[char-misc-next 04/10] mei: debugfs: adjust print buffer

From: Tomas Winkler
Date: Mon Aug 25 2014 - 17:54:37 EST


From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>

In case of many me clients (15 and more) 1K buffer
is not enough for full information print.
Calculate buffer size according to real clients number.

Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
---
drivers/misc/mei/debugfs.c | 22 +++++++++++++++-------
1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
index 2399b31..ca2a12d 100644
--- a/drivers/misc/mei/debugfs.c
+++ b/drivers/misc/mei/debugfs.c
@@ -29,20 +29,28 @@ static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
{
struct mei_device *dev = fp->private_data;
struct mei_me_client *me_cl;
- const size_t bufsz = 1024;
- char *buf = kzalloc(bufsz, GFP_KERNEL);
+ size_t bufsz = 1;
+ char *buf;
int i = 0;
int pos = 0;
int ret;

- if (!buf)
- return -ENOMEM;
-
- pos += scnprintf(buf + pos, bufsz - pos,
- " |id|addr| UUID |con|msg len|\n");
+#define HDR " |id|addr| UUID |con|msg len|\n"

mutex_lock(&dev->device_lock);

+ list_for_each_entry(me_cl, &dev->me_clients, list)
+ bufsz++;
+
+ bufsz *= sizeof(HDR) + 1;
+ buf = kzalloc(bufsz, GFP_KERNEL);
+ if (!buf) {
+ mutex_unlock(&dev->device_lock);
+ return -ENOMEM;
+ }
+
+ pos += scnprintf(buf + pos, bufsz - pos, HDR);
+
/* if the driver is not enabled the list won't be consistent */
if (dev->dev_state != MEI_DEV_ENABLED)
goto out;
--
1.9.3

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