rsxx: don't open-code memdup_user()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/drivers/block/rsxx/core.c b/drivers/block/rsxx/core.c
index d8b2488..34997df 100644 (file)
--- a/drivers/block/rsxx/core.c
+++ b/drivers/block/rsxx/core.c
@@ -203,14 +203,11 @@ static ssize_t rsxx_cram_write(struct file *fp, const char __user *ubuf,
        char *buf;
        ssize_t st;
 
-       buf = kzalloc(cnt, GFP_KERNEL);
-       if (!buf)
-               return -ENOMEM;
+       buf = memdup_user(ubuf, cnt);
+       if (IS_ERR(buf))
+               return PTR_ERR(buf);
 
-       st = copy_from_user(buf, ubuf, cnt);
-       if (!st)
-               st = rsxx_creg_write(card, CREG_ADD_CRAM + (u32)*ppos, cnt,
-                                    buf, 1);
+       st = rsxx_creg_write(card, CREG_ADD_CRAM + (u32)*ppos, cnt, buf, 1);
        kfree(buf);
        if (st)
                return st;