From 4de5215f068d068c61c922df799937362005613d Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Fri, 11 Feb 2022 19:14:55 +0100 Subject: [PATCH 160/166] i2c: core: Use generic_handle_irq_safe() in i2c_handle_smbus_host_notify(). The i2c-i801 driver invokes i2c_handle_smbus_host_notify() from his interrupt service routine. On PREEMPT_RT i2c-i801's handler is forced threaded with enabled interrupts which leads to a warning by handle_irq_event_percpu() assuming that irq_default_primary_handler() enabled interrupts. i2c-i801's interrupt handler can't be made non-threaded because the interrupt line is shared with other devices. Use generic_handle_irq_safe() which can invoked with disabled and enabled interrupts. Reported-by: Michael Below Link: https://bugs.debian.org/1002537 Cc: Salvatore Bonaccorso Signed-off-by: Sebastian Andrzej Siewior Reviewed-by: Oleksandr Natalenko Acked-by: Wolfram Sang Link: https://lore.kernel.org/r/20220211181500.1856198-3-bigeasy@linutronix.de (cherry picked from commit 7e44f2d97e9c2662134fa50b901a1312c5c1a544) Signed-off-by: Clark Williams --- drivers/i2c/i2c-core-base.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-5.15.32-rt39/drivers/i2c/i2c-core-base.c =================================================================== --- linux-5.15.32-rt39.orig/drivers/i2c/i2c-core-base.c +++ linux-5.15.32-rt39/drivers/i2c/i2c-core-base.c @@ -1422,7 +1422,7 @@ int i2c_handle_smbus_host_notify(struct if (irq <= 0) return -ENXIO; - generic_handle_irq(irq); + generic_handle_irq_safe(irq); return 0; }