Merge branch 'devm_no_resource_check' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull devm usage cleanup from Wolfram Sang:
 "Lately, I have been experimenting how to improve the devm interface to
  make writing device drivers easier and less error prone while also
  getting rid of its subtle issues.  I think it has more potential but
  still needs work and definately conistency, especiall in its usage.

  The first thing I come up with is a low hanging fruit regarding
  devm_ioremap_resouce().  This function already checks if the passed
  resource is valid and gives an error message if not.  So, we can
  remove similar checks from the drivers and get rid of a bit of code
  and a number of inconsistent error strings.

  This series only removes the unneeded check iff devm_ioremap_resource
  follows platform_get_resource directly.  The previous version tried to
  shuffle code if needed, too, what lead to an embarrasing bug.  It
  turned out to me that shuffling code for all cases found will make the
  automated script too complex, so I am unsure if an automated cleanup
  is the proper tool for this case.  Removing the easy stuff seems
  worthwhile to me, though.

  Despite various architectures and platform dependencies, I managed to
  compile test 45 out of 57 modified files locally using heuristics and
  defconfigs."

Pulled because: 296 deletions, 0 additions.

* 'devm_no_resource_check' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (33 commits)
  sound/soc/kirkwood: don't check resource with devm_ioremap_resource
  sound/soc/fsl: don't check resource with devm_ioremap_resource
  arch/mips/lantiq/xway: don't check resource with devm_ioremap_resource
  arch/arm/plat-samsung: don't check resource with devm_ioremap_resource
  arch/arm/mach-tegra: don't check resource with devm_ioremap_resource
  drivers/watchdog: don't check resource with devm_ioremap_resource
  drivers/w1/masters: don't check resource with devm_ioremap_resource
  drivers/video/omap2/dss: don't check resource with devm_ioremap_resource
  drivers/video/omap2: don't check resource with devm_ioremap_resource
  drivers/usb/phy: don't check resource with devm_ioremap_resource
  drivers/usb/host: don't check resource with devm_ioremap_resource
  drivers/usb/gadget: don't check resource with devm_ioremap_resource
  drivers/usb/chipidea: don't check resource with devm_ioremap_resource
  drivers/thermal: don't check resource with devm_ioremap_resource
  drivers/staging/nvec: don't check resource with devm_ioremap_resource
  drivers/staging/dwc2: don't check resource with devm_ioremap_resource
  drivers/spi: don't check resource with devm_ioremap_resource
  drivers/rtc: don't check resource with devm_ioremap_resource
  drivers/pwm: don't check resource with devm_ioremap_resource
  drivers/pinctrl: don't check resource with devm_ioremap_resource
  ...

51 files changed, 0 insertions, 267 deletions

diff --git a/drivers/ata/pata_ep93xx.c b/drivers/ata/pata_ep93xx.c
index c1bfaf43d10..980b88e109f 100644
--- a/drivers/ata/pata_ep93xx.c
+++ b/drivers/ata/pata_ep93xx.c
@@ -933,11 +933,6 @@ static int ep93xx_pata_probe(struct platform_device *pdev)
 	}
 
 	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!mem_res) {
-		err = -ENXIO;
-		goto err_rel_gpio;
-	}
-
 	ide_base = devm_ioremap_resource(&pdev->dev, mem_res);
 	if (IS_ERR(ide_base)) {
 		err = PTR_ERR(ide_base);
diff --git a/drivers/char/hw_random/mxc-rnga.c b/drivers/char/hw_random/mxc-rnga.c
index 4ca35e8a5d8..19a12ac64a9 100644
--- a/drivers/char/hw_random/mxc-rnga.c
+++ b/drivers/char/hw_random/mxc-rnga.c
@@ -167,11 +167,6 @@ static int __init mxc_rnga_probe(struct platform_device *pdev)
 	clk_prepare_enable(mxc_rng->clk);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		err = -ENOENT;
-		goto err_region;
-	}
-
 	mxc_rng->mem = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(mxc_rng->mem)) {
 		err = PTR_ERR(mxc_rng->mem);
@@ -189,7 +184,6 @@ static int __init mxc_rnga_probe(struct platform_device *pdev)
 	return 0;
 
 err_ioremap:
-err_region:
 	clk_disable_unprepare(mxc_rng->clk);
 
 out:
diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index 749dc16ca2c..d2903e77227 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -119,11 +119,6 @@ static int omap_rng_probe(struct platform_device *pdev)
 	dev_set_drvdata(&pdev->dev, priv);
 
 	priv->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!priv->mem_res) {
-		ret = -ENOENT;
-		goto err_ioremap;
-	}
-
 	priv->base = devm_ioremap_resource(&pdev->dev, priv->mem_res);
 	if (IS_ERR(priv->base)) {
 		ret = PTR_ERR(priv->base);
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index ce193409ebd..33f59ecd256 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -1273,11 +1273,6 @@ static int tegra_dma_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, tdma);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "No mem resource for DMA\n");
-		return -EINVAL;
-	}
-
 	tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(tdma->base_addr))
 		return PTR_ERR(tdma->base_addr);
diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index bf69a7eff37..3a4816adc13 100644
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -619,11 +619,6 @@ static int mvebu_gpio_probe(struct platform_device *pdev)
 	 * per-CPU registers */
 	if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
 		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-		if (!res) {
-			dev_err(&pdev->dev, "Cannot get memory resource\n");
-			return -ENODEV;
-		}
-
 		mvchip->percpu_membase = devm_ioremap_resource(&pdev->dev,
 							       res);
 		if (IS_ERR(mvchip->percpu_membase))
diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index da4cb5b0cb8..9a62672f1be 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -463,11 +463,6 @@ static int tegra_gpio_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "Missing MEM resource\n");
-		return -ENODEV;
-	}
-
 	regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index bbfc3840080..6652597586a 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -2005,11 +2005,6 @@ static int hdmi_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		DRM_ERROR("failed to find registers\n");
-		return -ENOENT;
-	}
-
 	hdata->regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(hdata->regs))
 		return PTR_ERR(hdata->regs);
diff --git a/drivers/gpu/host1x/drm/dc.c b/drivers/gpu/host1x/drm/dc.c
index 1e2060324f0..8c04943f82e 100644
--- a/drivers/gpu/host1x/drm/dc.c
+++ b/drivers/gpu/host1x/drm/dc.c
@@ -1128,11 +1128,6 @@ static int tegra_dc_probe(struct platform_device *pdev)
 		return err;
 
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!regs) {
-		dev_err(&pdev->dev, "failed to get registers\n");
-		return -ENXIO;
-	}
-
 	dc->regs = devm_ioremap_resource(&pdev->dev, regs);
 	if (IS_ERR(dc->regs))
 		return PTR_ERR(dc->regs);
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 6e8ee92ab55..cab1c91b75a 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -1082,11 +1082,6 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	/* map the registers */
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (res == NULL) {
-		dev_err(&pdev->dev, "cannot find IO resource\n");
-		return -ENOENT;
-	}
-
 	i2c->regs = devm_ioremap_resource(&pdev->dev, res);
 
 	if (IS_ERR(i2c->regs))
diff --git a/drivers/i2c/busses/i2c-sirf.c b/drivers/i2c/busses/i2c-sirf.c
index 5a7ad240bd2..a63c7d50683 100644
--- a/drivers/i2c/busses/i2c-sirf.c
+++ b/drivers/i2c/busses/i2c-sirf.c
@@ -303,12 +303,6 @@ static int i2c_sirfsoc_probe(struct platform_device *pdev)
 	adap->class = I2C_CLASS_HWMON;
 
 	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (mem_res == NULL) {
-		dev_err(&pdev->dev, "Unable to get MEM resource\n");
-		err = -EINVAL;
-		goto out;
-	}
-
 	siic->base = devm_ioremap_resource(&pdev->dev, mem_res);
 	if (IS_ERR(siic->base)) {
 		err = PTR_ERR(siic->base);
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index b60ff90adc3..9aa1b60f7fd 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -714,11 +714,6 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	int ret = 0;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no mem resource\n");
-		return -EINVAL;
-	}
-
 	base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(base))
 		return PTR_ERR(base);
diff --git a/drivers/memory/emif.c b/drivers/memory/emif.c
index cadf1cc19aa..04644e7b42b 100644
--- a/drivers/memory/emif.c
+++ b/drivers/memory/emif.c
@@ -1560,12 +1560,6 @@ static int __init_or_module emif_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, emif);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(emif->dev, "%s: error getting memory resource\n",
-			__func__);
-		goto error;
-	}
-
 	emif->base = devm_ioremap_resource(emif->dev, res);
 	if (IS_ERR(emif->base))
 		goto error;
diff --git a/drivers/mfd/intel_msic.c b/drivers/mfd/intel_msic.c
index 5be3b5e1385..d8d5137f971 100644
--- a/drivers/mfd/intel_msic.c
+++ b/drivers/mfd/intel_msic.c
@@ -414,11 +414,6 @@ static int intel_msic_probe(struct platform_device *pdev)
 	 * the clients via intel_msic_irq_read().
 	 */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "failed to get SRAM iomem resource\n");
-		return -ENODEV;
-	}
-
 	msic->irq_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(msic->irq_base))
 		return PTR_ERR(msic->irq_base);
diff --git a/drivers/misc/atmel-ssc.c b/drivers/misc/atmel-ssc.c
index c09c28f9205..1abd5ad5992 100644
--- a/drivers/misc/atmel-ssc.c
+++ b/drivers/misc/atmel-ssc.c
@@ -154,11 +154,6 @@ static int ssc_probe(struct platform_device *pdev)
 	ssc->pdata = (struct atmel_ssc_platform_data *)plat_dat;
 
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!regs) {
-		dev_dbg(&pdev->dev, "no mmio resource defined\n");
-		return -ENXIO;
-	}
-
 	ssc->regs = devm_ioremap_resource(&pdev->dev, regs);
 	if (IS_ERR(ssc->regs))
 		return PTR_ERR(ssc->regs);
diff --git a/drivers/mtd/nand/lpc32xx_mlc.c b/drivers/mtd/nand/lpc32xx_mlc.c
index a94facb46e5..fd1df5e13ae 100644
--- a/drivers/mtd/nand/lpc32xx_mlc.c
+++ b/drivers/mtd/nand/lpc32xx_mlc.c
@@ -672,11 +672,6 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	}
 
 	rc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (rc == NULL) {
-		dev_err(&pdev->dev, "No memory resource found for device!\r\n");
-		return -ENXIO;
-	}
-
 	host->io_base = devm_ioremap_resource(&pdev->dev, rc);
 	if (IS_ERR(host->io_base))
 		return PTR_ERR(host->io_base);
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 33dc6f2418f..42e9dd05c93 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -2745,11 +2745,6 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
 	if (mdp->cd->tsu) {
 		struct resource *rtsu;
 		rtsu = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-		if (!rtsu) {
-			dev_err(&pdev->dev, "Not found TSU resource\n");
-			ret = -ENODEV;
-			goto out_release;
-		}
 		mdp->tsu_addr = devm_ioremap_resource(&pdev->dev, rtsu);
 		if (IS_ERR(mdp->tsu_addr)) {
 			ret = PTR_ERR(mdp->tsu_addr);
diff --git a/drivers/pinctrl/pinctrl-coh901.c b/drivers/pinctrl/pinctrl-coh901.c
index edde3acc418..a67af419f53 100644
--- a/drivers/pinctrl/pinctrl-coh901.c
+++ b/drivers/pinctrl/pinctrl-coh901.c
@@ -713,11 +713,6 @@ static int __init u300_gpio_probe(struct platform_device *pdev)
 	gpio->dev = &pdev->dev;
 
 	memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!memres) {
-		dev_err(gpio->dev, "could not get GPIO memory resource\n");
-		return -ENODEV;
-	}
-
 	gpio->base = devm_ioremap_resource(&pdev->dev, memres);
 	if (IS_ERR(gpio->base))
 		return PTR_ERR(gpio->base);
diff --git a/drivers/pinctrl/pinctrl-exynos5440.c b/drivers/pinctrl/pinctrl-exynos5440.c
index 6038503ed92..32a48f44f57 100644
--- a/drivers/pinctrl/pinctrl-exynos5440.c
+++ b/drivers/pinctrl/pinctrl-exynos5440.c
@@ -1000,11 +1000,6 @@ static int exynos5440_pinctrl_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(dev, "cannot find IO resource\n");
-		return -ENOENT;
-	}
-
 	priv->reg_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(priv->reg_base))
 		return PTR_ERR(priv->reg_base);
diff --git a/drivers/pinctrl/pinctrl-samsung.c b/drivers/pinctrl/pinctrl-samsung.c
index 976366899f6..055d0162098 100644
--- a/drivers/pinctrl/pinctrl-samsung.c
+++ b/drivers/pinctrl/pinctrl-samsung.c
@@ -932,11 +932,6 @@ static int samsung_pinctrl_probe(struct platform_device *pdev)
 	drvdata->dev = dev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(dev, "cannot find IO resource\n");
-		return -ENOENT;
-	}
-
 	drvdata->virt_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(drvdata->virt_base))
 		return PTR_ERR(drvdata->virt_base);
diff --git a/drivers/pinctrl/pinctrl-xway.c b/drivers/pinctrl/pinctrl-xway.c
index f2977cff836..e92132c76a6 100644
--- a/drivers/pinctrl/pinctrl-xway.c
+++ b/drivers/pinctrl/pinctrl-xway.c
@@ -716,10 +716,6 @@ static int pinmux_xway_probe(struct platform_device *pdev)
 
 	/* get and remap our register range */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "Failed to get resource\n");
-		return -ENOENT;
-	}
 	xway_info.membase[0] = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(xway_info.membase[0]))
 		return PTR_ERR(xway_info.membase[0]);
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
index ec287989eaf..c938bae1881 100644
--- a/drivers/pwm/pwm-imx.c
+++ b/drivers/pwm/pwm-imx.c
@@ -265,11 +265,6 @@ static int imx_pwm_probe(struct platform_device *pdev)
 	imx->chip.npwm = 1;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (r == NULL) {
-		dev_err(&pdev->dev, "no memory resource defined\n");
-		return -ENODEV;
-	}
-
 	imx->mmio_base = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(imx->mmio_base))
 		return PTR_ERR(imx->mmio_base);
diff --git a/drivers/pwm/pwm-puv3.c b/drivers/pwm/pwm-puv3.c
index d1eb499fb15..ed6007b2758 100644
--- a/drivers/pwm/pwm-puv3.c
+++ b/drivers/pwm/pwm-puv3.c
@@ -117,11 +117,6 @@ static int pwm_probe(struct platform_device *pdev)
 		return PTR_ERR(puv3->clk);
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (r == NULL) {
-		dev_err(&pdev->dev, "no memory resource defined\n");
-		return -ENODEV;
-	}
-
 	puv3->base = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(puv3->base))
 		return PTR_ERR(puv3->base);
diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index dee6ab552a0..dc9717551d3 100644
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -147,11 +147,6 @@ static int pwm_probe(struct platform_device *pdev)
 	pwm->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (r == NULL) {
-		dev_err(&pdev->dev, "no memory resource defined\n");
-		return -ENODEV;
-	}
-
 	pwm->mmio_base = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(pwm->mmio_base))
 		return PTR_ERR(pwm->mmio_base);
diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c
index 3d75f4a88f9..a5402933001 100644
--- a/drivers/pwm/pwm-tegra.c
+++ b/drivers/pwm/pwm-tegra.c
@@ -181,11 +181,6 @@ static int tegra_pwm_probe(struct platform_device *pdev)
 	pwm->dev = &pdev->dev;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!r) {
-		dev_err(&pdev->dev, "no memory resources defined\n");
-		return -ENODEV;
-	}
-
 	pwm->mmio_base = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(pwm->mmio_base))
 		return PTR_ERR(pwm->mmio_base);
diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index 0d65fb2e02c..72ca42dfa73 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -240,11 +240,6 @@ static int ecap_pwm_probe(struct platform_device *pdev)
 	pc->chip.npwm = 1;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!r) {
-		dev_err(&pdev->dev, "no memory resource defined\n");
-		return -ENODEV;
-	}
-
 	pc->mmio_base = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(pc->mmio_base))
 		return PTR_ERR(pc->mmio_base);
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index 6a217596942..48a485c2e42 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -471,11 +471,6 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
 	pc->chip.npwm = NUM_PWM_CHANNEL;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!r) {
-		dev_err(&pdev->dev, "no memory resource defined\n");
-		return -ENODEV;
-	}
-
 	pc->mmio_base = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(pc->mmio_base))
 		return PTR_ERR(pc->mmio_base);
diff --git a/drivers/pwm/pwm-tipwmss.c b/drivers/pwm/pwm-tipwmss.c
index c9c3d3a1e0e..3b119bc2c3c 100644
--- a/drivers/pwm/pwm-tipwmss.c
+++ b/drivers/pwm/pwm-tipwmss.c
@@ -70,11 +70,6 @@ static int pwmss_probe(struct platform_device *pdev)
 	mutex_init(&info->pwmss_lock);
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!r) {
-		dev_err(&pdev->dev, "no memory resource defined\n");
-		return -ENODEV;
-	}
-
 	info->mmio_base = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(info->mmio_base))
 		return PTR_ERR(info->mmio_base);
diff --git a/drivers/pwm/pwm-vt8500.c b/drivers/pwm/pwm-vt8500.c
index 69effd19afc..323125abf3f 100644
--- a/drivers/pwm/pwm-vt8500.c
+++ b/drivers/pwm/pwm-vt8500.c
@@ -230,11 +230,6 @@ static int vt8500_pwm_probe(struct platform_device *pdev)
 	}
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (r == NULL) {
-		dev_err(&pdev->dev, "no memory resource defined\n");
-		return -ENODEV;
-	}
-
 	chip->base = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(chip->base))
 		return PTR_ERR(chip->base);
diff --git a/drivers/rtc/rtc-nuc900.c b/drivers/rtc/rtc-nuc900.c
index f5dfb6e5e7d..d592e2fe43f 100644
--- a/drivers/rtc/rtc-nuc900.c
+++ b/drivers/rtc/rtc-nuc900.c
@@ -234,11 +234,6 @@ static int __init nuc900_rtc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "platform_get_resource failed\n");
-		return -ENXIO;
-	}
-
 	nuc900_rtc->rtc_reg = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(nuc900_rtc->rtc_reg))
 		return PTR_ERR(nuc900_rtc->rtc_reg);
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index 4e1bdb832e3..b0ba3fc991e 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -347,11 +347,6 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		pr_debug("%s: RTC resource data missing\n", pdev->name);
-		return -ENOENT;
-	}
-
 	rtc_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(rtc_base))
 		return PTR_ERR(rtc_base);
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 14040b22888..0b495e8b8e6 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -477,11 +477,6 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 	/* get the memory region */
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (res == NULL) {
-		dev_err(&pdev->dev, "failed to get memory region resource\n");
-		return -ENOENT;
-	}
-
 	s3c_rtc_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(s3c_rtc_base))
 		return PTR_ERR(s3c_r