2c-designware-pcidrv.c

@@ -319,7 +319,6 @@ const struct pci_device_id *id)
 	free_irq(pdev->irq, dev);
 err_iounmap:
 	iounmap(dev->base);
-	pci_set_drvdata(pdev, NULL);
 	put_device(&pdev->dev);
 	kfree(dev);
 err_release_region:
@@ -336,7 +335,6 @@ static void i2c_dw_pci_remove(struct pci_dev *pdev)
 	pm_runtime_forbid(&pdev->dev);
 	pm_runtime_get_noresume(&pdev->dev);
 
-	pci_set_drvdata(pdev, NULL);
 	i2c_del_adapter(&dev->adapter);
 	put_device(&pdev->dev);
 

drivers/i2c/busses/i2c-designware-platdrv.c

@@ -207,7 +207,6 @@ static int dw_i2c_probe(struct platform_device *pdev)
 	clk_put(dev->clk);
 	dev->clk = NULL;
 err_free_mem:
-	platform_set_drvdata(pdev, NULL);
 	put_device(&pdev->dev);
 	kfree(dev);
 err_release_region:
@@ -221,7 +220,6 @@ static int dw_i2c_remove(struct platform_device *pdev)
 	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
 	struct resource *mem;
 
-	platform_set_drvdata(pdev, NULL);
 	pm_runtime_get_sync(&pdev->dev);
 
 	i2c_del_adapter(&dev->adapter);

drivers/i2c/busses/i2c-eg20t.c

@@ -869,8 +869,6 @@ static void pch_i2c_remove(struct pci_dev *pdev)
 	for (i = 0; i < adap_info->ch_num; i++)
 		adap_info->pch_data[i].pch_base_address = NULL;
 
-	pci_set_drvdata(pdev, NULL);
-
 	pci_release_regions(pdev);
 
 	pci_disable_device(pdev);

drivers/i2c/busses/i2c-highlander.c

@@ -436,8 +436,6 @@ static int highlander_i2c_probe(struct platform_device *pdev)
 err:
 	kfree(dev);
 
-	platform_set_drvdata(pdev, NULL);
-
 	return ret;
 }
 
@@ -453,8 +451,6 @@ static int highlander_i2c_remove(struct platform_device *pdev)
 	iounmap(dev->base);
 	kfree(dev);
 
-	platform_set_drvdata(pdev, NULL);
-
 	return 0;
 }
 

drivers/i2c/busses/i2c-i801.c

@@ -1254,7 +1254,6 @@ static void i801_remove(struct pci_dev *dev)
 		free_irq(dev->irq, priv);
 	pci_release_region(dev, SMBBAR);
 
-	pci_set_drvdata(dev, NULL);
 	kfree(priv);
 	/*
 	 * do not call pci_disable_device(dev) since it can cause hard hangs on

drivers/i2c/busses/i2c-ibm_iic.c

@@ -773,7 +773,6 @@ static int iic_probe(struct platform_device *ofdev)
 	if (dev->vaddr)
 		iounmap(dev->vaddr);
 
-	dev_set_drvdata(&ofdev->dev, NULL);
 	kfree(dev);
 	return ret;
 }
@@ -785,8 +784,6 @@ static int iic_remove(struct platform_device *ofdev)
 {
 	struct ibm_iic_private *dev = dev_get_drvdata(&ofdev->dev);
 
-	dev_set_drvdata(&ofdev->dev, NULL);
-
 	i2c_del_adapter(&dev->adap);
 
 	if (dev->irq) {

drivers/i2c/busses/i2c-imx.c

@@ -605,7 +605,6 @@ static int __exit i2c_imx_remove(struct platform_device *pdev)
 	/* remove adapter */
 	dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n");
 	i2c_del_adapter(&i2c_imx->adapter);
-	platform_set_drvdata(pdev, NULL);
 
 	/* setup chip registers to defaults */
 	writeb(0, i2c_imx->base + IMX_I2C_IADR);

drivers/i2c/busses/i2c-intel-mid.c

@@ -1069,7 +1069,6 @@ static int intel_mid_i2c_probe(struct pci_dev *dev,
 fail3:
 	free_irq(dev->irq, mrst);
 fail2:
-	pci_set_drvdata(dev, NULL);
 	kfree(mrst);
 fail1:
 	iounmap(base);
@@ -1087,7 +1086,6 @@ static void intel_mid_i2c_remove(struct pci_dev *dev)
 		dev_err(&dev->dev, "Failed to delete i2c adapter");
 
 	free_irq(dev->irq, mrst);
-	pci_set_drvdata(dev, NULL);
 	iounmap(mrst->base);
 	kfree(mrst);
 	pci_release_region(dev, 0);

drivers/i2c/busses/i2c-iop3xx.c

@@ -415,8 +415,6 @@ iop3xx_i2c_remove(struct platform_device *pdev)
 	kfree(adapter_data);
 	kfree(padapter);
 
-	platform_set_drvdata(pdev, NULL);
-
 	return 0;
 }
 

drivers/i2c/busses/i2c-mpc.c

@@ -696,7 +696,6 @@ static int fsl_i2c_probe(struct platform_device *op)
 	return result;
 
  fail_add:
-	dev_set_drvdata(&op->dev, NULL);
 	free_irq(i2c->irq, i2c);
  fail_request:
 	irq_dispose_mapping(i2c->irq);
@@ -711,7 +710,6 @@ static int fsl_i2c_remove(struct platform_device *op)
 	struct mpc_i2c *i2c = dev_get_drvdata(&op->dev);
 
 	i2c_del_adapter(&i2c->adap);
-	dev_set_drvdata(&op->dev, NULL);
 
 	if (i2c->irq)
 		free_irq(i2c->irq, i2c);

drivers/i2c/busses/i2c-mxs.c

@@ -697,8 +697,6 @@ static int mxs_i2c_remove(struct platform_device *pdev)
 
 	writel(MXS_I2C_CTRL0_SFTRST, i2c->regs + MXS_I2C_CTRL0_SET);
 
-	platform_set_drvdata(pdev, NULL);
-
 	return 0;
 }
 

drivers/i2c/busses/i2c-nomadik.c

@@ -1105,7 +1105,6 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
  err_irq:
 	iounmap(dev->virtbase);
  err_no_ioremap:
-	amba_set_drvdata(adev, NULL);
 	kfree(dev);
  err_pinctrl:
  err_no_mem:
@@ -1130,7 +1129,6 @@ static int nmk_i2c_remove(struct amba_device *adev)
 		release_mem_region(res->start, resource_size(res));
 	clk_put(dev->clk);
 	pm_runtime_disable(&adev->dev);
-	amba_set_drvdata(adev, NULL);
 	kfree(dev);
 
 	return 0;

drivers/i2c/busses/i2c-ocores.c

@@ -451,7 +451,6 @@ static int ocores_i2c_remove(struct platform_device *pdev)
 
 	/* remove adapter & data */
 	i2c_del_adapter(&i2c->adap);
-	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }

drivers/i2c/busses/i2c-octeon.c

@@ -595,7 +595,7 @@ static int octeon_i2c_probe(struct platform_device *pdev)
 	result = i2c_add_adapter(&i2c->adap);
 	if (result < 0) {
 		dev_err(i2c->dev, "failed to add adapter\n");
-		goto fail_add;
+		goto out;
 	}
 	dev_info(i2c->dev, "version %s\n", DRV_VERSION);
 
@@ -603,8 +603,6 @@ static int octeon_i2c_probe(struct platform_device *pdev)
 
 	return 0;
 
-fail_add:
-	platform_set_drvdata(pdev, NULL);
 out:
 	return result;
 };
@@ -614,7 +612,6 @@ static int octeon_i2c_remove(struct platform_device *pdev)
 	struct octeon_i2c *i2c = platform_get_drvdata(pdev);
 
 	i2c_del_adapter(&i2c->adap);
-	platform_set_drvdata(pdev, NULL);
 	return 0;
 };
 

drivers/i2c/busses/i2c-omap.c

@@ -1262,7 +1262,6 @@ omap_i2c_probe(struct platform_device *pdev)
 	pm_runtime_put(dev->dev);
 	pm_runtime_disable(&pdev->dev);
 err_free_mem:
-	platform_set_drvdata(pdev, NULL);
 
 	return r;
 }
@@ -1272,8 +1271,6 @@ static int omap_i2c_remove(struct platform_device *pdev)
 	struct omap_i2c_dev	*dev = platform_get_drvdata(pdev);
 	int ret;
 
-	platform_set_drvdata(pdev, NULL);
-
 	i2c_del_adapter(&dev->adapter);
 	ret = pm_runtime_get_sync(&pdev->dev);
 	if (IS_ERR_VALUE(ret))

drivers/i2c/busses/i2c-pca-platform.c

@@ -260,7 +260,6 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
 static int i2c_pca_pf_remove(struct platform_device *pdev)
 {
 	struct i2c_pca_pf_data *i2c = platform_get_drvdata(pdev);
-	platform_set_drvdata(pdev, NULL);
 
 	i2c_del_adapter(&i2c->adap);
 

drivers/i2c/busses/i2c-pmcmsp.c

@@ -349,7 +349,6 @@ static int pmcmsptwi_probe(struct platform_device *pldev)
 	return 0;
 
 ret_unmap:
-	platform_set_drvdata(pldev, NULL);
 	if (pmcmsptwi_data.irq) {
 		pmcmsptwi_writel(0,
 			pmcmsptwi_data.iobase + MSP_TWI_INT_MSK_REG_OFFSET);
@@ -374,7 +373,6 @@ static int pmcmsptwi_remove(struct platform_device *pldev)
 
 	i2c_del_adapter(&pmcmsptwi_adapter);
 
-	platform_set_drvdata(pldev, NULL);
 	if (pmcmsptwi_data.irq) {
 		pmcmsptwi_writel(0,
 			pmcmsptwi_data.iobase + MSP_TWI_INT_MSK_REG_OFFSET);

drivers/i2c/busses/i2c-pnx.c

@@ -761,7 +761,6 @@ static int i2c_pnx_probe(struct platform_device *pdev)
 out_drvdata:
 	kfree(alg_data);
 err_kzalloc:
-	platform_set_drvdata(pdev, NULL);
 	return ret;
 }
 
@@ -776,7 +775,6 @@ static int i2c_pnx_remove(struct platform_device *pdev)
 	release_mem_region(alg_data->base, I2C_PNX_REGION_SIZE);
 	clk_put(alg_data->clk);
 	kfree(alg_data);
-	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }

drivers/i2c/busses/i2c-powermac.c

@@ -221,7 +221,6 @@ static int i2c_powermac_remove(struct platform_device *dev)
 		printk(KERN_WARNING
 		       "i2c-powermac.c: Failed to remove bus %s !\n",
 		       adapter->name);
-	platform_set_drvdata(dev, NULL);
 	memset(adapter, 0, sizeof(*adapter));
 
 	return 0;

drivers/i2c/busses/i2c-puv3.c

@@ -223,7 +223,6 @@ static int puv3_i2c_probe(struct platform_device *pdev)
 	return 0;
 
 fail_add_adapter:
-	platform_set_drvdata(pdev, NULL);
 	kfree(adapter);
 fail_nomem:
 	release_mem_region(mem->start, resource_size(mem));
@@ -245,7 +244,6 @@ static int puv3_i2c_remove(struct platform_device *pdev)
 	}
 
 	put_device(&pdev->dev);
-	platform_set_drvdata(pdev, NULL);
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(mem->start, resource_size(mem));

drivers/i2c/busses/i2c-pxa-pci.c

@@ -128,7 +128,6 @@ static int ce4100_i2c_probe(struct pci_dev *dev,
 	return 0;
 
 err_dev_add:
-	pci_set_drvdata(dev, NULL);
 	kfree(sds);
 err_mem:
 	pci_disable_device(dev);
@@ -141,7 +140,6 @@ static void ce4100_i2c_remove(struct pci_dev *dev)
 	unsigned int i;
 
 	sds = pci_get_drvdata(dev);
-	pci_set_drvdata(dev, NULL);
 
 	for (i = 0; i < ARRAY_SIZE(sds->pdev); i++)
 		platform_device_unregister(sds->pdev[i]);

drivers/i2c/busses/i2c-pxa.c

@@ -1219,8 +1219,6 @@ static int i2c_pxa_remove(struct platform_device *dev)
 {
 	struct pxa_i2c *i2c = platform_get_drvdata(dev);
 
-	platform_set_drvdata(dev, NULL);
-
 	i2c_del_adapter(&i2c->adap);
 	if (!i2c->use_pio)
 		free_irq(i2c->irq, i2c);

drivers/i2c/busses/i2c-s6000.c

@@ -365,7 +365,6 @@ static int s6i2c_remove(struct platform_device *pdev)
 {
 	struct s6i2c_if *iface = platform_get_drvdata(pdev);
 	i2c_wr16(iface, S6_I2C_ENABLE, 0);
-	platform_set_drvdata(pdev, NULL);
 	i2c_del_adapter(&iface->adap);
 	free_irq(iface->irq, iface);
 	clk_disable(iface->clk);

drivers/i2c/busses/i2c-sh7760.c

@@ -546,7 +546,6 @@ static int sh7760_i2c_remove(struct platform_device *pdev)
 	release_resource(id->ioarea);
 	kfree(id->ioarea);
 	kfree(id);
-	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }

drivers/i2c/busses/i2c-stu300.c

@@ -975,7 +975,6 @@ stu300_remove(struct platform_device *pdev)
 	i2c_del_adapter(&dev->adapter);
 	/* Turn off everything */
 	stu300_wr8(0x00, dev->virtbase + I2C_CR);
-	platform_set_drvdata(pdev, NULL);
 	return 0;
 }
 

drivers/i2c/busses/i2c-taos-evm.c

@@ -271,7 +271,6 @@ static int taos_connect(struct serio *serio, struct serio_driver *drv)
  exit_close:
 	serio_close(serio);
  exit_kfree:
-	serio_set_drvdata(serio, NULL);
 	kfree(taos);
  exit:
 	return err;
@@ -285,7 +284,6 @@ static void taos_disconnect(struct serio *serio)
 		i2c_unregister_device(taos->client);
 	i2c_del_adapter(&taos->adapter);
 	serio_close(serio);
-	serio_set_drvdata(serio, NULL);
 	kfree(taos);
 
 	dev_info(&serio->dev, "Disconnected from TAOS EVM\n");

drivers/i2c/busses/i2c-versatile.c

@@ -125,8 +125,6 @@ static int i2c_versatile_remove(struct platform_device *dev)
 {
 	struct i2c_versatile *i2c = platform_get_drvdata(dev);
 
-	platform_set_drvdata(dev, NULL);
-
 	i2c_del_adapter(&i2c->adap);
 	return 0;
 }

drivers/i2c/busses/i2c-xiic.c

@@ -784,8 +784,6 @@ static int xiic_i2c_remove(struct platform_device *pdev)
 
 	xiic_deinit(i2c);
 
-	platform_set_drvdata(pdev, NULL);
-
 	free_irq(platform_get_irq(pdev, 0), i2c);
 
 	iounmap(i2c->base);

drivers/i2c/busses/i2c-xlr.c

@@ -257,7 +257,6 @@ static int xlr_i2c_remove(struct platform_device *pdev)
 
 	priv = platform_get_drvdata(pdev);
 	i2c_del_adapter(&priv->adap);
-	platform_set_drvdata(pdev, NULL);
 	return 0;
 }
 

drivers/i2c/busses/scx200_acb.c

@@ -542,7 +542,6 @@ static int scx200_remove(struct platform_device *pdev)
 	struct scx200_acb_iface *iface;
 
 	iface = platform_get_drvdata(pdev);
-	platform_set_drvdata(pdev, NULL);
 	scx200_cleanup_iface(iface);
 
 	return 0;

drivers/i2c/muxes/i2c-mux-gpio.c

@@ -250,7 +250,6 @@ static int i2c_mux_gpio_remove(struct platform_device *pdev)
 	for (i = 0; i < mux->data.n_gpios; i++)
 		gpio_free(mux->gpio_base + mux->data.gpios[i]);
 
-	platform_set_drvdata(pdev, NULL);
 	i2c_put_adapter(mux->parent);
 
 	return 0;