drm/crc: Only report a single overflow when a CRC fd is opened

[linux-2.6-microblaze.git] / drivers / gpu / drm / drm_debugfs_crc.c

diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
index 9f83121..9996119 100644 (file)
--- a/drivers/gpu/drm/drm_debugfs_crc.c
+++ b/drivers/gpu/drm/drm_debugfs_crc.c
@@ -139,6 +139,7 @@ static int crtc_crc_data_count(struct drm_crtc_crc *crc)
 static void crtc_crc_cleanup(struct drm_crtc_crc *crc)
 {
        kfree(crc->entries);
+       crc->overflow = false;
        crc->entries = NULL;
        crc->head = 0;
        crc->tail = 0;
@@ -391,8 +392,14 @@ int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame,
        tail = crc->tail;
 
        if (CIRC_SPACE(head, tail, DRM_CRC_ENTRIES_NR) < 1) {
+               bool was_overflow = crc->overflow;
+
+               crc->overflow = true;
                spin_unlock(&crc->lock);
-               DRM_ERROR("Overflow of CRC buffer, userspace reads too slow.\n");
+
+               if (!was_overflow)
+                       DRM_ERROR("Overflow of CRC buffer, userspace reads too slow.\n");
+
                return -ENOBUFS;
        }