ARM: OMAP2+: Return correct error values from device and hwmod

Without this patch function pm_runtime_get_sync() returns 0 even when
some omap subfunction fails. This patch properly propagate error codes
from omap functions back to caller.

This patch fix problem, when loading omap-aes driver in qemu cause
kernel oops.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
[paul@pwsan.com: fix a checkpatch warning]
Signed-off-by: Paul Walmsley <paul@pwsan.com>

diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
index 166b18f..4a7303c 100644 (file)
--- a/arch/arm/mach-omap2/omap_device.c
+++ b/arch/arm/mach-omap2/omap_device.c
@@ -224,13 +224,13 @@ static int _omap_device_notifier_call(struct notifier_block *nb,
  */
 static int _omap_device_enable_hwmods(struct omap_device *od)
 {
+       int ret = 0;
        int i;
 
        for (i = 0; i < od->hwmods_cnt; i++)
-               omap_hwmod_enable(od->hwmods[i]);
+               ret |= omap_hwmod_enable(od->hwmods[i]);
 
-       /* XXX pass along return value here? */
-       return 0;
+       return ret;
 }
 
 /**
@@ -241,13 +241,13 @@ static int _omap_device_enable_hwmods(struct omap_device *od)
  */
 static int _omap_device_idle_hwmods(struct omap_device *od)
 {
+       int ret = 0;
        int i;
 
        for (i = 0; i < od->hwmods_cnt; i++)
-               omap_hwmod_idle(od->hwmods[i]);
+               ret |= omap_hwmod_idle(od->hwmods[i]);
 
-       /* XXX pass along return value here? */
-       return 0;
+       return ret;
 }
 
 /* Public functions for use by core code */
@@ -595,18 +595,20 @@ static int _od_runtime_suspend(struct device *dev)
        int ret;
 
        ret = pm_generic_runtime_suspend(dev);
+       if (ret)
+               return ret;
 
-       if (!ret)
-               omap_device_idle(pdev);
-
-       return ret;
+       return omap_device_idle(pdev);
 }
 
 static int _od_runtime_resume(struct device *dev)
 {
        struct platform_device *pdev = to_platform_device(dev);
+       int ret;
 
-       omap_device_enable(pdev);
+       ret = omap_device_enable(pdev);
+       if (ret)
+               return ret;
 
        return pm_generic_runtime_resume(dev);
 }
@@ -743,7 +745,8 @@ int omap_device_enable(struct platform_device *pdev)
 
        ret = _omap_device_enable_hwmods(od);
 
-       od->_state = OMAP_DEVICE_STATE_ENABLED;
+       if (ret == 0)
+               od->_state = OMAP_DEVICE_STATE_ENABLED;
 
        return ret;
 }
@@ -773,7 +776,8 @@ int omap_device_idle(struct platform_device *pdev)
 
        ret = _omap_device_idle_hwmods(od);
 
-       od->_state = OMAP_DEVICE_STATE_IDLE;
+       if (ret == 0)
+               od->_state = OMAP_DEVICE_STATE_IDLE;
 
        return ret;
 }

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 752969f..d78c12e 100644 (file)
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -3318,16 +3318,17 @@ int omap_hwmod_enable(struct omap_hwmod *oh)
  */
 int omap_hwmod_idle(struct omap_hwmod *oh)
 {
+       int r;
        unsigned long flags;
 
        if (!oh)
                return -EINVAL;
 
        spin_lock_irqsave(&oh->_lock, flags);
-       _idle(oh);
+       r = _idle(oh);
        spin_unlock_irqrestore(&oh->_lock, flags);
 
-       return 0;
+       return r;
 }
 
 /**
@@ -3340,16 +3341,17 @@ int omap_hwmod_idle(struct omap_hwmod *oh)
  */
 int omap_hwmod_shutdown(struct omap_hwmod *oh)
 {
+       int r;
        unsigned long flags;
 
        if (!oh)
                return -EINVAL;
 
        spin_lock_irqsave(&oh->_lock, flags);
-       _shutdown(oh);
+       r = _shutdown(oh);
        spin_unlock_irqrestore(&oh->_lock, flags);
 
-       return 0;
+       return r;
 }
 
 /*