Hi, I love your patch! Perhaps something to improve: [auto build test WARNING on linuxtv-media/master] [cannot apply to v5.3-rc7 next-20190904] [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/dongchun-zhu-mediatek-com/media-i2c-Add-support-for-OV02A10-sensor/20190908-065643 base: git://linuxtv.org/media_tree.git master config: x86_64-allyesconfig (attached as .config) compiler: gcc-7 (Debian 7.4.0-11) 7.4.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> 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/media/i2c/ov02a10.c: In function 'ov02a10_set_ctrl': >> drivers/media/i2c/ov02a10.c:699:9: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized] return ret; ^~~ vim +/ret +699 drivers/media/i2c/ov02a10.c 658 659 static int ov02a10_set_ctrl(struct v4l2_ctrl *ctrl) 660 { 661 struct ov02a10 *ov02a10 = container_of(ctrl->handler, 662 struct ov02a10, ctrl_handler); 663 struct i2c_client *client = v4l2_get_subdevdata(&ov02a10->subdev); 664 s64 max_expo; 665 int ret; 666 667 /* Propagate change of current control to all related controls */ 668 if (ctrl->id == V4L2_CID_VBLANK) { 669 /* Update max exposure while meeting expected vblanking */ 670 max_expo = ov02a10->cur_mode->height + ctrl->val - 671 OV02A10_EXPOSURE_MAX_MARGIN; 672 __v4l2_ctrl_modify_range(ov02a10->exposure, 673 ov02a10->exposure->minimum, max_expo, 674 ov02a10->exposure->step, 675 ov02a10->exposure->default_value); 676 } 677 678 /* V4L2 controls values will be applied only when power is already up */ 679 if (!pm_runtime_get_if_in_use(&client->dev)) 680 return 0; 681 682 switch (ctrl->id) { 683 case V4L2_CID_EXPOSURE: 684 ret = ov02a10_set_exposure(ov02a10, ctrl->val); 685 break; 686 case V4L2_CID_ANALOGUE_GAIN: 687 ret = ov02a10_set_gain(ov02a10, ctrl->val); 688 break; 689 case V4L2_CID_VBLANK: 690 ret = ov02a10_set_vblank(ov02a10, ctrl->val); 691 break; 692 case V4L2_CID_TEST_PATTERN: 693 ret = ov02a10_set_test_pattern(ov02a10, ctrl->val); 694 break; 695 }; 696 697 pm_runtime_put(&client->dev); 698 > 699 return ret; 700 } 701 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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