[PATCH v2] drm: Set crc->opened to false before setting crc source to NULL.

[David (Dingchen) Zhang]

From: Dingchen Zhang <dingchen.zhang at amd.com>

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.

v2: Move spin_lock around entire crc->opened use (Daniel)

Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: Harry Wentland <Harry.Wentland at amd.com>
Cc: Nick Kazlauskas <Nicholas.Kazlauskas at amd.com>
Signed-off-by: Dingchen Zhang <dingchen.zhang at amd.com>
---
 drivers/gpu/drm/drm_debugfs_crc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
index dac267e840af..f87148203599 100644
--- a/drivers/gpu/drm/drm_debugfs_crc.c
+++ b/drivers/gpu/drm/drm_debugfs_crc.c
@@ -249,6 +249,12 @@ 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 */
+	spin_lock_irq(&crc->lock);
+	if (crc->opened)
+		crc->opened = false;
+	spin_unlock_irq(&crc->lock);
+
 	crtc->funcs->set_crc_source(crtc, NULL);
 
 	spin_lock_irq(&crc->lock);
-- 
2.17.1