linux-kernel - Applied "regulator: core: Fix size limit of supply

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Date:   Fri, 30 Jun 2017 13:00:01 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Haishan Zhou <zhssmail@...il.com>
Cc:     Mark Brown <broonie@...nel.org>, lrg@...com, broonie@...nel.org,
        linux-kernel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Applied "regulator: core: Fix size limit of supply_map" to the regulator tree

The patch

   regulator: core: Fix size limit of supply_map

has been applied to the regulator tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From dbc559554086f176b04f97eec561ad26ee54e47c Mon Sep 17 00:00:00 2001
From: Haishan Zhou <zhssmail@...il.com>
Date: Fri, 30 Jun 2017 11:43:42 +0800
Subject: [PATCH] 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 <zhssmail@...il.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/regulator/core.c | 36 +++++++++++++-----------------------
 1 file changed, 13 insertions(+), 23 deletions(-)

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, &regulator_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
 };
 
-- 
2.13.2