Hi Rob, https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Rob-Clark/drm-msm-Pre-allocate-hw_fence/20230320-224826 base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next patch link: https://lore.kernel.org/r/20230320144356.803762-19-robdclark%40gmail.com patch subject: [PATCH v2 18/23] PM / QoS: Decouple request alloc from dev_pm_qos_mtx config: arm64-randconfig-m041-20230319 (https://download.01.org/0day-ci/archive/20230321/202303211207.mUCSt3CK-lkp@xxxxxxxxx/config) compiler: aarch64-linux-gcc (GCC) 12.1.0 If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Reported-by: Dan Carpenter <error27@xxxxxxxxx> | Link: https://lore.kernel.org/r/202303211207.mUCSt3CK-lkp@xxxxxxxxx/ smatch warnings: drivers/base/power/qos.c:947 dev_pm_qos_update_user_latency_tolerance() error: uninitialized symbol 'req'. drivers/base/power/qos.c:975 dev_pm_qos_update_user_latency_tolerance() warn: possible memory leak of 'req' vim +/req +947 drivers/base/power/qos.c 2d984ad132a87c Rafael J. Wysocki 2014-02-11 923 int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val) 2d984ad132a87c Rafael J. Wysocki 2014-02-11 924 { 2d7e4629d7265d Rob Clark 2023-03-20 925 struct dev_pm_qos_request *req = NULL; 2d984ad132a87c Rafael J. Wysocki 2014-02-11 926 int ret; 2d984ad132a87c Rafael J. Wysocki 2014-02-11 927 00dd582e52a535 Rob Clark 2023-03-20 928 ret = dev_pm_qos_constraints_ensure_allocated(dev); 00dd582e52a535 Rob Clark 2023-03-20 929 if (ret) 00dd582e52a535 Rob Clark 2023-03-20 930 return ret; 00dd582e52a535 Rob Clark 2023-03-20 931 2d7e4629d7265d Rob Clark 2023-03-20 932 if (!dev->power.qos->latency_tolerance_req) 2d7e4629d7265d Rob Clark 2023-03-20 933 req = kzalloc(sizeof(*req), GFP_KERNEL); 2d7e4629d7265d Rob Clark 2023-03-20 934 2d984ad132a87c Rafael J. Wysocki 2014-02-11 935 mutex_lock(&dev_pm_qos_mtx); 2d984ad132a87c Rafael J. Wysocki 2014-02-11 936 00dd582e52a535 Rob Clark 2023-03-20 937 if (!dev->power.qos->latency_tolerance_req) { 2d984ad132a87c Rafael J. Wysocki 2014-02-11 938 struct dev_pm_qos_request *req; This "req" shadows the ealier req. 2d984ad132a87c Rafael J. Wysocki 2014-02-11 939 2d984ad132a87c Rafael J. Wysocki 2014-02-11 940 if (val < 0) { 80a6f7c79b7822 Andrew Lutomirski 2016-11-29 941 if (val == PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT) 80a6f7c79b7822 Andrew Lutomirski 2016-11-29 942 ret = 0; 80a6f7c79b7822 Andrew Lutomirski 2016-11-29 943 else 2d984ad132a87c Rafael J. Wysocki 2014-02-11 944 ret = -EINVAL; 2d984ad132a87c Rafael J. Wysocki 2014-02-11 945 goto out; 2d984ad132a87c Rafael J. Wysocki 2014-02-11 946 } 2d984ad132a87c Rafael J. Wysocki 2014-02-11 @947 if (!req) { So it leads to an unintialized variable and a leak. 2d984ad132a87c Rafael J. Wysocki 2014-02-11 948 ret = -ENOMEM; 2d984ad132a87c Rafael J. Wysocki 2014-02-11 949 goto out; 2d984ad132a87c Rafael J. Wysocki 2014-02-11 950 } 2d984ad132a87c Rafael J. Wysocki 2014-02-11 951 ret = __dev_pm_qos_add_request(dev, req, DEV_PM_QOS_LATENCY_TOLERANCE, val); 2d984ad132a87c Rafael J. Wysocki 2014-02-11 952 if (ret < 0) { 2d984ad132a87c Rafael J. Wysocki 2014-02-11 953 kfree(req); 2d984ad132a87c Rafael J. Wysocki 2014-02-11 954 goto out; 2d984ad132a87c Rafael J. Wysocki 2014-02-11 955 } 2d984ad132a87c Rafael J. Wysocki 2014-02-11 956 dev->power.qos->latency_tolerance_req = req; 2d984ad132a87c Rafael J. Wysocki 2014-02-11 957 } else { 2d7e4629d7265d Rob Clark 2023-03-20 958 /* 2d7e4629d7265d Rob Clark 2023-03-20 959 * If we raced with another thread to allocate the request, 2d7e4629d7265d Rob Clark 2023-03-20 960 * simply free the redundant allocation and move on. 2d7e4629d7265d Rob Clark 2023-03-20 961 */ 2d7e4629d7265d Rob Clark 2023-03-20 962 if (req) 2d7e4629d7265d Rob Clark 2023-03-20 963 kfree(req); 2d7e4629d7265d Rob Clark 2023-03-20 964 2d984ad132a87c Rafael J. Wysocki 2014-02-11 965 if (val < 0) { 2d984ad132a87c Rafael J. Wysocki 2014-02-11 966 __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY_TOLERANCE); 2d984ad132a87c Rafael J. Wysocki 2014-02-11 967 ret = 0; 2d984ad132a87c Rafael J. Wysocki 2014-02-11 968 } else { 2d984ad132a87c Rafael J. Wysocki 2014-02-11 969 ret = __dev_pm_qos_update_request(dev->power.qos->latency_tolerance_req, val); 2d984ad132a87c Rafael J. Wysocki 2014-02-11 970 } 2d984ad132a87c Rafael J. Wysocki 2014-02-11 971 } 2d984ad132a87c Rafael J. Wysocki 2014-02-11 972 2d984ad132a87c Rafael J. Wysocki 2014-02-11 973 out: 2d984ad132a87c Rafael J. Wysocki 2014-02-11 974 mutex_unlock(&dev_pm_qos_mtx); 2d984ad132a87c Rafael J. Wysocki 2014-02-11 @975 return ret; 2d984ad132a87c Rafael J. Wysocki 2014-02-11 976 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
