On ACPI machines, the tegra i2c module encounters an issue due to a mutex being called inside a spinlock. This leads to the following bug: BUG: sleeping function called from invalid context at kernel/locking/mutex.c:585 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 1282, name: kssif0010 preempt_count: 0, expected: 0 RCU nest depth: 0, expected: 0 irq event stamp: 0 Call trace: dump_backtrace+0xf0/0x140 show_stack (./arch/x86/include/asm/current.h:49 arch/x86/kernel/dumpstack.c:312) dump_stack_lvl (lib/dump_stack.c:89 lib/dump_stack.c:115) dump_stack (lib/earlycpio.c:61) __might_resched (./arch/x86/include/asm/current.h:49 kernel/sched/core.c:10297) __might_sleep (./include/linux/lockdep.h:231 kernel/sched/core.c:10236) __mutex_lock_common+0x5c/0x2190 mutex_lock_nested (kernel/locking/mutex.c:751) acpi_subsys_runtime_resume+0xb8/0x160 __rpm_callback+0x1cc/0x4b0 rpm_resume+0xa60/0x1078 __pm_runtime_resume+0xbc/0x130 tegra_i2c_xfer+0x74/0x398 __i2c_transfer (./include/trace/events/i2c.h:122 drivers/i2c/i2c-core-base.c:2258) The problem arises because during __pm_runtime_resume(), the spinlock &dev->power.lock is acquired before rpm_resume() is called. Later, rpm_resume() invokes acpi_subsys_runtime_resume(), which relies on mutexes, triggering the error. To address this issue, devices on ACPI are now marked as not IRQ-safe, considering the dependency of acpi_subsys_runtime_resume() on mutexes. Co-developed-by: Michael van der Westhuizen <rmikey@xxxxxxxx> Signed-off-by: Michael van der Westhuizen <rmikey@xxxxxxxx> Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx> --- drivers/i2c/busses/i2c-tegra.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 85b31edc558d..6d783ecc3431 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -1804,7 +1804,7 @@ static int tegra_i2c_probe(struct platform_device *pdev) * VI I2C device shouldn't be marked as IRQ-safe because VI I2C won't * be used for atomic transfers. */ - if (!IS_VI(i2c_dev)) + if (!IS_VI(i2c_dev) && !ACPI_HANDLE(i2c_dev->dev)) pm_runtime_irq_safe(i2c_dev->dev); pm_runtime_enable(i2c_dev->dev); -- 2.43.5
