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rtl8723be hw_init() calls local_save_flags(flags) followed by local_irq_enable(). Later, local_irq_restore(flags) is called. This causes warnings from Lockdep on boot and modprobe, as local_irq_restore(flags) should only be called while irqs are disabled. The warning was introduced to detect this class of bug in [1]. With testing I found that all paths which call hw_init() have irqs already enabled for rtl8723be. Furthermore, the calls were originally added for the rtl8192ce in commitf78bccd79b("rtlwifi: rtl8192ce: Fix too long disable of IRQs") before later being added to most other rtlwifi drivers. Commitd3feae41a3("rtlwifi: Update power-save routines for 062814 driver") then replaces the call to spin_lock_irqsave() before hw_init(), and thus the codepath which caused irqs to be disabled in hw_init and prompted the original commit has been removed. The same irq save/restore pattern is also present in the hw_init() of rtl8192ce, rtl8723ae, rtl8188ee, rtl8192se and rtl8192cu, however I don't have the hardware to test them, so I did not include them in my changes. Tested on a Razer Blade 14 2017. Example of output from Lockdep prior to fix: raw_local_irq_restore() called with IRQs enabled ... Call Trace: <TASK> rtl8723be_hw_init+0x5992/0x7220 [rtl8723be] ? static_obj+0x61/0xa0 rtl_pci_start+0x222/0x5c0 [rtl_pci] rtl_op_start+0x128/0x1a0 [rtlwifi] ? __kasan_check_read+0x11/0x20 drv_start+0x16c/0x550 [mac80211] ... irq event stamp: 887679 hardirqs last enabled at (887689): [<ffffffff96511170>] __up_console_sem+0x90/0xa0 hardirqs last disabled at (887698): [<ffffffff96511155>] __up_console_sem+0x75/0xa0 softirqs last enabled at (887670): [<ffffffff962f4675>] __irq_exit_rcu+0x175/0x2f0 softirqs last disabled at (887649): [<ffffffff962f4675>] __irq_exit_rcu+0x175/0x2f0 ---[ end trace 0000000000000000 ]--- [1] https://lore.kernel.org/all/20210111153707.10071-1-mark.rutland@arm.com/ Signed-off-by: William Hansen-Baird <william.hansen.baird@gmail.com> Acked-by: Ping-Ke Shih <pkshih@realtek.com> Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Link: https://patch.msgid.link/20260609095359.2964193-1-william.hansen.baird@gmail.com
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Start your kernel development journey here: * Getting Started: Documentation/process/development-process.rst * Your First Patch: Documentation/process/submitting-patches.rst * Coding Style: Documentation/process/coding-style.rst * Build System: Documentation/kbuild/index.rst * Development Tools: Documentation/dev-tools/index.rst * Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst * Core APIs: Documentation/core-api/index.rst Academic Researcher ------------------- Explore the kernel's architecture and internals: * Researcher Guidelines: Documentation/process/researcher-guidelines.rst * Memory Management: Documentation/mm/index.rst * Scheduler: Documentation/scheduler/index.rst * Networking Stack: Documentation/networking/index.rst * Filesystems: Documentation/filesystems/index.rst * RCU (Read-Copy Update): Documentation/RCU/index.rst * Locking Primitives: Documentation/locking/index.rst * Power Management: Documentation/power/index.rst Security Expert --------------- Security documentation and hardening guides: * Security Documentation: Documentation/security/index.rst * LSM Development: Documentation/security/lsm-development.rst * Self Protection: Documentation/security/self-protection.rst * Reporting Vulnerabilities: Documentation/process/security-bugs.rst * CVE Procedures: Documentation/process/cve.rst * Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst * Security Features: Documentation/userspace-api/seccomp_filter.rst Backport/Maintenance Engineer ----------------------------- Maintain and stabilize kernel versions: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * Backporting Guide: Documentation/process/backporting.rst * Applying Patches: Documentation/process/applying-patches.rst * Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git for Maintainers: Documentation/maintainer/configure-git.rst System Administrator -------------------- Configure, tune, and troubleshoot Linux systems: * Admin Guide: Documentation/admin-guide/index.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst * Tracing/Debugging: Documentation/trace/index.rst * Performance Security: Documentation/admin-guide/perf-security.rst * Hardware Monitoring: Documentation/hwmon/index.rst Maintainer ---------- Lead kernel subsystems and manage contributions: * Maintainer Handbook: Documentation/maintainer/index.rst * Pull Requests: Documentation/maintainer/pull-requests.rst * Managing Patches: Documentation/maintainer/modifying-patches.rst * Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst * Development Process: Documentation/process/maintainer-handbooks.rst * Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git Configuration: Documentation/maintainer/configure-git.rst Hardware Vendor --------------- Write drivers and support new hardware: * Driver API Guide: Documentation/driver-api/index.rst * Driver Model: Documentation/driver-api/driver-model/driver.rst * Device Drivers: Documentation/driver-api/infrastructure.rst * Bus Types: Documentation/driver-api/driver-model/bus.rst * Device Tree Bindings: Documentation/devicetree/bindings/ * Power Management: Documentation/driver-api/pm/index.rst * DMA API: Documentation/core-api/dma-api.rst Distribution Maintainer ----------------------- Package and distribute the kernel: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * ABI Documentation: Documentation/ABI/README * Kernel Configuration: Documentation/kbuild/kconfig.rst * Module Signing: Documentation/admin-guide/module-signing.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst AI Coding Assistant ------------------- CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and follow the AI coding assistants documentation before contributing to the Linux kernel: * Documentation/process/coding-assistants.rst This documentation contains essential requirements about licensing, attribution, and the Developer Certificate of Origin that all AI tools must comply with. 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