[PATCH] wlcore: use memdup_user

[Geliang Tang]

Use memdup_user() helper instead of open-coding to simplify the code.

Signed-off-by: Geliang Tang <geliangt...@gmail.com>
---
 drivers/net/wireless/ti/wlcore/debugfs.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/ti/wlcore/debugfs.c 
b/drivers/net/wireless/ti/wlcore/debugfs.c
index de7e2a5..a2cb408 100644
--- a/drivers/net/wireless/ti/wlcore/debugfs.c
+++ b/drivers/net/wireless/ti/wlcore/debugfs.c
@@ -1149,15 +1149,9 @@ static ssize_t dev_mem_write(struct file *file, const 
char __user *user_buf,
        part.mem.start = *ppos;
        part.mem.size = bytes;
 
-       buf = kmalloc(bytes, GFP_KERNEL);
-       if (!buf)
-               return -ENOMEM;
-
-       ret = copy_from_user(buf, user_buf, bytes);
-       if (ret) {
-               ret = -EFAULT;
-               goto err_out;
-       }
+       buf = memdup_user(user_buf, bytes);
+       if (IS_ERR(buf))
+               return PTR_ERR(buf);
 
        mutex_lock(&wl->mutex);
 
@@ -1197,7 +1191,6 @@ static ssize_t dev_mem_write(struct file *file, const 
char __user *user_buf,
        if (ret == 0)
                *ppos += bytes;
 
-err_out:
        kfree(buf);
 
        return ((ret == 0) ? bytes : ret);
-- 
2.9.3