Hi Udipto, kernel test robot noticed the following build warnings: https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Udipto-Goswami/usb-dwc3-debugfs-Prevent-any-register-access-when-devices-is-runtime-suspended/20230504-125225 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing patch link: https://lore.kernel.org/r/20230504045052.22347-1-quic_ugoswami%40quicinc.com patch subject: [PATCH v8] usb: dwc3: debugfs: Prevent any register access when devices is runtime suspended config: x86_64-randconfig-m001 (https://download.01.org/0day-ci/archive/20230510/202305101451.V2D0cM4S-lkp@xxxxxxxxx/config) compiler: gcc-11 (Debian 11.3.0-12) 11.3.0 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/202305101451.V2D0cM4S-lkp@xxxxxxxxx/ New smatch warnings: drivers/usb/dwc3/debugfs.c:647 dwc3_link_state_write() warn: missing error code? 'ret' drivers/usb/dwc3/debugfs.c:720 dwc3_rx_fifo_size_show() warn: curly braces intended? drivers/usb/dwc3/debugfs.c:722 dwc3_rx_fifo_size_show() warn: inconsistent indenting drivers/usb/dwc3/debugfs.c:722 dwc3_rx_fifo_size_show() warn: ignoring unreachable code. Old smatch warnings: drivers/usb/dwc3/debugfs.c:657 dwc3_link_state_write() warn: missing error code? 'ret' vim +/ret +647 drivers/usb/dwc3/debugfs.c 1c53edaeee3338 Udipto Goswami 2023-05-04 638 ret = pm_runtime_resume_and_get(dwc->dev); 1c53edaeee3338 Udipto Goswami 2023-05-04 639 if (ret < 0) 1c53edaeee3338 Udipto Goswami 2023-05-04 640 return ret; 1c53edaeee3338 Udipto Goswami 2023-05-04 641 138801aaa566ec Felipe Balbi 2012-01-02 642 spin_lock_irqsave(&dwc->lock, flags); d102444cac1564 Thinh Nguyen 2018-11-07 643 reg = dwc3_readl(dwc->regs, DWC3_GSTS); d102444cac1564 Thinh Nguyen 2018-11-07 644 if (DWC3_GSTS_CURMOD(reg) != DWC3_GSTS_CURMOD_DEVICE) { d102444cac1564 Thinh Nguyen 2018-11-07 645 spin_unlock_irqrestore(&dwc->lock, flags); 1c53edaeee3338 Udipto Goswami 2023-05-04 646 pm_runtime_put_sync(dwc->dev); 1c53edaeee3338 Udipto Goswami 2023-05-04 @647 return ret; ret is not necessarily an error code. d102444cac1564 Thinh Nguyen 2018-11-07 648 } d102444cac1564 Thinh Nguyen 2018-11-07 649 0d36dede457873 Thinh Nguyen 2018-11-07 650 reg = dwc3_readl(dwc->regs, DWC3_DSTS); 0d36dede457873 Thinh Nguyen 2018-11-07 651 speed = reg & DWC3_DSTS_CONNECTSPD; 0d36dede457873 Thinh Nguyen 2018-11-07 652 0d36dede457873 Thinh Nguyen 2018-11-07 653 if (speed < DWC3_DSTS_SUPERSPEED && 0d36dede457873 Thinh Nguyen 2018-11-07 654 state != DWC3_LINK_STATE_RECOV) { 0d36dede457873 Thinh Nguyen 2018-11-07 655 spin_unlock_irqrestore(&dwc->lock, flags); 1c53edaeee3338 Udipto Goswami 2023-05-04 656 pm_runtime_put_sync(dwc->dev); 1c53edaeee3338 Udipto Goswami 2023-05-04 657 return ret; 0d36dede457873 Thinh Nguyen 2018-11-07 658 } [ snip ] 2c85a1817e4ba0 Thinh Nguyen 2018-11-07 708 static int dwc3_rx_fifo_size_show(struct seq_file *s, void *unused) 818ec3aba883f5 Felipe Balbi 2016-04-14 709 { 818ec3aba883f5 Felipe Balbi 2016-04-14 710 struct dwc3_ep *dep = s->private; 818ec3aba883f5 Felipe Balbi 2016-04-14 711 struct dwc3 *dwc = dep->dwc; 818ec3aba883f5 Felipe Balbi 2016-04-14 712 unsigned long flags; d00be779cc5016 Thinh Nguyen 2021-03-27 713 u32 mdwidth; 818ec3aba883f5 Felipe Balbi 2016-04-14 714 u32 val; 1c53edaeee3338 Udipto Goswami 2023-05-04 715 int ret; 1c53edaeee3338 Udipto Goswami 2023-05-04 716 1c53edaeee3338 Udipto Goswami 2023-05-04 717 ret = pm_runtime_resume_and_get(dwc->dev); 1c53edaeee3338 Udipto Goswami 2023-05-04 718 if (ret < 0) 1c53edaeee3338 Udipto Goswami 2023-05-04 719 pm_runtime_put_sync(dwc->dev); 1c53edaeee3338 Udipto Goswami 2023-05-04 @720 return ret; Needs curly braces. 818ec3aba883f5 Felipe Balbi 2016-04-14 721 818ec3aba883f5 Felipe Balbi 2016-04-14 @722 spin_lock_irqsave(&dwc->lock, flags); 2c85a1817e4ba0 Thinh Nguyen 2018-11-07 723 val = dwc3_core_fifo_space(dep, DWC3_RXFIFO); 0f874f79dc81ae Thinh Nguyen 2018-11-07 724 0f874f79dc81ae Thinh Nguyen 2018-11-07 725 /* Convert to bytes */ d00be779cc5016 Thinh Nguyen 2021-03-27 726 mdwidth = dwc3_mdwidth(dwc); 4244ba02edb850 Thinh Nguyen 2020-04-11 727 4244ba02edb850 Thinh Nguyen 2020-04-11 728 val *= mdwidth; 0f874f79dc81ae Thinh Nguyen 2018-11-07 729 val >>= 3; 818ec3aba883f5 Felipe Balbi 2016-04-14 730 seq_printf(s, "%u\n", val); 818ec3aba883f5 Felipe Balbi 2016-04-14 731 spin_unlock_irqrestore(&dwc->lock, flags); 818ec3aba883f5 Felipe Balbi 2016-04-14 732 1c53edaeee3338 Udipto Goswami 2023-05-04 733 pm_runtime_put_sync(dwc->dev); 818ec3aba883f5 Felipe Balbi 2016-04-14 734 return 0; 818ec3aba883f5 Felipe Balbi 2016-04-14 735 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
