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virtio-serial-bus: use correct lengths in control_out() message 

Original code has one thing to process (cur_len), requests to
convert from iovec to buf another thing (len which is actually max_len),
and processes something else (copied).  Whole thing is very difficult
to understand, even if it does a right thing.  The iov_to_buf()
conversion in this case will always return cur_len, because it is
the length of the iovec it was asked to process, and the size we
asked to convert is the same or larger, and iov_to_buf() will stop
at reaching either iov or buf.

Make the code saner by doing the only sane thing: dropping `copied'
which is always the same as `cur_len' but just introduces questions.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
master
Michael Tokarev 2012-03-11 17:52:59 +04:00
parent 083dbf489d
commit 45270ad8a8
1 changed files with 3 additions and 3 deletions
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6
hw/virtio-serial-bus.c
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@ -454,7 +454,7 @@ static void control_out(VirtIODevice *vdev, VirtQueue *vq)
len = 0;
buf = NULL;
while (virtqueue_pop(vq, &elem)) {
size_t cur_len, copied;
size_t cur_len;
cur_len = iov_size(elem.out_sg, elem.out_num);
/*
@ -467,9 +467,9 @@ static void control_out(VirtIODevice *vdev, VirtQueue *vq)
buf = g_malloc(cur_len);
len = cur_len;
}
copied = iov_to_buf(elem.out_sg, elem.out_num, buf, 0, len);
iov_to_buf(elem.out_sg, elem.out_num, buf, 0, cur_len);
handle_control_message(vser, buf, copied);
handle_control_message(vser, buf, cur_len);
virtqueue_push(vq, &elem, 0);
}
g_free(buf);