drm/radeon: avoid leaking edid data

commit 0ac66effe7fcdee55bda6d5d10d3372c95a41920 upstream.

In some cases we fetch the edid in the detect() callback
in order to determine what sort of monitor is connected.
If that happens, don't fetch the edid again in the get_modes()
callback or we will leak the edid.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 60404f4..adc9bfd 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -709,6 +709,10 @@ int radeon_ddc_get_modes(struct radeon_connector *radeon_connector)
        struct radeon_device *rdev = dev->dev_private;
        int ret = 0;
 
+       /* don't leak the edid if we already fetched it in detect() */
+       if (radeon_connector->edid)
+               goto got_edid;
+
        /* on hw with routers, select right port */
        if (radeon_connector->router.ddc_valid)
                radeon_router_select_ddc_port(radeon_connector);
@@ -748,6 +752,7 @@ int radeon_ddc_get_modes(struct radeon_connector *radeon_connector)
                        radeon_connector->edid = radeon_bios_get_hardcoded_edid(rdev);
        }
        if (radeon_connector->edid) {
+got_edid:
                drm_mode_connector_update_edid_property(&radeon_connector->base, radeon_connector->edid);
                ret = drm_add_edid_modes(&radeon_connector->base, radeon_connector->edid);
                drm_edid_to_eld(&radeon_connector->base, radeon_connector->edid);