| Message ID | 20241011-lmh-lockdep-v1-1-495cbbe6fef1@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [RESEND] thermal/drivers/qcom/lmh: remove false lockdep backtrace | expand |
On 11/10/2024 07:48, Dmitry Baryshkov wrote: > Annotate LMH IRQs with lockdep classes so that the lockdep doesn't > report possible recursive locking issue between LMH and GIC interrupts. > > For the reference: > > CPU0 > ---- > lock(&irq_desc_lock_class); > lock(&irq_desc_lock_class); > > *** DEADLOCK *** > > Call trace: > dump_backtrace+0x98/0xf0 > show_stack+0x18/0x24 > dump_stack_lvl+0x90/0xd0 > dump_stack+0x18/0x24 > print_deadlock_bug+0x258/0x348 > __lock_acquire+0x1078/0x1f44 > lock_acquire+0x1fc/0x32c > _raw_spin_lock_irqsave+0x60/0x88 > __irq_get_desc_lock+0x58/0x98 > enable_irq+0x38/0xa0 > lmh_enable_interrupt+0x2c/0x38 > irq_enable+0x40/0x8c > __irq_startup+0x78/0xa4 > irq_startup+0x78/0x168 > __enable_irq+0x70/0x7c > enable_irq+0x4c/0xa0 > qcom_cpufreq_ready+0x20/0x2c > cpufreq_online+0x2a8/0x988 > cpufreq_add_dev+0x80/0x98 > subsys_interface_register+0x104/0x134 > cpufreq_register_driver+0x150/0x234 > qcom_cpufreq_hw_driver_probe+0x2a8/0x388 > platform_probe+0x68/0xc0 > really_probe+0xbc/0x298 > __driver_probe_device+0x78/0x12c > driver_probe_device+0x3c/0x160 > __device_attach_driver+0xb8/0x138 > bus_for_each_drv+0x84/0xe0 > __device_attach+0x9c/0x188 > device_initial_probe+0x14/0x20 > bus_probe_device+0xac/0xb0 > deferred_probe_work_func+0x8c/0xc8 > process_one_work+0x20c/0x62c > worker_thread+0x1bc/0x36c > kthread+0x120/0x124 > ret_from_fork+0x10/0x20 > > Fixes: 53bca371cdf7 ("thermal/drivers/qcom: Add support for LMh driver") > Cc: stable@vger.kernel.org > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > --- Applied, thanks
diff --git a/drivers/thermal/qcom/lmh.c b/drivers/thermal/qcom/lmh.c index 5225b3621a56..d2d49264cf83 100644 --- a/drivers/thermal/qcom/lmh.c +++ b/drivers/thermal/qcom/lmh.c @@ -73,7 +73,14 @@ static struct irq_chip lmh_irq_chip = { static int lmh_irq_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw) { struct lmh_hw_data *lmh_data = d->host_data; + static struct lock_class_key lmh_lock_key; + static struct lock_class_key lmh_request_key; + /* + * This lock class tells lockdep that GPIO irqs are in a different + * category than their parents, so it won't report false recursion. + */ + irq_set_lockdep_class(irq, &lmh_lock_key, &lmh_request_key); irq_set_chip_and_handler(irq, &lmh_irq_chip, handle_simple_irq); irq_set_chip_data(irq, lmh_data);
Annotate LMH IRQs with lockdep classes so that the lockdep doesn't report possible recursive locking issue between LMH and GIC interrupts. For the reference: CPU0 ---- lock(&irq_desc_lock_class); lock(&irq_desc_lock_class); *** DEADLOCK *** Call trace: dump_backtrace+0x98/0xf0 show_stack+0x18/0x24 dump_stack_lvl+0x90/0xd0 dump_stack+0x18/0x24 print_deadlock_bug+0x258/0x348 __lock_acquire+0x1078/0x1f44 lock_acquire+0x1fc/0x32c _raw_spin_lock_irqsave+0x60/0x88 __irq_get_desc_lock+0x58/0x98 enable_irq+0x38/0xa0 lmh_enable_interrupt+0x2c/0x38 irq_enable+0x40/0x8c __irq_startup+0x78/0xa4 irq_startup+0x78/0x168 __enable_irq+0x70/0x7c enable_irq+0x4c/0xa0 qcom_cpufreq_ready+0x20/0x2c cpufreq_online+0x2a8/0x988 cpufreq_add_dev+0x80/0x98 subsys_interface_register+0x104/0x134 cpufreq_register_driver+0x150/0x234 qcom_cpufreq_hw_driver_probe+0x2a8/0x388 platform_probe+0x68/0xc0 really_probe+0xbc/0x298 __driver_probe_device+0x78/0x12c driver_probe_device+0x3c/0x160 __device_attach_driver+0xb8/0x138 bus_for_each_drv+0x84/0xe0 __device_attach+0x9c/0x188 device_initial_probe+0x14/0x20 bus_probe_device+0xac/0xb0 deferred_probe_work_func+0x8c/0xc8 process_one_work+0x20c/0x62c worker_thread+0x1bc/0x36c kthread+0x120/0x124 ret_from_fork+0x10/0x20 Fixes: 53bca371cdf7 ("thermal/drivers/qcom: Add support for LMh driver") Cc: stable@vger.kernel.org Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- drivers/thermal/qcom/lmh.c | 7 +++++++ 1 file changed, 7 insertions(+) --- base-commit: 797012914d2d031430268fe512af0ccd7d8e46ef change-id: 20240721-lmh-lockdep-88de09e77089 Best regards,