Hi Chen, url: https://github.com/0day-ci/linux/commits/Chen-Li/drm-amdgpu-radeon-fix-memset-on-io-mem/20201216-165835 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git d01e7f10dae29eba0f9ada82b65d24e035d5b2f9 config: x86_64-randconfig-m001-20201216 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> New smatch warnings: drivers/gpu/drm/radeon/radeon_uvd.c:805 radeon_uvd_get_create_msg() error: uninitialized symbol 'i'. drivers/gpu/drm/radeon/radeon_uvd.c:833 radeon_uvd_get_destroy_msg() error: uninitialized symbol 'i'. Old smatch warnings: drivers/gpu/drm/radeon/radeon_uvd.c:568 radeon_uvd_cs_msg() warn: ignoring unreachable code. vim +/i +805 drivers/gpu/drm/radeon/radeon_uvd.c f2ba57b5eab8817 Christian König 2013-04-08 777 int radeon_uvd_get_create_msg(struct radeon_device *rdev, int ring, f2ba57b5eab8817 Christian König 2013-04-08 778 uint32_t handle, struct radeon_fence **fence) f2ba57b5eab8817 Christian König 2013-04-08 779 { feba9b0bcf492ba Christian König 2014-08-22 780 /* we use the last page of the vcpu bo for the UVD message */ feba9b0bcf492ba Christian König 2014-08-22 781 uint64_t offs = radeon_bo_size(rdev->uvd.vcpu_bo) - feba9b0bcf492ba Christian König 2014-08-22 782 RADEON_GPU_PAGE_SIZE; f2ba57b5eab8817 Christian König 2013-04-08 783 feba9b0bcf492ba Christian König 2014-08-22 784 uint32_t *msg = rdev->uvd.cpu_addr + offs; feba9b0bcf492ba Christian König 2014-08-22 785 uint64_t addr = rdev->uvd.gpu_addr + offs; f2ba57b5eab8817 Christian König 2013-04-08 786 feba9b0bcf492ba Christian König 2014-08-22 787 int r, i; f2ba57b5eab8817 Christian König 2013-04-08 788 feba9b0bcf492ba Christian König 2014-08-22 789 r = radeon_bo_reserve(rdev->uvd.vcpu_bo, true); feba9b0bcf492ba Christian König 2014-08-22 790 if (r) f2ba57b5eab8817 Christian König 2013-04-08 791 return r; f2ba57b5eab8817 Christian König 2013-04-08 792 f2ba57b5eab8817 Christian König 2013-04-08 793 /* stitch together an UVD create msg */ 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 794 msg[0] = cpu_to_le32(0x00000de4); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 795 msg[1] = cpu_to_le32(0x00000000); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 796 msg[2] = cpu_to_le32(handle); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 797 msg[3] = cpu_to_le32(0x00000000); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 798 msg[4] = cpu_to_le32(0x00000000); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 799 msg[5] = cpu_to_le32(0x00000000); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 800 msg[6] = cpu_to_le32(0x00000000); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 801 msg[7] = cpu_to_le32(0x00000780); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 802 msg[8] = cpu_to_le32(0x00000440); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 803 msg[9] = cpu_to_le32(0x00000000); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 804 msg[10] = cpu_to_le32(0x01b37000); 201257d71c519be Chen Li 2020-12-16 @805 memset_io(&msg[i], 0x0, 1013 * sizeof(uint32_t)); ^^^^^^^ The "i" variable is never initialized anywhere. f2ba57b5eab8817 Christian König 2013-04-08 806 feba9b0bcf492ba Christian König 2014-08-22 807 r = radeon_uvd_send_msg(rdev, ring, addr, fence); feba9b0bcf492ba Christian König 2014-08-22 808 radeon_bo_unreserve(rdev->uvd.vcpu_bo); feba9b0bcf492ba Christian König 2014-08-22 809 return r; f2ba57b5eab8817 Christian König 2013-04-08 810 } f2ba57b5eab8817 Christian König 2013-04-08 811 f2ba57b5eab8817 Christian König 2013-04-08 812 int radeon_uvd_get_destroy_msg(struct radeon_device *rdev, int ring, f2ba57b5eab8817 Christian König 2013-04-08 813 uint32_t handle, struct radeon_fence **fence) f2ba57b5eab8817 Christian König 2013-04-08 814 { feba9b0bcf492ba Christian König 2014-08-22 815 /* we use the last page of the vcpu bo for the UVD message */ feba9b0bcf492ba Christian König 2014-08-22 816 uint64_t offs = radeon_bo_size(rdev->uvd.vcpu_bo) - feba9b0bcf492ba Christian König 2014-08-22 817 RADEON_GPU_PAGE_SIZE; f2ba57b5eab8817 Christian König 2013-04-08 818 feba9b0bcf492ba Christian König 2014-08-22 819 uint32_t *msg = rdev->uvd.cpu_addr + offs; feba9b0bcf492ba Christian König 2014-08-22 820 uint64_t addr = rdev->uvd.gpu_addr + offs; f2ba57b5eab8817 Christian König 2013-04-08 821 feba9b0bcf492ba Christian König 2014-08-22 822 int r, i; f2ba57b5eab8817 Christian König 2013-04-08 823 feba9b0bcf492ba Christian König 2014-08-22 824 r = radeon_bo_reserve(rdev->uvd.vcpu_bo, true); feba9b0bcf492ba Christian König 2014-08-22 825 if (r) f2ba57b5eab8817 Christian König 2013-04-08 826 return r; f2ba57b5eab8817 Christian König 2013-04-08 827 f2ba57b5eab8817 Christian König 2013-04-08 828 /* stitch together an UVD destroy msg */ 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 829 msg[0] = cpu_to_le32(0x00000de4); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 830 msg[1] = cpu_to_le32(0x00000002); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 831 msg[2] = cpu_to_le32(handle); 9b1be4dc02bb6b9 Alex Deucher 2013-06-07 832 msg[3] = cpu_to_le32(0x00000000); 201257d71c519be Chen Li 2020-12-16 @833 memset_io(&msg[i], 0x0, 1020 * sizeof(uint32_t)); ^^^^^^^ Same f2ba57b5eab8817 Christian König 2013-04-08 834 feba9b0bcf492ba Christian König 2014-08-22 835 r = radeon_uvd_send_msg(rdev, ring, addr, fence); feba9b0bcf492ba Christian König 2014-08-22 836 radeon_bo_unreserve(rdev->uvd.vcpu_bo); feba9b0bcf492ba Christian König 2014-08-22 837 return r; f2ba57b5eab8817 Christian König 2013-04-08 838 } 55b51c88c5167ba Christian König 2013-04-18 839 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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