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 df6d0079d0af0a1f0c59cfc5f51daeab75c6d4bd..11d06c7b5afa5589ae188b7daef7dec177047512 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -755,6 +755,10 @@ 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);
@@ -794,6 +798,7 @@ 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);