diff options
Diffstat (limited to 'drivers/gpu/drm/drm_fops.c')
| -rw-r--r-- | drivers/gpu/drm/drm_fops.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c index ed7bc68f7e87..0b9514b6cd64 100644 --- a/drivers/gpu/drm/drm_fops.c +++ b/drivers/gpu/drm/drm_fops.c @@ -515,16 +515,19 @@ ssize_t drm_read(struct file *filp, char __user *buffer, size_t total; ssize_t ret; - ret = wait_event_interruptible(file_priv->event_wait, - !list_empty(&file_priv->event_list)); - if (ret < 0) - return ret; + if ((filp->f_flags & O_NONBLOCK) == 0) { + ret = wait_event_interruptible(file_priv->event_wait, + !list_empty(&file_priv->event_list)); + if (ret < 0) + return ret; + } total = 0; while (drm_dequeue_event(file_priv, total, count, &e)) { if (copy_to_user(buffer + total, e->event, e->event->length)) { total = -EFAULT; + e->destroy(e); break; } @@ -532,7 +535,7 @@ ssize_t drm_read(struct file *filp, char __user *buffer, e->destroy(e); } - return total; + return total ?: -EAGAIN; } EXPORT_SYMBOL(drm_read); |