drm: Free the writeback_job when it with an empty fb

Adds the check if the writeback_job with an empty fb, then it should
be freed in atomic_check phase.

With this change, the driver users will not check empty fb case any more.
So refined accordingly.

Signed-off-by: Lowry Li (Arm Technology China) <lowry.li@arm.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Signed-off-by: james qian wang (Arm Technology China) <james.qian.wang@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1564571048-15029-2-git-send-email-lowry.li@arm.com

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c b/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
index 2851cac..23fbee2 100644 (file)
--- a/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
@@ -43,9 +43,8 @@ komeda_wb_encoder_atomic_check(struct drm_encoder *encoder,
        struct komeda_data_flow_cfg dflow;
        int err;
 
-       if (!writeback_job || !writeback_job->fb) {
+       if (!writeback_job)
                return 0;
-       }
 
        if (!crtc_st->active) {
                DRM_DEBUG_ATOMIC("Cannot write the composition result out on a inactive CRTC.\n");

diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
index 2e81252..a59227b 100644 (file)
--- a/drivers/gpu/drm/arm/malidp_mw.c
+++ b/drivers/gpu/drm/arm/malidp_mw.c
@@ -130,7 +130,7 @@ malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
        struct drm_framebuffer *fb;
        int i, n_planes;
 
-       if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
+       if (!conn_state->writeback_job)
                return 0;
 
        fb = conn_state->writeback_job->fb;
@@ -247,7 +247,7 @@ void malidp_mw_atomic_commit(struct drm_device *drm,
 
        mw_state = to_mw_state(conn_state);
 
-       if (conn_state->writeback_job && conn_state->writeback_job->fb) {
+       if (conn_state->writeback_job) {
                struct drm_framebuffer *fb = conn_state->writeback_job->fb;
 
                DRM_DEV_DEBUG_DRIVER(drm->dev,

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 419381a..14aeaf7 100644 (file)
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -430,10 +430,15 @@ static int drm_atomic_connector_check(struct drm_connector *connector,
                return -EINVAL;
        }
 
-       if (writeback_job->out_fence && !writeback_job->fb) {
-               DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] requesting out-fence without framebuffer\n",
-                                connector->base.id, connector->name);
-               return -EINVAL;
+       if (!writeback_job->fb) {
+               if (writeback_job->out_fence) {
+                       DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] requesting out-fence without framebuffer\n",
+                                        connector->base.id, connector->name);
+                       return -EINVAL;
+               }
+
+               drm_writeback_cleanup_job(writeback_job);
+               state->writeback_job = NULL;
        }
 
        return 0;

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_writeback.c b/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
index ae07290..04efa78 100644 (file)
--- a/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
@@ -147,7 +147,7 @@ static int rcar_du_wb_enc_atomic_check(struct drm_encoder *encoder,
        struct drm_device *dev = encoder->dev;
        struct drm_framebuffer *fb;
 
-       if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
+       if (!conn_state->writeback_job)
                return 0;
 
        fb = conn_state->writeback_job->fb;
@@ -221,7 +221,7 @@ void rcar_du_writeback_setup(struct rcar_du_crtc *rcrtc,
        unsigned int i;
 
        state = rcrtc->writeback.base.state;
-       if (!state || !state->writeback_job || !state->writeback_job->fb)
+       if (!state || !state->writeback_job)
                return;
 
        fb = state->writeback_job->fb;

diff --git a/drivers/gpu/drm/vc4/vc4_txp.c b/drivers/gpu/drm/vc4/vc4_txp.c
index 96f91c1..e92fa12 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_txp.c
+++ b/drivers/gpu/drm/vc4/vc4_txp.c
@@ -229,7 +229,7 @@ static int vc4_txp_connector_atomic_check(struct drm_connector *conn,
        int i;
 
        conn_state = drm_atomic_get_new_connector_state(state, conn);
-       if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
+       if (!conn_state->writeback_job)
                return 0;
 
        crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
@@ -269,8 +269,7 @@ static void vc4_txp_connector_atomic_commit(struct drm_connector *conn,
        u32 ctrl;
        int i;
 
-       if (WARN_ON(!conn_state->writeback_job ||
-                   !conn_state->writeback_job->fb))
+       if (WARN_ON(!conn_state->writeback_job))
                return;
 
        mode = &conn_state->crtc->state->adjusted_mode;