From the comments of drm_for_each_connector_iter(), we know
that "connector is only valid within the list body, if you want to use connector after calling drm_connector_list_iter_end() then you need to grab your own reference first using drm_connector_get()". So fix the wrong use of connector according to the comments and then call drm_connector_put() after using connector finishes.
Signed-off-by: He Ying heying24@huawei.com --- drivers/gpu/drm/sun4i/sun4i_tcon.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index 9f06dec0fc61..24fa6784ee5f 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -47,12 +47,12 @@ static struct drm_connector *sun4i_tcon_get_connector(const struct drm_encoder * drm_connector_list_iter_begin(encoder->dev, &iter); drm_for_each_connector_iter(connector, &iter) if (connector->encoder == encoder) { - drm_connector_list_iter_end(&iter); - return connector; + drm_connector_get(connector); + break; } drm_connector_list_iter_end(&iter);
- return NULL; + return connector; }
static int sun4i_tcon_get_pixel_depth(const struct drm_encoder *encoder) @@ -65,6 +65,7 @@ static int sun4i_tcon_get_pixel_depth(const struct drm_encoder *encoder) return -EINVAL;
info = &connector->display_info; + drm_connector_put(connector); if (info->num_bus_formats != 1) return -EINVAL;
@@ -361,6 +362,7 @@ static void sun4i_tcon0_mode_set_cpu(struct sun4i_tcon *tcon, /* TODO support normal CPU interface modes */ struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder); struct mipi_dsi_device *device = dsi->device; + struct drm_connector *connector; u8 bpp = mipi_dsi_pixel_format_to_bpp(device->format); u8 lanes = device->lanes; u32 block_space, start_delay; @@ -372,7 +374,9 @@ static void sun4i_tcon0_mode_set_cpu(struct sun4i_tcon *tcon, sun4i_tcon0_mode_set_common(tcon, mode);
/* Set dithering if needed */ - sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder)); + connector = sun4i_tcon_get_connector(encoder); + sun4i_tcon0_mode_set_dithering(tcon, connector); + drm_connector_put(connector);
regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG, SUN4I_TCON0_CTL_IF_MASK, @@ -430,6 +434,7 @@ static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon, const struct drm_display_mode *mode) { unsigned int bp; + struct drm_connector *connector; u8 clk_delay; u32 reg, val = 0;
@@ -440,7 +445,9 @@ static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon, sun4i_tcon0_mode_set_common(tcon, mode);
/* Set dithering if needed */ - sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder)); + connector = sun4i_tcon_get_connector(encoder); + sun4i_tcon0_mode_set_dithering(tcon, connector); + drm_connector_put(connector);
/* Adjust clock delay */ clk_delay = sun4i_tcon_get_clk_delay(mode, 0); @@ -518,6 +525,7 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
/* Set dithering if needed */ sun4i_tcon0_mode_set_dithering(tcon, connector); + drm_connector_put(connector);
/* Adjust clock delay */ clk_delay = sun4i_tcon_get_clk_delay(mode, 0);