[PATCH] make kernel/relay.c __user-clean

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

diff --git a/kernel/relay.c b/kernel/relay.c
index 1d63ecddfa7018cd4a14f8b6dc24c352a9ddc447..f04bbdb56ac2a9123003b45d909f9ef6e971fd5e 100644 (file)
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -887,7 +887,7 @@ static int subbuf_read_actor(size_t read_start,
 
        from = buf->start + read_start;
        ret = avail;
-       if (copy_to_user(desc->arg.data, from, avail)) {
+       if (copy_to_user(desc->arg.buf, from, avail)) {
                desc->error = -EFAULT;
                ret = 0;
        }
@@ -946,24 +946,17 @@ typedef int (*subbuf_actor_t) (size_t read_start,
  */
 static inline ssize_t relay_file_read_subbufs(struct file *filp,
                                              loff_t *ppos,
-                                             size_t count,
                                              subbuf_actor_t subbuf_actor,
                                              read_actor_t actor,
-                                             void *target)
+                                             read_descriptor_t *desc)
 {
        struct rchan_buf *buf = filp->private_data;
        size_t read_start, avail;
-       read_descriptor_t desc;
        int ret;
 
-       if (!count)
+       if (!desc->count)
                return 0;
 
-       desc.written = 0;
-       desc.count = count;
-       desc.arg.data = target;
-       desc.error = 0;
-
        mutex_lock(&filp->f_dentry->d_inode->i_mutex);
        do {
                if (!relay_file_read_avail(buf, *ppos))
@@ -974,19 +967,19 @@ static inline ssize_t relay_file_read_subbufs(struct file *filp,
                if (!avail)
                        break;
 
-               avail = min(desc.count, avail);
-               ret = subbuf_actor(read_start, buf, avail, &desc, actor);
-               if (desc.error < 0)
+               avail = min(desc->count, avail);
+               ret = subbuf_actor(read_start, buf, avail, desc, actor);
+               if (desc->error < 0)
                        break;
 
                if (ret) {
                        relay_file_read_consume(buf, read_start, ret);
                        *ppos = relay_file_read_end_pos(buf, read_start, ret);
                }
-       } while (desc.count && ret);
+       } while (desc->count && ret);
        mutex_unlock(&filp->f_dentry->d_inode->i_mutex);
 
-       return desc.written;
+       return desc->written;
 }
 
 static ssize_t relay_file_read(struct file *filp,
@@ -994,8 +987,13 @@ static ssize_t relay_file_read(struct file *filp,
                               size_t count,
                               loff_t *ppos)
 {
-       return relay_file_read_subbufs(filp, ppos, count, subbuf_read_actor,
-                                      NULL, buffer);
+       read_descriptor_t desc;
+       desc.written = 0;
+       desc.count = count;
+       desc.arg.buf = buffer;
+       desc.error = 0;
+       return relay_file_read_subbufs(filp, ppos, subbuf_read_actor,
+                                      NULL, &desc);
 }
 
 static ssize_t relay_file_sendfile(struct file *filp,
@@ -1004,8 +1002,13 @@ static ssize_t relay_file_sendfile(struct file *filp,
                                   read_actor_t actor,
                                   void *target)
 {
-       return relay_file_read_subbufs(filp, ppos, count, subbuf_send_actor,
-                                      actor, target);
+       read_descriptor_t desc;
+       desc.written = 0;
+       desc.count = count;
+       desc.arg.data = target;
+       desc.error = 0;
+       return relay_file_read_subbufs(filp, ppos, subbuf_send_actor,
+                                      actor, &desc);
 }
 
 struct file_operations relay_file_operations = {