aboutsummaryrefslogtreecommitdiff
path: root/drivers/vhost
diff options
context:
space:
mode:
authorMichael S. Tsirkin <mst@redhat.com>2011-01-10 10:03:20 +0200
committerMichael S. Tsirkin <mst@redhat.com>2011-01-10 10:03:39 +0200
commit0174b0c30a9de25dcb0d3049defcfad0c2947a36 (patch)
treec7d4430ea5f83b52c9074df6770ad6281735bbc3 /drivers/vhost
parent0c21e3aaf6ae85bee804a325aa29c325209180fd (diff)
downloadlinux-linaro-stable-0174b0c30a9de25dcb0d3049defcfad0c2947a36.tar.gz
vhost: fix signed/unsigned comparison
To detect that a sequence number is done, we are doing math on unsigned integers so the result is unsigned too. Not what was intended for the <= comparison. The result is user stuck forever in flush call. Convert to int to fix this. Further, get rid of ({}) to make code clearer. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vhost.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 38244f59cdd9..ade0568c07a4 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -97,22 +97,26 @@ void vhost_poll_stop(struct vhost_poll *poll)
remove_wait_queue(poll->wqh, &poll->wait);
}
+static bool vhost_work_seq_done(struct vhost_dev *dev, struct vhost_work *work,
+ unsigned seq)
+{
+ int left;
+ spin_lock_irq(&dev->work_lock);
+ left = seq - work->done_seq;
+ spin_unlock_irq(&dev->work_lock);
+ return left <= 0;
+}
+
static void vhost_work_flush(struct vhost_dev *dev, struct vhost_work *work)
{
unsigned seq;
- int left;
int flushing;
spin_lock_irq(&dev->work_lock);
seq = work->queue_seq;
work->flushing++;
spin_unlock_irq(&dev->work_lock);
- wait_event(work->done, ({
- spin_lock_irq(&dev->work_lock);
- left = seq - work->done_seq <= 0;
- spin_unlock_irq(&dev->work_lock);
- left;
- }));
+ wait_event(work->done, vhost_work_seq_done(dev, work, seq));
spin_lock_irq(&dev->work_lock);
flushing = --work->flushing;
spin_unlock_irq(&dev->work_lock);