When userspace takes drm_master, the drm_client buffer is no more
visible, so drm_log shouldn't waste CPU cycle to draw on it.
Signed-off-by: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
---
drivers/gpu/drm/clients/drm_log.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/clients/drm_log.c b/drivers/gpu/drm/clients/drm_log.c
index cb793a348f1f9..8eca8044f1f08 100644
--- a/drivers/gpu/drm/clients/drm_log.c
+++ b/drivers/gpu/drm/clients/drm_log.c
@@ -19,6 +19,7 @@
#include "drm_client_internal.h"
#include "../drm_draw.h"
+#include "../drm_internal.h"
MODULE_AUTHOR("Jocelyn Falempe");
MODULE_DESCRIPTION("DRM boot logger");
@@ -308,8 +309,13 @@ static void drm_log_write_thread(struct console *con, struct nbcon_write_context
if (!dlog->probed)
drm_log_init_client(dlog);
- for (i = 0; i < dlog->n_scanout; i++)
- drm_log_draw_kmsg_record(&dlog->scanout[i], wctxt->outbuf, wctxt->len);
+ /* Check that we are still the master before drawing */
+ if (drm_master_internal_acquire(dlog->client.dev)) {
+ drm_master_internal_release(dlog->client.dev);
+
+ for (i = 0; i < dlog->n_scanout; i++)
+ drm_log_draw_kmsg_record(&dlog->scanout[i], wctxt->outbuf, wctxt->len);
+ }
}
static void drm_log_lock(struct console *con, unsigned long *flags)
--
2.47.0
