The code on line 462 looks suspicious.

---------- Forwarded message ---------- Date: Fri, 31 Jan 2020 16:56:26 +0800 From: kbuild test robot <lkp(a)intel.com&gt; To: kbuild(a)lists.01.org Cc: Julia Lawall <julia.lawall(a)lip6.fr&gt; Subject: [lee:android-3.18-preview 136/224] drivers/media/radio/si470x/radio-si470x-i2c.c:462:25-30: ERROR: reference preceded by free on line 460 CC: kbuild-all(a)lists.01.org BCC: philip.li(a)intel.com TO: Lee Jones <lee.jones(a)linaro.org&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/lee/linux.git android-3.18-preview head: 356017eeb20d27b17d236ff6b31c0b7d24dff865 commit: 752c36757aa40c2f669d7da128aae237f9fd3318 [136/224] media: si470x-i2c: add missed operations in remove :::::: branch date: 18 hours ago :::::: commit date: 6 days ago If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; Reported-by: Julia Lawall <julia.lawall(a)lip6.fr&gt; >> drivers/media/radio/si470x/radio-si470x-i2c.c:462:25-30: ERROR: reference preceded by free on line 460 # https://git.kernel.org/pub/scm/linux/kernel/git/lee/linux.git/commit/?id=... git remote add lee https://git.kernel.org/pub/scm/linux/kernel/git/lee/linux.git git remote update lee git checkout 752c36757aa40c2f669d7da128aae237f9fd3318 vim +462 drivers/media/radio/si470x/radio-si470x-i2c.c cc35bbddfe10f7 Joonyoung Shim 2009-08-09 449 9dcb79c2eedb5b Tobias Lorenz 2009-08-10 450 9dcb79c2eedb5b Tobias Lorenz 2009-08-10 451 /* 9dcb79c2eedb5b Tobias Lorenz 2009-08-10 452 * si470x_i2c_remove - remove the device 9dcb79c2eedb5b Tobias Lorenz 2009-08-10 453 */ 4c62e9764ab403 Greg Kroah-Hartman 2012-12-21 454 static int si470x_i2c_remove(struct i2c_client *client) cc35bbddfe10f7 Joonyoung Shim 2009-08-09 455 { cc35bbddfe10f7 Joonyoung Shim 2009-08-09 456 struct si470x_device *radio = i2c_get_clientdata(client); cc35bbddfe10f7 Joonyoung Shim 2009-08-09 457 fe2137dd4e6e4b Joonyoung Shim 2009-12-10 458 free_irq(client->irq, radio); 4967d53dbbcebf Hans Verkuil 2012-05-04 459 video_unregister_device(&radio->videodev); cc35bbddfe10f7 Joonyoung Shim 2009-08-09 @460 kfree(radio); cc35bbddfe10f7 Joonyoung Shim 2009-08-09 461 752c36757aa40c Chuhong Yuan 2019-11-10 @462 v4l2_ctrl_handler_free(&radio->hdl); 752c36757aa40c Chuhong Yuan 2019-11-10 463 v4l2_device_unregister(&radio->v4l2_dev); cc35bbddfe10f7 Joonyoung Shim 2009-08-09 464 return 0; cc35bbddfe10f7 Joonyoung Shim 2009-08-09 465 } cc35bbddfe10f7 Joonyoung Shim 2009-08-09 466 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation