[PATCH 2/2] drm: Set crc->opened = false before setting crc source to NULL.

[Dingchen Zhang]

to terminate the while-loop in drm_dp_aux_crc_work when drm_dp_start/stop_crc
are called in the hook to set crc source.

Cc:Leo Li <sunpeng.li at amd.com>, Harry <Harry.Wentland at amd.com>, Nick <Nicholas.Kazlauskas at amd.com>
Signed-off-by: Dingchen Zhang <dingchen.zhang at amd.com>
---
 drivers/gpu/drm/drm_debugfs_crc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
index e20adef9d623..0e8bcc130383 100644
--- a/drivers/gpu/drm/drm_debugfs_crc.c
+++ b/drivers/gpu/drm/drm_debugfs_crc.c
@@ -249,6 +249,13 @@ static int crtc_crc_release(struct inode *inode, struct file *filep)
 	struct drm_crtc *crtc = filep->f_inode->i_private;
 	struct drm_crtc_crc *crc = &crtc->crc;
 
+	/* terminate the infinite while loop if 'drm_dp_aux_crc_work' running */
+	if (crc->opened) {
+		spin_lock_irq(&crc->lock);
+		crc->opened = false;
+		spin_unlock_irq(&crc->lock);
+	}
+
 	crtc->funcs->set_crc_source(crtc, NULL);
 
 	spin_lock_irq(&crc->lock);
-- 
2.17.1