usb: phy: fix return value check of usb_get_phy

usb_get_phy will return -ENODEV if it's not able to find the phy. Hence
fixed all the callers of usb_get_phy to check for this error condition
instead of relying on a non-zero value as success condition.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

25 files changed, 96 insertions, 77 deletions

diff --git a/drivers/power/ab8500_charger.c b/drivers/power/ab8500_charger.c
index 6bd6f1c41967..d4f0c98428cb 100644
--- a/drivers/power/ab8500_charger.c
+++ b/drivers/power/ab8500_charger.c
@@ -2689,7 +2689,7 @@ static int __devinit ab8500_charger_probe(struct platform_device *pdev)
         }
 
         di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (!di->usb_phy) {
+        if (IS_ERR_OR_NULL(di->usb_phy)) {
                 dev_err(di->dev, "failed to get usb transceiver\n");
                 ret = -EINVAL;
                 goto free_usb;
diff --git a/drivers/power/isp1704_charger.c b/drivers/power/isp1704_charger.c
index 090e5f9e72c9..122911978da2 100644
--- a/drivers/power/isp1704_charger.c
+++ b/drivers/power/isp1704_charger.c
@@ -416,7 +416,7 @@ static int __devinit isp1704_charger_probe(struct platform_device *pdev)
                 return -ENOMEM;
 
         isp->phy = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (!isp->phy)
+        if (IS_ERR_OR_NULL(isp->phy))
                 goto fail0;
 
         isp->dev = &pdev->dev;
diff --git a/drivers/power/pda_power.c b/drivers/power/pda_power.c
index 7602d49e4d81..8dbcd53c5e67 100644
--- a/drivers/power/pda_power.c
+++ b/drivers/power/pda_power.c
@@ -322,11 +322,11 @@ static int pda_power_probe(struct platform_device *pdev)
 
 #ifdef CONFIG_USB_OTG_UTILS
         transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (transceiver && !pdata->is_usb_online) {
-                pdata->is_usb_online = otg_is_usb_online;
-        }
-        if (transceiver && !pdata->is_ac_online) {
-                pdata->is_ac_online = otg_is_ac_online;
+        if (!IS_ERR_OR_NULL(transceiver)) {
+                if (!pdata->is_usb_online)
+                        pdata->is_usb_online = otg_is_usb_online;
+                if (!pdata->is_ac_online)
+                        pdata->is_ac_online = otg_is_ac_online;
         }
 #endif
 
@@ -373,7 +373,7 @@ static int pda_power_probe(struct platform_device *pdev)
         }
 
 #ifdef CONFIG_USB_OTG_UTILS
-        if (transceiver && pdata->use_otg_notifier) {
+        if (!IS_ERR_OR_NULL(transceiver) && pdata->use_otg_notifier) {
                 otg_nb.notifier_call = otg_handle_notification;
                 ret = usb_register_notifier(transceiver, &otg_nb);
                 if (ret) {
@@ -408,7 +408,7 @@ usb_supply_failed:
         if (pdata->is_ac_online && ac_irq)
                 free_irq(ac_irq->start, &pda_psy_ac);
 #ifdef CONFIG_USB_OTG_UTILS
-        if (transceiver)
+        if (!IS_ERR_OR_NULL(transceiver))
                 usb_put_phy(transceiver);
 #endif
 ac_irq_failed:
@@ -443,7 +443,7 @@ static int pda_power_remove(struct platform_device *pdev)
         if (pdata->is_ac_online)
                 power_supply_unregister(&pda_psy_ac);
 #ifdef CONFIG_USB_OTG_UTILS
-        if (transceiver)
+        if (!IS_ERR_OR_NULL(transceiver))
                 usb_put_phy(transceiver);
 #endif
         if (ac_draw) {
diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index 13f9db2e8538..7cacbaa68efe 100644
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/i2c/twl.h>
@@ -480,7 +481,7 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
         INIT_WORK(&bci->work, twl4030_bci_usb_work);
 
         bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (bci->transceiver != NULL) {
+        if (!IS_ERR_OR_NULL(bci->transceiver)) {
                 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
                 usb_register_notifier(bci->transceiver, &bci->usb_nb);
         }
@@ -507,7 +508,7 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
         return 0;
 
 fail_unmask_interrupts:
-        if (bci->transceiver != NULL) {
+        if (!IS_ERR_OR_NULL(bci->transceiver)) {
                 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
                 usb_put_phy(bci->transceiver);
         }
@@ -538,7 +539,7 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev)
         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
                          TWL4030_INTERRUPTS_BCIIMR2A);
 
-        if (bci->transceiver != NULL) {
+        if (!IS_ERR_OR_NULL(bci->transceiver)) {
                 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
                 usb_put_phy(bci->transceiver);
         }
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index a06d28b119f5..4688ab71bd27 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -14,6 +14,7 @@
 #include <linux/device.h>
 #include <linux/dmapool.h>
 #include <linux/dma-mapping.h>
+#include <linux/err.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/module.h>
@@ -1712,7 +1713,7 @@ static int udc_start(struct ci13xxx *udc)
         if (retval)
                 goto unreg_device;
 
-        if (udc->transceiver) {
+        if (!IS_ERR_OR_NULL(udc->transceiver)) {
                 retval = otg_set_peripheral(udc->transceiver->otg,
                                                 &udc->gadget);
                 if (retval)
@@ -1729,7 +1730,7 @@ static int udc_start(struct ci13xxx *udc)
         return retval;
 
 remove_trans:
-        if (udc->transceiver) {
+        if (!IS_ERR_OR_NULL(udc->transceiver)) {
                 otg_set_peripheral(udc->transceiver->otg, &udc->gadget);
                 usb_put_phy(udc->transceiver);
         }
@@ -1740,7 +1741,7 @@ remove_dbg:
 unreg_device:
         device_unregister(&udc->gadget.dev);
 put_transceiver:
-        if (udc->transceiver)
+        if (!IS_ERR_OR_NULL(udc->transceiver))
                 usb_put_phy(udc->transceiver);
 free_pools:
         dma_pool_destroy(udc->td_pool);
@@ -1772,7 +1773,7 @@ static void udc_stop(struct ci13xxx *udc)
         dma_pool_destroy(udc->td_pool);
         dma_pool_destroy(udc->qh_pool);
 
-        if (udc->transceiver) {
+        if (!IS_ERR_OR_NULL(udc->transceiver)) {
                 otg_set_peripheral(udc->transceiver->otg, NULL);
                 usb_put_phy(udc->transceiver);
         }
diff --git a/drivers/usb/gadget/fsl_udc_core.c b/drivers/usb/gadget/fsl_udc_core.c
index 0808820ba495..8d8fca635cc7 100644
--- a/drivers/usb/gadget/fsl_udc_core.c
+++ b/drivers/usb/gadget/fsl_udc_core.c
@@ -24,6 +24,7 @@
 #include <linux/ioport.h>
 #include <linux/types.h>
 #include <linux/errno.h>
+#include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/list.h>
@@ -1229,7 +1230,7 @@ static int fsl_vbus_draw(struct usb_gadget *gadget, unsigned mA)
         struct fsl_udc *udc;
 
         udc = container_of(gadget, struct fsl_udc, gadget);
-        if (udc->transceiver)
+        if (!IS_ERR_OR_NULL(udc->transceiver))
                 return usb_phy_set_power(udc->transceiver, mA);
         return -ENOTSUPP;
 }
@@ -1983,13 +1984,13 @@ static int fsl_start(struct usb_gadget_driver *driver,
                 goto out;
         }
 
-        if (udc_controller->transceiver) {
+        if (!IS_ERR_OR_NULL(udc_controller->transceiver)) {
                 /* Suspend the controller until OTG enable it */
                 udc_controller->stopped = 1;
                 printk(KERN_INFO "Suspend udc for OTG auto detect\n");
 
                 /* connect to bus through transceiver */
-                if (udc_controller->transceiver) {
+                if (!IS_ERR_OR_NULL(udc_controller->transceiver)) {
                         retval = otg_set_peripheral(
                                         udc_controller->transceiver->otg,
                                                     &udc_controller->gadget);
@@ -2030,7 +2031,7 @@ static int fsl_stop(struct usb_gadget_driver *driver)
         if (!driver || driver != udc_controller->driver || !driver->unbind)
                 return -EINVAL;
 
-        if (udc_controller->transceiver)
+        if (!IS_ERR_OR_NULL(udc_controller->transceiver))
                 otg_set_peripheral(udc_controller->transceiver->otg, NULL);
 
         /* stop DR, disable intr */
@@ -2456,7 +2457,7 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
 #ifdef CONFIG_USB_OTG
         if (pdata->operating_mode == FSL_USB2_DR_OTG) {
                 udc_controller->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
-                if (!udc_controller->transceiver) {
+                if (IS_ERR_OR_NULL(udc_controller->transceiver)) {
                         ERR("Can't find OTG driver!\n");
                         ret = -ENODEV;
                         goto err_kfree;
@@ -2540,7 +2541,7 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
                 goto err_free_irq;
         }
 
-        if (!udc_controller->transceiver) {
+        if (IS_ERR_OR_NULL(udc_controller->transceiver)) {
                 /* initialize usb hw reg except for regs for EP,
                  * leave usbintr reg untouched */
                 dr_controller_setup(udc_controller);
@@ -2564,7 +2565,7 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
         if (ret < 0)
                 goto err_free_irq;
 
-        if (udc_controller->transceiver)
+        if (!IS_ERR_OR_NULL(udc_controller->transceiver))
                 udc_controller->gadget.is_otg = 1;
 
         /* setup QH and epctrl for ep0 */
diff --git a/drivers/usb/gadget/mv_udc_core.c b/drivers/usb/gadget/mv_udc_core.c
index 75ff41a5c959..9305de41af28 100644
--- a/drivers/usb/gadget/mv_udc_core.c
+++ b/drivers/usb/gadget/mv_udc_core.c
@@ -19,6 +19,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
+#include <linux/err.h>
 #include <linux/init.h>
 #include <linux/timer.h>
 #include <linux/list.h>
@@ -1381,7 +1382,7 @@ static int mv_udc_start(struct usb_gadget_driver *driver,
                 return retval;
         }
 
-        if (udc->transceiver) {
+        if (!IS_ERR_OR_NULL(udc->transceiver)) {
                 retval = otg_set_peripheral(udc->transceiver->otg,
                                         &udc->gadget);
                 if (retval) {
@@ -2107,7 +2108,7 @@ static int __devexit mv_udc_remove(struct platform_device *dev)
          * then vbus irq will not be requested in udc driver.
          */
         if (udc->pdata && udc->pdata->vbus
-                && udc->clock_gating && udc->transceiver == NULL)
+                && udc->clock_gating && IS_ERR_OR_NULL(udc->transceiver))
                 free_irq(udc->pdata->vbus->irq, &dev->dev);
 
         /* free memory allocated in probe */
@@ -2325,7 +2326,7 @@ static int __devinit mv_udc_probe(struct platform_device *dev)
         eps_init(udc);
 
         /* VBUS detect: we can disable/enable clock on demand.*/
-        if (udc->transceiver)
+        if (!IS_ERR_OR_NULL(udc->transceiver))
                 udc->clock_gating = 1;
         else if (pdata->vbus) {
                 udc->clock_gating = 1;
@@ -2369,7 +2370,7 @@ static int __devinit mv_udc_probe(struct platform_device *dev)
 
 err_unregister:
         if (udc->pdata && udc->pdata->vbus
-                && udc->clock_gating && udc->transceiver == NULL)
+                && udc->clock_gating && IS_ERR_OR_NULL(udc->transceiver))
                 free_irq(pdata->vbus->irq, &dev->dev);
         device_unregister(&udc->gadget.dev);
 err_free_irq:
@@ -2404,7 +2405,7 @@ static int mv_udc_suspend(struct device *_dev)
         struct mv_udc *udc = the_controller;
 
         /* if OTG is enabled, the following will be done in OTG driver*/
-        if (udc->transceiver)
+        if (!IS_ERR_OR_NULL(udc->transceiver))
                 return 0;
 
         if (udc->pdata->vbus && udc->pdata->vbus->poll)
@@ -2437,7 +2438,7 @@ static int mv_udc_resume(struct device *_dev)
         int retval;
 
         /* if OTG is enabled, the following will be done in OTG driver*/
-        if (udc->transceiver)
+        if (!IS_ERR_OR_NULL(udc->transceiver))
                 return 0;
 
         if (!udc->clock_gating) {
diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index cf8bf26f12ed..7b71295adf6f 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -35,6 +35,7 @@
 #include <linux/usb/otg.h>
 #include <linux/dma-mapping.h>
 #include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/prefetch.h>
 
 #include <asm/byteorder.h>
@@ -1211,7 +1212,7 @@ static int omap_wakeup(struct usb_gadget *gadget)
 
         /* NOTE:  non-OTG systems may use SRP TOO... */
         } else if (!(udc->devstat & UDC_ATT)) {
-                if (udc->transceiver)
+                if (!IS_ERR_OR_NULL(udc->transceiver))
                         retval = otg_start_srp(udc->transceiver->otg);
         }
         spin_unlock_irqrestore(&udc->lock, flags);
@@ -1343,7 +1344,7 @@ static int omap_vbus_draw(struct usb_gadget *gadget, unsigned mA)
         struct omap_udc *udc;
 
         udc = container_of(gadget, struct omap_udc, gadget);
-        if (udc->transceiver)
+        if (!IS_ERR_OR_NULL(udc->transceiver))
                 return usb_phy_set_power(udc->transceiver, mA);
         return -EOPNOTSUPP;
 }
@@ -1792,12 +1793,12 @@ static void devstate_irq(struct omap_udc *udc, u16 irq_src)
                         if (devstat & UDC_ATT) {
                                 udc->gadget.speed = USB_SPEED_FULL;
                                 VDBG("connect\n");
-                                if (!udc->transceiver)
+                                if (IS_ERR_OR_NULL(udc->transceiver))
                                         pullup_enable(udc);
                                 // if (driver->connect) call it
                         } else if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
                                 udc->gadget.speed = USB_SPEED_UNKNOWN;
-                                if (!udc->transceiver)
+                                if (IS_ERR_OR_NULL(udc->transceiver))
                                         pullup_disable(udc);
                                 DBG("disconnect, gadget %s\n",
                                         udc->driver->driver.name);
@@ -1837,12 +1838,12 @@ static void devstate_irq(struct omap_udc *udc, u16 irq_src)
                                         udc->driver->suspend(&udc->gadget);
                                         spin_lock(&udc->lock);
                                 }
-                                if (udc->transceiver)
+                                if (!IS_ERR_OR_NULL(udc->transceiver))
                                         usb_phy_set_suspend(
                                                         udc->transceiver, 1);
                         } else {
                                 VDBG("resume\n");
-                                if (udc->transceiver)
+                                if (!IS_ERR_OR_NULL(udc->transceiver))
                                         usb_phy_set_suspend(
                                                         udc->transceiver, 0);
                                 if (udc->gadget.speed == USB_SPEED_FULL
@@ -2154,7 +2155,7 @@ static int omap_udc_start(struct usb_gadget_driver *driver,
         omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
 
         /* connect to bus through transceiver */
-        if (udc->transceiver) {
+        if (!IS_ERR_OR_NULL(udc->transceiver)) {
                 status = otg_set_peripheral(udc->transceiver->otg,
                                                 &udc->gadget);
                 if (status < 0) {
@@ -2201,7 +2202,7 @@ static int omap_udc_stop(struct usb_gadget_driver *driver)
         if (machine_without_vbus_sense())
                 omap_vbus_session(&udc->gadget, 0);
 
-        if (udc->transceiver)
+        if (!IS_ERR_OR_NULL(udc->transceiver))
                 (void) otg_set_peripheral(udc->transceiver->otg, NULL);
         else
                 pullup_disable(udc);
@@ -2866,7 +2867,7 @@ static int __init omap_udc_probe(struct platform_device *pdev)
                  * but not having one probably means no VBUS detection.
                  */
                 xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
-                if (xceiv)
+                if (!IS_ERR_OR_NULL(xceiv))
                         type = xceiv->label;
                 else if (config->otg) {
                         DBG("OTG requires external transceiver!\n");
@@ -2898,7 +2899,7 @@ static int __init omap_udc_probe(struct platform_device *pdev)
                 case 16:
                 case 19:
                 case 25:
-                        if (!xceiv) {
+                        if (IS_ERR_OR_NULL(xceiv)) {
                                 DBG("external transceiver not registered!\n");
                                 type = "unknown";
                         }
@@ -3010,7 +3011,7 @@ cleanup1:
         udc = NULL;
 
 cleanup0:
-        if (xceiv)
+        if (!IS_ERR_OR_NULL(xceiv))
                 usb_put_phy(xceiv);
 
         if (cpu_is_omap16xx() || cpu_is_omap24xx() || cpu_is_omap7xx()) {
@@ -3040,7 +3041,7 @@ static int __exit omap_udc_remove(struct platform_device *pdev)
         udc->done = &done;
 
         pullup_disable(udc);
-        if (udc->transceiver) {
+        if (!IS_ERR_OR_NULL(udc->transceiver)) {
                 usb_put_phy(udc->transceiver);
                 udc->transceiver = NULL;
         }
diff --git a/drivers/usb/gadget/pxa25x_udc.c b/drivers/usb/gadget/pxa25x_udc.c
index cc0b1e63dcab..fa8e93c2465f 100644
--- a/drivers/usb/gadget/pxa25x_udc.c
+++ b/drivers/usb/gadget/pxa25x_udc.c
@@ -21,6 +21,7 @@
 #include <linux/ioport.h>
 #include <linux/types.h>
 #include <linux/errno.h>
+#include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/init.h>
@@ -993,7 +994,7 @@ static int pxa25x_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
 
         udc = container_of(_gadget, struct pxa25x_udc, gadget);
 
-        if (udc->transceiver)
+        if (!IS_ERR_OR_NULL(udc->transceiver))
                 return usb_phy_set_power(udc->transceiver, mA);
         return -EOPNOTSUPP;
 }
@@ -1299,7 +1300,7 @@ fail:
         DMSG("registered gadget driver '%s'\n", driver->driver.name);
 
         /* connect to bus through transceiver */
-        if (dev->transceiver) {
+        if (!IS_ERR_OR_NULL(dev->transceiver)) {
                 retval = otg_set_peripheral(dev->transceiver->otg,
                                                 &dev->gadget);
                 if (retval) {
@@ -1359,7 +1360,7 @@ static int pxa25x_stop(struct usb_gadget_driver *driver)
         stop_activity(dev, driver);
         local_irq_enable();
 
-        if (dev->transceiver)
+        if (!IS_ERR_OR_NULL(dev->transceiver))
                 (void) otg_set_peripheral(dev->transceiver->otg, NULL);
 
         driver->unbind(&dev->gadget);
@@ -2237,7 +2238,7 @@ lubbock_fail0:
         if (gpio_is_valid(dev->mach->gpio_pullup))
                 gpio_free(dev->mach->gpio_pullup);
  err_gpio_pullup:
-        if (dev->transceiver) {
+        if (!IS_ERR_OR_NULL(dev->transceiver)) {
                 usb_put_phy(dev->transceiver);
                 dev->transceiver = NULL;
         }
@@ -2279,7 +2280,7 @@ static int __exit pxa25x_udc_remove(struct platform_device *pdev)
 
         clk_put(dev->clk);
 
-        if (dev->transceiver) {
+        if (!IS_ERR_OR_NULL(dev->transceiver)) {
                 usb_put_phy(dev->transceiver);
                 dev->transceiver = NULL;
         }
diff --git a/drivers/usb/gadget/pxa27x_udc.c b/drivers/usb/gadget/pxa27x_udc.c
index 8f744aab9628..644b4305cb99 100644
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -13,6 +13,7 @@
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/errno.h>
+#include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/delay.h>
 #include <linux/list.h>
@@ -1573,7 +1574,7 @@ static int should_enable_udc(struct pxa_udc *udc)
         int put_on;
 
         put_on = ((udc->pullup_on) && (udc->driver));
-        put_on &= ((udc->vbus_sensed) || (!udc->transceiver));
+        put_on &= ((udc->vbus_sensed) || (IS_ERR_OR_NULL(udc->transceiver)));
         return put_on;
 }
 
@@ -1594,7 +1595,7 @@ static int should_disable_udc(struct pxa_udc *udc)
         int put_off;
 
         put_off = ((!udc->pullup_on) || (!udc->driver));
-        put_off |= ((!udc->vbus_sensed) && (udc->transceiver));
+        put_off |= ((!udc->vbus_sensed) && (!IS_ERR_OR_NULL(udc->transceiver)));
         return put_off;
 }
 
@@ -1665,7 +1666,7 @@ static int pxa_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
         struct pxa_udc *udc;
 
         udc = to_gadget_udc(_gadget);
-        if (udc->transceiver)
+        if (!IS_ERR_OR_NULL(udc->transceiver))
                 return usb_phy_set_power(udc->transceiver, mA);
         return -EOPNOTSUPP;
 }
@@ -1834,7 +1835,7 @@ static int pxa27x_udc_start(struct usb_gadget_driver *driver,
         dev_dbg(udc->dev, "registered gadget driver '%s'\n",
                 driver->driver.name);
 
-        if (udc->transceiver) {
+        if (!IS_ERR_OR_NULL(udc->transceiver)) {
                 retval = otg_set_peripheral(udc->transceiver->otg,
                                                 &udc->gadget);
                 if (retval) {
@@ -1908,7 +1909,7 @@ static int pxa27x_udc_stop(struct usb_gadget_driver *driver)
         dev_info(udc->dev, "unregistered gadget driver '%s'\n",
                  driver->driver.name);
 
-        if (udc->transceiver)
+        if (!IS_ERR_OR_NULL(udc->transceiver))
                 return otg_set_peripheral(udc->transceiver->otg, NULL);
         return 0;
 }
diff --git a/drivers/usb/gadget/s3c-hsudc.c b/drivers/usb/gadget/s3c-hsudc.c
index 22326f274466..7c915625f240 100644
--- a/drivers/usb/gadget/s3c-hsudc.c
+++ b/drivers/usb/gadget/s3c-hsudc.c
@@ -24,6 +24,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/usb/otg.h>
@@ -1165,7 +1166,7 @@ static int s3c_hsudc_start(struct usb_gadget *gadget,
         }
 
         /* connect to bus through transceiver */
-        if (hsudc->transceiver) {
+        if (!IS_ERR_OR_NULL(hsudc->transceiver)) {
                 ret = otg_set_peripheral(hsudc->transceiver->otg,
                                         &hsudc->gadget);
                 if (ret) {
@@ -1220,7 +1221,7 @@ static int s3c_hsudc_stop(struct usb_gadget *gadget,
         s3c_hsudc_stop_activity(hsudc);
         spin_unlock_irqrestore(&hsudc->lock, flags);
 
-        if (hsudc->transceiver)
+        if (!IS_ERR_OR_NULL(hsudc->transceiver))
                 (void) otg_set_peripheral(hsudc->transceiver->otg, NULL);
 
         disable_irq(hsudc->irq);
@@ -1249,7 +1250,7 @@ static int s3c_hsudc_vbus_draw(struct usb_gadget *gadget, unsigned mA)
         if (!hsudc)
                 return -ENODEV;
 
-        if (hsudc->transceiver)
+        if (!IS_ERR_OR_NULL(hsudc->transceiver))
                 return usb_phy_set_power(hsudc->transceiver, mA);
 
         return -EOPNOTSUPP;
@@ -1385,7 +1386,7 @@ err_irq:
 err_remap:
         release_mem_region(res->start, resource_size(res));
 err_res:
-        if (hsudc->transceiver)
+        if (!IS_ERR_OR_NULL(hsudc->transceiver))
                 usb_put_phy(hsudc->transceiver);
 
         regulator_bulk_free(ARRAY_SIZE(hsudc->supplies), hsudc->supplies);
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index ba290589d858..32865a7145a8 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -27,6 +27,7 @@
 #include <linux/types.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
+#include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/fsl_devices.h>
 
@@ -146,7 +147,7 @@ static int usb_hcd_fsl_probe(const struct hc_driver *driver,
                 dev_dbg(&pdev->dev, "hcd=0x%p  ehci=0x%p, transceiver=0x%p\n",
                         hcd, ehci, ehci->transceiver);
 
-                if (ehci->transceiver) {
+                if (!IS_ERR_OR_NULL(ehci->transceiver)) {
                         retval = otg_set_host(ehci->transceiver->otg,
                                               &ehci_to_hcd(ehci)->self);
                         if (retval) {
@@ -192,7 +193,7 @@ static void usb_hcd_fsl_remove(struct usb_hcd *hcd,
         struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 
-        if (ehci->transceiver) {
+        if (!IS_ERR_OR_NULL(ehci->transceiver)) {
                 otg_set_host(ehci->transceiver->otg, NULL);
                 usb_put_phy(ehci->transceiver);
         }
diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
index c7615fb93dbb..6b4ffb598db1 100644
--- a/drivers/usb/host/ehci-msm.c
+++ b/drivers/usb/host/ehci-msm.c
@@ -146,7 +146,7 @@ static int ehci_msm_probe(struct platform_device *pdev)
          * management.
          */
         phy = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (!phy) {
+        if (IS_ERR_OR_NULL(phy)) {
                 dev_err(&pdev->dev, "unable to find transceiver\n");
                 ret = -ENODEV;
                 goto unmap;
diff --git a/drivers/usb/host/ehci-mv.c b/drivers/usb/host/ehci-mv.c
index ef7aa0df40a6..0e8c168ca24c 100644
--- a/drivers/usb/host/ehci-mv.c
+++ b/drivers/usb/host/ehci-mv.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/usb/otg.h>
 #include <linux/platform_data/mv_usb.h>
 
@@ -254,7 +255,7 @@ static int mv_ehci_probe(struct platform_device *pdev)
         if (ehci_mv->mode == MV_USB_MODE_OTG) {
 #ifdef CONFIG_USB_OTG_UTILS
                 ehci_mv->otg = usb_get_phy(USB_PHY_TYPE_USB2);
-                if (!ehci_mv->otg) {
+                if (IS_ERR_OR_NULL(ehci_mv->otg)) {
                         dev_err(&pdev->dev,
                                 "unable to find transceiver\n");
                         retval = -ENODEV;
@@ -302,7 +303,7 @@ err_set_vbus:
                 pdata->set_vbus(0);
 #ifdef CONFIG_USB_OTG_UTILS
 err_put_transceiver:
-        if (ehci_mv->otg)
+        if (!IS_ERR_OR_NULL(ehci_mv->otg))
                 usb_put_phy(ehci_mv->otg);
 #endif
 err_disable_clk:
@@ -331,7 +332,7 @@ static int mv_ehci_remove(struct platform_device *pdev)
         if (hcd->rh_registered)
                 usb_remove_hcd(hcd);
 
-        if (ehci_mv->otg) {
+        if (!IS_ERR_OR_NULL(ehci_mv->otg)) {
                 otg_set_host(ehci_mv->otg->otg, NULL);
                 usb_put_phy(ehci_mv->otg);
         }
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 14df2f5cf6ae..477ecfa05154 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -17,6 +17,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/platform_data/tegra_usb.h>
 #include <linux/irq.h>
@@ -750,7 +751,7 @@ static int tegra_ehci_probe(struct platform_device *pdev)
 #ifdef CONFIG_USB_OTG_UTILS
         if (pdata->operating_mode == TEGRA_USB_OTG) {
                 tegra->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
-                if (tegra->transceiver)
+                if (!IS_ERR_OR_NULL(tegra->transceiver))
                         otg_set_host(tegra->transceiver->otg, &hcd->self);
         }
 #endif
@@ -773,7 +774,7 @@ static int tegra_ehci_probe(struct platform_device *pdev)
 
 fail:
 #ifdef CONFIG_USB_OTG_UTILS
-        if (tegra->transceiver) {
+        if (!IS_ERR_OR_NULL(tegra->transceiver)) {
                 otg_set_host(tegra->transceiver->otg, NULL);
                 usb_put_phy(tegra->transceiver);
         }
@@ -808,7 +809,7 @@ static int tegra_ehci_remove(struct platform_device *pdev)
         pm_runtime_put_noidle(&pdev->dev);
 
 #ifdef CONFIG_USB_OTG_UTILS
-        if (tegra->transceiver) {
+        if (!IS_ERR_OR_NULL(tegra->transceiver)) {
                 otg_set_host(tegra->transceiver->otg, NULL);
                 usb_put_phy(tegra->transceiver);
         }
diff --git a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c
index 92a77dfd1930..c7b06f504c60 100644
--- a/drivers/usb/host/ohci-omap.c
+++ b/drivers/usb/host/ohci-omap.c
@@ -18,6 +18,7 @@
 #include <linux/jiffies.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/gpio.h>
 
 #include <mach/hardware.h>
@@ -212,7 +213,7 @@ static int ohci_omap_init(struct usb_hcd *hcd)
 #ifdef  CONFIG_USB_OTG
         if (need_transceiver) {
                 ohci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
-                if (ohci->transceiver) {
+                if (!IS_ERR_OR_NULL(ohci->transceiver)) {
                         int     status = otg_set_host(ohci->transceiver->otg,
                                                 &ohci_to_hcd(ohci)->self);
                         dev_dbg(hcd->self.controller, "init %s transceiver, status %d\n",
@@ -403,7 +404,7 @@ usb_hcd_omap_remove (struct usb_hcd *hcd, struct platform_device *pdev)
         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 
         usb_remove_hcd(hcd);
-        if (ohci->transceiver) {
+        if (!IS_ERR_OR_NULL(ohci->transceiver)) {
                 (void) otg_set_host(ohci->transceiver->otg, 0);
                 usb_put_phy(ohci->transceiver);
         }
diff --git a/drivers/usb/musb/am35x.c b/drivers/usb/musb/am35x.c
index 4a8cbf0e8d51..7a95ab87ac00 100644
--- a/drivers/usb/musb/am35x.c
+++ b/drivers/usb/musb/am35x.c
@@ -29,6 +29,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
@@ -365,7 +366,7 @@ static int am35x_musb_init(struct musb *musb)
 
         usb_nop_xceiv_register();
         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (!musb->xceiv)
+        if (IS_ERR_OR_NULL(musb->xceiv))
                 return -ENODEV;
 
         if (is_host_enabled(musb))
diff --git a/drivers/usb/musb/blackfin.c b/drivers/usb/musb/blackfin.c
index 452940986d6d..428e6aa3e78a 100644
--- a/drivers/usb/musb/blackfin.c
+++ b/drivers/usb/musb/blackfin.c
@@ -15,6 +15,7 @@
 #include <linux/list.h>
 #include <linux/gpio.h>
 #include <linux/io.h>
+#include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/prefetch.h>
@@ -416,7 +417,7 @@ static int bfin_musb_init(struct musb *musb)
 
         usb_nop_xceiv_register();
         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (!musb->xceiv) {
+        if (IS_ERR_OR_NULL(musb->xceiv)) {
                 gpio_free(musb->config->gpio_vrsel);
                 return -ENODEV;
         }
diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
index d731c80c4fef..0f9fcec4e1d3 100644
--- a/drivers/usb/musb/da8xx.c
+++ b/drivers/usb/musb/da8xx.c
@@ -29,6 +29,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
@@ -426,7 +427,7 @@ static int da8xx_musb_init(struct musb *musb)
 
         usb_nop_xceiv_register();
         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (!musb->xceiv)
+        if (IS_ERR_OR_NULL(musb->xceiv))
                 goto fail;
 
         if (is_host_enabled(musb))
diff --git a/drivers/usb/musb/davinci.c b/drivers/usb/musb/davinci.c
index 582268de3fa2..f6492043655e 100644
--- a/drivers/usb/musb/davinci.c
+++ b/drivers/usb/musb/davinci.c
@@ -28,6 +28,7 @@
 #include <linux/list.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/io.h>
 #include <linux/gpio.h>
 #include <linux/platform_device.h>
@@ -385,7 +386,7 @@ static int davinci_musb_init(struct musb *musb)
 
         usb_nop_xceiv_register();
         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (!musb->xceiv)
+        if (IS_ERR_OR_NULL(musb->xceiv))
                 goto unregister;
 
         musb->mregs += DAVINCI_BASE_OFFSET;
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 92603e498e61..217808d9fbe1 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -31,6 +31,7 @@
 
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/pm_runtime.h>
@@ -377,7 +378,7 @@ static int dsps_musb_init(struct musb *musb)
         /* NOP driver needs change if supporting dual instance */
         usb_nop_xceiv_register();
         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (!musb->xceiv)
+        if (IS_ERR_OR_NULL(musb->xceiv))
                 return -ENODEV;
 
         /* Returns zero if e.g. not clocked */
diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index 2813490ba631..5fdb9da8dd56 100644
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -320,7 +320,7 @@ static int omap2430_musb_init(struct musb *musb)
          * which needs a driver, drivers aren't always needed.
          */
         musb->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
-        if (!musb->xceiv) {
+        if (IS_ERR_OR_NULL(musb->xceiv)) {
                 pr_err("HS USB OTG: no transceiver configured\n");
                 return -ENODEV;
         }
diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
index 8ddf3d5f7cdc..1a1bd9cf40c5 100644
--- a/drivers/usb/musb/tusb6010.c
+++ b/drivers/usb/musb/tusb6010.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
+#include <linux/err.h>
 #include <linux/init.h>
 #include <linux/prefetch.h>
 #include <linux/usb.h>
@@ -1079,7 +1080,7 @@ static int tusb_musb_init(struct musb *musb)
 
         usb_nop_xceiv_register();
         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (!musb->xceiv)
+        if (IS_ERR_OR_NULL(musb->xceiv))
                 return -ENODEV;
 
         pdev = to_platform_device(musb->controller);
diff --git a/drivers/usb/musb/ux500.c b/drivers/usb/musb/ux500.c
index 46cf80a8cacd..a8c0fadce1b0 100644
--- a/drivers/usb/musb/ux500.c
+++ b/drivers/usb/musb/ux500.c
@@ -23,6 +23,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 
@@ -38,7 +39,7 @@ struct ux500_glue {
 static int ux500_musb_init(struct musb *musb)
 {
         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
-        if (!musb->xceiv) {
+        if (IS_ERR_OR_NULL(musb->xceiv)) {
                 pr_err("HS USB OTG: no transceiver configured\n");
                 return -ENODEV;
         }
diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c
index 0fa4d8c1b1e8..88d62b16f632 100644
--- a/drivers/usb/otg/otg.c
+++ b/drivers/usb/otg/otg.c
@@ -67,7 +67,7 @@ struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
                 return NULL;
 
         phy = usb_get_phy(type);
-        if (phy) {
+        if (!IS_ERR(phy)) {
                 *ptr = phy;
                 devres_add(dev, ptr);
         } else
@@ -82,7 +82,7 @@ EXPORT_SYMBOL(devm_usb_get_phy);
  * @type - the type of the phy the controller requires
  *
  * Returns the phy driver, after getting a refcount to it; or
- * null if there is no such phy.  The caller is responsible for
+ * -ENODEV if there is no such phy.  The caller is responsible for
  * calling usb_put_phy() to release that count.
  *
  * For use by USB host and peripheral drivers.