Hi Ville, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on drm/drm-next] [also build test WARNING on v4.18-rc2 next-20180626] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Ville-Syrjala/drm-Second-attempt-at-fixing-the-fb-helper-best_encoder-mess/20180627-024018 base: git://people.freedesktop.org/~airlied/linux.git drm-next config: x86_64-randconfig-x012-201825 (attached as .config) compiler: gcc-7 (Debian 7.3.0-16) 7.3.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/gpu//drm/nouveau/nouveau_connector.c: In function 'nouveau_connector_detect': >> drivers/gpu//drm/nouveau/nouveau_connector.c:606:33: warning: 'nv_encoder' may be used uninitialized in this function [-Wmaybe-uninitialized] if (nv_partner && ((nv_encoder->dcb->type == DCB_OUTPUT_ANALOG && ~~~~~~~~~~^~~~~ vim +/nv_encoder +606 drivers/gpu//drm/nouveau/nouveau_connector.c 6ee73861 Ben Skeggs 2009-12-11 546 6ee73861 Ben Skeggs 2009-12-11 547 static enum drm_connector_status 930a9e28 Chris Wilson 2010-09-14 548 nouveau_connector_detect(struct drm_connector *connector, bool force) 6ee73861 Ben Skeggs 2009-12-11 549 { 6ee73861 Ben Skeggs 2009-12-11 550 struct drm_device *dev = connector->dev; 77145f1c Ben Skeggs 2012-07-31 551 struct nouveau_drm *drm = nouveau_drm(dev); 6ee73861 Ben Skeggs 2009-12-11 552 struct nouveau_connector *nv_connector = nouveau_connector(connector); 6ee73861 Ben Skeggs 2009-12-11 553 struct nouveau_encoder *nv_encoder = NULL; e19b20bb Ben Skeggs 2011-07-12 554 struct nouveau_encoder *nv_partner; 2aa5eac5 Ben Skeggs 2015-08-20 555 struct i2c_adapter *i2c; 03cd06ca Francisco Jerez 2010-07-20 556 int type; 5addcf0a Dave Airlie 2012-09-10 557 int ret; 5addcf0a Dave Airlie 2012-09-10 558 enum drm_connector_status conn_status = connector_status_disconnected; 6ee73861 Ben Skeggs 2009-12-11 559 b8780e2a Francisco Jerez 2010-01-14 560 /* Cleanup the previous EDID block. */ b8780e2a Francisco Jerez 2010-01-14 561 if (nv_connector->edid) { b8780e2a Francisco Jerez 2010-01-14 562 drm_mode_connector_update_edid_property(connector, NULL); c8ebe275 Xavier Chantry 2010-01-11 563 kfree(nv_connector->edid); c8ebe275 Xavier Chantry 2010-01-11 564 nv_connector->edid = NULL; b8780e2a Francisco Jerez 2010-01-14 565 } c8ebe275 Xavier Chantry 2010-01-11 566 d61a5c10 Lukas Wunner 2018-02-11 567 /* Outputs are only polled while runtime active, so acquiring a d61a5c10 Lukas Wunner 2018-02-11 568 * runtime PM ref here is unnecessary (and would deadlock upon d61a5c10 Lukas Wunner 2018-02-11 569 * runtime suspend because it waits for polling to finish). d61a5c10 Lukas Wunner 2018-02-11 570 */ d61a5c10 Lukas Wunner 2018-02-11 571 if (!drm_kms_helper_is_poll_worker()) { 5addcf0a Dave Airlie 2012-09-10 572 ret = pm_runtime_get_sync(connector->dev->dev); b6c4285a Alexandre Courbot 2014-02-12 573 if (ret < 0 && ret != -EACCES) 5addcf0a Dave Airlie 2012-09-10 574 return conn_status; d61a5c10 Lukas Wunner 2018-02-11 575 } 5addcf0a Dave Airlie 2012-09-10 576 8777c5c1 Ben Skeggs 2014-06-06 577 nv_encoder = nouveau_connector_ddc_detect(connector); 8777c5c1 Ben Skeggs 2014-06-06 578 if (nv_encoder && (i2c = nv_encoder->i2c) != NULL) { 39c1c901 Lukas Wunner 2016-01-11 579 if ((vga_switcheroo_handler_flags() & 39c1c901 Lukas Wunner 2016-01-11 580 VGA_SWITCHEROO_CAN_SWITCH_DDC) && 39c1c901 Lukas Wunner 2016-01-11 581 nv_connector->type == DCB_CONNECTOR_LVDS) 39c1c901 Lukas Wunner 2016-01-11 582 nv_connector->edid = drm_get_edid_switcheroo(connector, 39c1c901 Lukas Wunner 2016-01-11 583 i2c); 39c1c901 Lukas Wunner 2016-01-11 584 else 2aa5eac5 Ben Skeggs 2015-08-20 585 nv_connector->edid = drm_get_edid(connector, i2c); 39c1c901 Lukas Wunner 2016-01-11 586 6ee73861 Ben Skeggs 2009-12-11 587 drm_mode_connector_update_edid_property(connector, 6ee73861 Ben Skeggs 2009-12-11 588 nv_connector->edid); 6ee73861 Ben Skeggs 2009-12-11 589 if (!nv_connector->edid) { 77145f1c Ben Skeggs 2012-07-31 590 NV_ERROR(drm, "DDC responded, but no EDID for %s\n", 8c6c361a Jani Nikula 2014-06-03 591 connector->name); 0ed3165e Francisco Jerez 2010-01-14 592 goto detect_analog; 6ee73861 Ben Skeggs 2009-12-11 593 } 6ee73861 Ben Skeggs 2009-12-11 594 6ee73861 Ben Skeggs 2009-12-11 595 /* Override encoder type for DVI-I based on whether EDID 6ee73861 Ben Skeggs 2009-12-11 596 * says the display is digital or analog, both use the 6ee73861 Ben Skeggs 2009-12-11 597 * same i2c channel so the value returned from ddc_detect 6ee73861 Ben Skeggs 2009-12-11 598 * isn't necessarily correct. 6ee73861 Ben Skeggs 2009-12-11 599 */ e19b20bb Ben Skeggs 2011-07-12 600 nv_partner = NULL; cb75d97e Ben Skeggs 2012-07-11 601 if (nv_encoder->dcb->type == DCB_OUTPUT_TMDS) cb75d97e Ben Skeggs 2012-07-11 602 nv_partner = find_encoder(connector, DCB_OUTPUT_ANALOG); cb75d97e Ben Skeggs 2012-07-11 603 if (nv_encoder->dcb->type == DCB_OUTPUT_ANALOG) cb75d97e Ben Skeggs 2012-07-11 604 nv_partner = find_encoder(connector, DCB_OUTPUT_TMDS); cb75d97e Ben Skeggs 2012-07-11 605 cb75d97e Ben Skeggs 2012-07-11 @606 if (nv_partner && ((nv_encoder->dcb->type == DCB_OUTPUT_ANALOG && cb75d97e Ben Skeggs 2012-07-11 607 nv_partner->dcb->type == DCB_OUTPUT_TMDS) || cb75d97e Ben Skeggs 2012-07-11 608 (nv_encoder->dcb->type == DCB_OUTPUT_TMDS && cb75d97e Ben Skeggs 2012-07-11 609 nv_partner->dcb->type == DCB_OUTPUT_ANALOG))) { 6ee73861 Ben Skeggs 2009-12-11 610 if (nv_connector->edid->input & DRM_EDID_INPUT_DIGITAL) cb75d97e Ben Skeggs 2012-07-11 611 type = DCB_OUTPUT_TMDS; 6ee73861 Ben Skeggs 2009-12-11 612 else cb75d97e Ben Skeggs 2012-07-11 613 type = DCB_OUTPUT_ANALOG; 6ee73861 Ben Skeggs 2009-12-11 614 e19b20bb Ben Skeggs 2011-07-12 615 nv_encoder = find_encoder(connector, type); 6ee73861 Ben Skeggs 2009-12-11 616 } 6ee73861 Ben Skeggs 2009-12-11 617 6ee73861 Ben Skeggs 2009-12-11 618 nouveau_connector_set_encoder(connector, nv_encoder); 5addcf0a Dave Airlie 2012-09-10 619 conn_status = connector_status_connected; 5addcf0a Dave Airlie 2012-09-10 620 goto out; 6ee73861 Ben Skeggs 2009-12-11 621 } 6ee73861 Ben Skeggs 2009-12-11 622 c16c5707 Francisco Jerez 2010-09-09 623 nv_encoder = nouveau_connector_of_detect(connector); c16c5707 Francisco Jerez 2010-09-09 624 if (nv_encoder) { c16c5707 Francisco Jerez 2010-09-09 625 nouveau_connector_set_encoder(connector, nv_encoder); 5addcf0a Dave Airlie 2012-09-10 626 conn_status = connector_status_connected; 5addcf0a Dave Airlie 2012-09-10 627 goto out; c16c5707 Francisco Jerez 2010-09-09 628 } c16c5707 Francisco Jerez 2010-09-09 629 0ed3165e Francisco Jerez 2010-01-14 630 detect_analog: cb75d97e Ben Skeggs 2012-07-11 631 nv_encoder = find_encoder(connector, DCB_OUTPUT_ANALOG); f4053509 Ben Skeggs 2010-03-15 632 if (!nv_encoder && !nouveau_tv_disable) cb75d97e Ben Skeggs 2012-07-11 633 nv_encoder = find_encoder(connector, DCB_OUTPUT_TV); 84b8081c Francisco Jerez 2010-10-26 634 if (nv_encoder && force) { 6ee73861 Ben Skeggs 2009-12-11 635 struct drm_encoder *encoder = to_drm_encoder(nv_encoder); d58ded76 Jani Nikula 2015-03-11 636 const struct drm_encoder_helper_funcs *helper = 6ee73861 Ben Skeggs 2009-12-11 637 encoder->helper_private; 6ee73861 Ben Skeggs 2009-12-11 638 6ee73861 Ben Skeggs 2009-12-11 639 if (helper->detect(encoder, connector) == 6ee73861 Ben Skeggs 2009-12-11 640 connector_status_connected) { 6ee73861 Ben Skeggs 2009-12-11 641 nouveau_connector_set_encoder(connector, nv_encoder); 5addcf0a Dave Airlie 2012-09-10 642 conn_status = connector_status_connected; 5addcf0a Dave Airlie 2012-09-10 643 goto out; 6ee73861 Ben Skeggs 2009-12-11 644 } 6ee73861 Ben Skeggs 2009-12-11 645 6ee73861 Ben Skeggs 2009-12-11 646 } 6ee73861 Ben Skeggs 2009-12-11 647 5addcf0a Dave Airlie 2012-09-10 648 out: 5addcf0a Dave Airlie 2012-09-10 649 d61a5c10 Lukas Wunner 2018-02-11 650 if (!drm_kms_helper_is_poll_worker()) { 5addcf0a Dave Airlie 2012-09-10 651 pm_runtime_mark_last_busy(connector->dev->dev); 5addcf0a Dave Airlie 2012-09-10 652 pm_runtime_put_autosuspend(connector->dev->dev); d61a5c10 Lukas Wunner 2018-02-11 653 } 5addcf0a Dave Airlie 2012-09-10 654 5addcf0a Dave Airlie 2012-09-10 655 return conn_status; 6ee73861 Ben Skeggs 2009-12-11 656 } 6ee73861 Ben Skeggs 2009-12-11 657 :::::: The code at line 606 was first introduced by commit :::::: cb75d97e9c77743ecfcc43375be135a55a4d9b25 drm/nouveau: implement devinit subdev, and new init table parser :::::: TO: Ben Skeggs <bskeggs@xxxxxxxxxx> :::::: CC: Ben Skeggs <bskeggs@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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