From 062171973e05440673cb997e64395e84a8e66350 Mon Sep 17 00:00:00 2001 From: Charles Keepax Date: Tue, 13 Jun 2017 16:12:47 +0100 Subject: regulator: core: Prioritise consumer mappings over regulator name Currently, when looking up a regulator supply, the regulator name takes priority over the consumer mappings. As there are a lot of regulator names that are in fairly common use (VDD, MICVDD, etc.) this can easily lead to obtaining the wrong supply, when a system contains two regulators that share a name. The explicit consumer mappings contain much less ambiguity as they specify both a name and a consumer device. As such prioritise those if one exists and only fall back to the regulator name if there are no matching explicit mappings. Signed-off-by: Charles Keepax Signed-off-by: Mark Brown --- drivers/regulator/core.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/regulator') diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index c0d9ae8d0860..a0362a63902e 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1462,7 +1462,7 @@ static struct regulator_dev *regulator_lookup_by_name(const char *name) static struct regulator_dev *regulator_dev_lookup(struct device *dev, const char *supply) { - struct regulator_dev *r; + struct regulator_dev *r = NULL; struct device_node *node; struct regulator_map *map; const char *devname = NULL; @@ -1489,10 +1489,6 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev, if (dev) devname = dev_name(dev); - r = regulator_lookup_by_name(supply); - if (r) - return r; - mutex_lock(®ulator_list_mutex); list_for_each_entry(map, ®ulator_map_list, list) { /* If the mapping has a device set up it must match */ @@ -1508,6 +1504,10 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev, } mutex_unlock(®ulator_list_mutex); + if (r) + return r; + + r = regulator_lookup_by_name(supply); if (r) return r; -- cgit v1.2.3 From dbc559554086f176b04f97eec561ad26ee54e47c Mon Sep 17 00:00:00 2001 From: Haishan Zhou Date: Fri, 30 Jun 2017 11:43:42 +0800 Subject: regulator: core: Fix size limit of supply_map Now the debugfs file supply_map has a size limit PAGE_SIZE and the user can not see the whole content of regulator_map_list when it is larger than this limit. This patch uses seq_file instead to make sure supply_map shows the full information of regulator_map_list. Signed-off-by: Haishan Zhou Signed-off-by: Mark Brown --- drivers/regulator/core.c | 36 +++++++++++++----------------------- 1 file changed, 13 insertions(+), 23 deletions(-) (limited to 'drivers/regulator') diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index a0362a63902e..f8e76f73da35 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -4311,41 +4311,31 @@ void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); #ifdef CONFIG_DEBUG_FS -static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, - size_t count, loff_t *ppos) +static int supply_map_show(struct seq_file *sf, void *data) { - char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); - ssize_t len, ret = 0; struct regulator_map *map; - if (!buf) - return -ENOMEM; - list_for_each_entry(map, ®ulator_map_list, list) { - len = snprintf(buf + ret, PAGE_SIZE - ret, - "%s -> %s.%s\n", - rdev_get_name(map->regulator), map->dev_name, - map->supply); - if (len >= 0) - ret += len; - if (ret > PAGE_SIZE) { - ret = PAGE_SIZE; - break; - } + seq_printf(sf, "%s -> %s.%s\n", + rdev_get_name(map->regulator), map->dev_name, + map->supply); } - ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); - - kfree(buf); + return 0; +} - return ret; +static int supply_map_open(struct inode *inode, struct file *file) +{ + return single_open(file, supply_map_show, inode->i_private); } #endif static const struct file_operations supply_map_fops = { #ifdef CONFIG_DEBUG_FS - .read = supply_map_read_file, - .llseek = default_llseek, + .open = supply_map_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, #endif }; -- cgit v1.2.3