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From:   Valentin Schneider <valentin.schneider@arm.com>
To:     linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org
Cc:     Will Deacon <will@kernel.org>, Mark Rutland <mark.rutland@arm.com>,
        Marc Zyngier <maz@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Mel Gorman <mgorman@techsingularity.net>
Subject: [SPLAT 3/3] gpio: dwapb: Sleeping spinlocks down IRQ mapping
Date:   Tue, 10 Aug 2021 14:41:27 +0100
Message-Id: <20210810134127.1394269-4-valentin.schneider@arm.com>
In-Reply-To: <20210810134127.1394269-1-valentin.schneider@arm.com>
References: <20210810134127.1394269-1-valentin.schneider@arm.com>
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[   11.549741] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:35
[   11.549745] in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 553, name: systemd-udevd
[   11.549747] 4 locks held by systemd-udevd/553:
[   11.549749] #0: ffff00080338b168 (&dev->mutex){....}-{0:0}, at: __device_driver_lock (drivers/base/dd.c:1029) 
[   11.549760] #1: ffff800011df0780 (irq_domain_mutex){+.+.}-{3:3}, at: irq_domain_associate (kernel/irq/irqdomain.c:576) 
[   11.549769] #2: ffff0008112a6900 (lock_class){....}-{2:2}, at: __irq_get_desc_lock (kernel/irq/irqdesc.c:857) 
[   11.549775] #3: ffff0008112a59c8 (&gc->bgpio_lock){+.+.}-{0:0}, at: dwapb_irq_ack (drivers/gpio/gpio-dwapb.c:151 drivers/gpio/gpio-dwapb.c:233) gpio_dwapb
[   11.549783] irq event stamp: 157476
[   11.549785] hardirqs last enabled at (157475): _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:160 kernel/locking/spinlock.c:194) 
[   11.549790] hardirqs last disabled at (157476): _raw_spin_lock_irqsave (./include/linux/spinlock_api_smp.h:108 kernel/locking/spinlock.c:162) 
[   11.549793] softirqs last enabled at (0): copy_process (./include/linux/lockdep.h:195 ./include/linux/lockdep.h:202 ./include/linux/lockdep.h:208 ./include/linux/seqlock.h:78 kernel/fork.c:2084) 
[   11.549797] softirqs last disabled at (0): 0x0 
[   11.549801] Preemption disabled at:
[   11.549802] __irq_get_desc_lock (kernel/irq/irqdesc.c:857) 
[   11.549806] CPU: 22 PID: 553 Comm: systemd-udevd Tainted: G        W         5.14.0-rc4-rt6-torture+ #56
[   11.549808] Hardware name: MiTAC RAPTOR EV-883832-X3-0001/RAPTOR, BIOS 1.0 06/28/2019
[   11.549810] Call trace:
[   11.549811] dump_backtrace (arch/arm64/kernel/stacktrace.c:151) 
[   11.549814] show_stack (arch/arm64/kernel/stacktrace.c:217) 
[   11.549815] dump_stack_lvl (lib/dump_stack.c:106) 
[   11.549819] dump_stack (lib/dump_stack.c:113) 
[   11.549821] ___might_sleep (kernel/sched/core.c:9306) 
[   11.549824] rt_spin_lock (kernel/locking/rtmutex.c:1641 (discriminator 4) kernel/locking/spinlock_rt.c:30 (discriminator 4) kernel/locking/spinlock_rt.c:36 (discriminator 4) kernel/locking/spinlock_rt.c:44 (discriminator 4)) 
[   11.549827] dwapb_irq_ack (drivers/gpio/gpio-dwapb.c:151 drivers/gpio/gpio-dwapb.c:233) gpio_dwapb
[   11.549831] __irq_do_set_handler (kernel/irq/chip.c:414 kernel/irq/chip.c:406 kernel/irq/chip.c:1009) 
[   11.549833] __irq_set_handler (kernel/irq/internals.h:178 kernel/irq/chip.c:1053) 
[   11.549836] irq_set_chip_and_handler_name (kernel/irq/chip.c:1080) 
[   11.549838] gpiochip_irq_map (drivers/gpio/gpiolib.c:1262) 
[   11.549842] irq_domain_associate (kernel/irq/irqdomain.c:579) 
[   11.549845] irq_create_mapping_affinity (kernel/irq/irqdomain.c:716) 
[   11.549848] gpiochip_to_irq (drivers/gpio/gpiolib.c:1365) 
[   11.549851] gpiod_to_irq (drivers/gpio/gpiolib.c:3082) 
[   11.549853] acpi_gpiochip_alloc_event (drivers/gpio/gpiolib-acpi.c:422) 
[   11.549856] acpi_walk_resource_buffer (drivers/acpi/acpica/rsxface.c:548) 
[   11.549859] acpi_walk_resources (drivers/acpi/acpica/rsxface.c:623 drivers/acpi/acpica/rsxface.c:594) 
[   11.549862] acpi_gpiochip_request_interrupts (drivers/gpio/gpiolib-acpi.c:505) 
[   11.549864] gpiochip_add_data_with_key (drivers/gpio/gpiolib.c:748) 
[   11.549867] devm_gpiochip_add_data_with_key (drivers/gpio/gpiolib-devres.c:510) 
[   11.549869] dwapb_gpio_probe (drivers/gpio/gpio-dwapb.c:517 drivers/gpio/gpio-dwapb.c:712) gpio_dwapb
[   11.549873] platform_probe (drivers/base/platform.c:1428) 
[   11.549876] really_probe (drivers/base/dd.c:517 drivers/base/dd.c:595 drivers/base/dd.c:541) 
[   11.549877] __driver_probe_device (drivers/base/dd.c:747) 
[   11.549879] driver_probe_device (drivers/base/dd.c:777) 
[   11.549881] __driver_attach (drivers/base/dd.c:1137) 
[   11.549883] bus_for_each_dev (drivers/base/bus.c:301) 
[   11.549885] driver_attach (drivers/base/dd.c:1154) 
[   11.549887] bus_add_driver (drivers/base/bus.c:619) 
[   11.549888] driver_register (drivers/base/driver.c:171) 
[   11.549890] __platform_driver_register (drivers/base/platform.c:875) 
[   11.549893] dwapb_gpio_driver_init (drivers/gpio/gpio-dwapb.c:343) gpio_dwapb
[   11.549897] do_one_initcall (init/main.c:1282) 
[   11.549900] do_init_module (kernel/module.c:3690) 
[   11.549904] load_module (kernel/module.c:4091) 
[   11.549906] __do_sys_finit_module (kernel/module.c:4182) 
[   11.549909] __arm64_sys_finit_module (kernel/module.c:4159) 
[   11.549911] invoke_syscall (./arch/arm64/include/asm/current.h:19 ./arch/arm64/include/asm/compat.h:183 arch/arm64/kernel/syscall.c:57) 
[   11.549914] el0_svc_common (./arch/arm64/include/asm/daifflags.h:28 arch/arm64/kernel/syscall.c:153) 
[   11.549917] do_el0_svc (arch/arm64/kernel/syscall.c:185) 
[   11.549919] el0_svc (arch/arm64/kernel/entry-common.c:512) 
[   11.549922] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:528) 
[   11.549924] el0t_64_sync (arch/arm64/kernel/entry.S:574)