diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2014-10-07 14:13:51 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-10-08 15:07:07 +0200 |
| commit | bd008e5b2953186fc0c6633a885ade95e7043800 (patch) | |
| tree | fd2dccbe46c751fd9db37005f16517212ab339ad /drivers/gpu/drm/drm_fops.c | |
| parent | 1bcecfacde6269dc6cee9a098bc454222d441ff9 (diff) | |
| download | linux-rt-bd008e5b2953186fc0c6633a885ade95e7043800.tar.gz | |
drm: Implement O_NONBLOCK support on /dev/dri/cardN
The implmentation is simple in the extreme: we only want to wait for
events if the device was opened in blocking mode, otherwise we grab what
is available and report an error if there was none.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Testcase: igt/kms_flip/nonblocing_read
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/drm_fops.c')
| -rw-r--r-- | drivers/gpu/drm/drm_fops.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c index ed7bc68f7e87..91e1105f2800 100644 --- a/drivers/gpu/drm/drm_fops.c +++ b/drivers/gpu/drm/drm_fops.c @@ -515,10 +515,12 @@ 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)) { @@ -532,7 +534,7 @@ ssize_t drm_read(struct file *filp, char __user *buffer, e->destroy(e); } - return total; + return total ?: -EAGAIN; } EXPORT_SYMBOL(drm_read); |