diff options
Diffstat (limited to 'drivers/base/power')
| -rw-r--r-- | drivers/base/power/opp.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c index 66888861f9eb..c8a908b099c0 100644 --- a/drivers/base/power/opp.c +++ b/drivers/base/power/opp.c @@ -235,7 +235,10 @@ EXPORT_SYMBOL(opp_get_opp_count); * * Searches for exact match in the opp list and returns pointer to the matching * opp if found, else returns ERR_PTR in case of error and should be handled - * using IS_ERR. + * using IS_ERR. Error return values can be: + * EINVAL: for bad pointer + * ERANGE: no match found for search + * ENODEV: if device not found in list of registered devices * * Note: available is a modifier for the search. if available=true, then the * match is for exact matching frequency and is available in the stored OPP @@ -254,7 +257,7 @@ struct opp *opp_find_freq_exact(struct device *dev, unsigned long freq, bool available) { struct device_opp *dev_opp; - struct opp *temp_opp, *opp = ERR_PTR(-ENODEV); + struct opp *temp_opp, *opp = ERR_PTR(-ERANGE); dev_opp = find_device_opp(dev); if (IS_ERR(dev_opp)) { @@ -284,7 +287,11 @@ EXPORT_SYMBOL(opp_find_freq_exact); * for a device. * * Returns matching *opp and refreshes *freq accordingly, else returns - * ERR_PTR in case of error and should be handled using IS_ERR. + * ERR_PTR in case of error and should be handled using IS_ERR. Error return + * values can be: + * EINVAL: for bad pointer + * ERANGE: no match found for search + * ENODEV: if device not found in list of registered devices * * Locking: This function must be called under rcu_read_lock(). opp is a rcu * protected pointer. The reason for the same is that the opp pointer which is @@ -295,7 +302,7 @@ EXPORT_SYMBOL(opp_find_freq_exact); struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq) { struct device_opp *dev_opp; - struct opp *temp_opp, *opp = ERR_PTR(-ENODEV); + struct opp *temp_opp, *opp = ERR_PTR(-ERANGE); if (!dev || !freq) { dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); @@ -304,7 +311,7 @@ struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq) dev_opp = find_device_opp(dev); if (IS_ERR(dev_opp)) - return opp; + return ERR_CAST(dev_opp); list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) { if (temp_opp->available && temp_opp->rate >= *freq) { @@ -327,7 +334,11 @@ EXPORT_SYMBOL(opp_find_freq_ceil); * for a device. * * Returns matching *opp and refreshes *freq accordingly, else returns - * ERR_PTR in case of error and should be handled using IS_ERR. + * ERR_PTR in case of error and should be handled using IS_ERR. Error return + * values can be: + * EINVAL: for bad pointer + * ERANGE: no match found for search + * ENODEV: if device not found in list of registered devices * * Locking: This function must be called under rcu_read_lock(). opp is a rcu * protected pointer. The reason for the same is that the opp pointer which is @@ -338,7 +349,7 @@ EXPORT_SYMBOL(opp_find_freq_ceil); struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq) { struct device_opp *dev_opp; - struct opp *temp_opp, *opp = ERR_PTR(-ENODEV); + struct opp *temp_opp, *opp = ERR_PTR(-ERANGE); if (!dev || !freq) { dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); @@ -347,7 +358,7 @@ struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq) dev_opp = find_device_opp(dev); if (IS_ERR(dev_opp)) - return opp; + return ERR_CAST(dev_opp); list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) { if (temp_opp->available) { |