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OpenCloudOS-Kernel
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phy: phy-core: increment refcounting variables only on 'success' 

Increment 'init_count' only if the 'init' callback succeeded and decrement
'init_count' only if the 'exit' callback succeded. Increment 'power_count'
only if 'power_on' callback succeded and if it failed disable the clocks using
phy_pm_runtime_put_sync(). Also decrement 'power_count' only if 'power_off'
callback succeded and if it failed do not disable the clocks.

Reported-by: George Cherian <george.cherian@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Kishon Vijay Abraham I 2013-12-20 10:36:49 +05:30
parent cedb7f89d1
commit 637d378cea
1 changed files with 14 additions and 8 deletions
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22
drivers/phy/phy-core.c
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@ -167,13 +167,14 @@ int phy_init(struct phy *phy)
return ret;
mutex_lock(&phy->mutex);
if (phy->init_count++ == 0 && phy->ops->init) {
if (phy->init_count == 0 && phy->ops->init) {
ret = phy->ops->init(phy);
if (ret < 0) {
dev_err(&phy->dev, "phy init failed --> %d\n", ret);
goto out;
}
}
++phy->init_count;
out:
mutex_unlock(&phy->mutex);
@ -191,13 +192,14 @@ int phy_exit(struct phy *phy)
return ret;
mutex_lock(&phy->mutex);
if (--phy->init_count == 0 && phy->ops->exit) {
if (phy->init_count == 1 && phy->ops->exit) {
ret = phy->ops->exit(phy);
if (ret < 0) {
dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
goto out;
}
}
--phy->init_count;
out:
mutex_unlock(&phy->mutex);
@ -215,16 +217,20 @@ int phy_power_on(struct phy *phy)
return ret;
mutex_lock(&phy->mutex);
if (phy->power_count++ == 0 && phy->ops->power_on) {
if (phy->power_count == 0 && phy->ops->power_on) {
ret = phy->ops->power_on(phy);
if (ret < 0) {
dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
goto out;
}
}
++phy->power_count;
mutex_unlock(&phy->mutex);
return 0;
out:
mutex_unlock(&phy->mutex);
phy_pm_runtime_put_sync(phy);
return ret;
}
@ -235,19 +241,19 @@ int phy_power_off(struct phy *phy)
int ret = -ENOTSUPP;
mutex_lock(&phy->mutex);
if (--phy->power_count == 0 && phy->ops->power_off) {
if (phy->power_count == 1 && phy->ops->power_off) {
ret = phy->ops->power_off(phy);
if (ret < 0) {
dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
goto out;
mutex_unlock(&phy->mutex);
return ret;
}
}
out:
--phy->power_count;
mutex_unlock(&phy->mutex);
phy_pm_runtime_put(phy);
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(phy_power_off);