On Mon, Aug 04, 2025 at 08:07:27PM +0200, Sebastian Reichel wrote:
Hello Sasha,
On Sun, Aug 03, 2025 at 08:23:22PM -0400, Sasha Levin wrote:
From: Yongbo Zhang giraffesnn123@gmail.com
[ Upstream commit 1c2d81bded1993bb2c7125a911db63612cdc8d40 ]
When the gpio irqchip connected to a slow bus(e.g., i2c bus or virtio bus), calling disable_irq_nosync() in top-half ISR handler will trigger the following kernel BUG:
BUG: scheduling while atomic: RenderEngine/253/0x00010002 ... Call trace: dump_backtrace+0x0/0x1c8 show_stack+0x1c/0x2c dump_stack_lvl+0xdc/0x12c dump_stack+0x1c/0x64 __schedule_bug+0x64/0x80 schedule_debug+0x98/0x118 __schedule+0x68/0x704 schedule+0xa0/0xe8 schedule_timeout+0x38/0x124 wait_for_common+0xa4/0x134 wait_for_completion+0x1c/0x2c _virtio_gpio_req+0xf8/0x198 virtio_gpio_irq_bus_sync_unlock+0x94/0xf0 __irq_put_desc_unlock+0x50/0x54 disable_irq_nosync+0x64/0x94 fusb302_irq_intn+0x24/0x84 __handle_irq_event_percpu+0x84/0x278 handle_irq_event+0x64/0x14c handle_level_irq+0x134/0x1d4 generic_handle_domain_irq+0x40/0x68 virtio_gpio_event_vq+0xb0/0x130 vring_interrupt+0x7c/0x90 vm_interrupt+0x88/0xd8 __handle_irq_event_percpu+0x84/0x278 handle_irq_event+0x64/0x14c handle_fasteoi_irq+0x110/0x210 __handle_domain_irq+0x80/0xd0 gic_handle_irq+0x78/0x154 el0_irq_naked+0x60/0x6c
This patch replaces request_irq() with devm_request_threaded_irq() to avoid the use of disable_irq_nosync().
Signed-off-by: Yongbo Zhang giraffesnn123@gmail.com Reviewed-by: Heikki Krogerus heikki.krogerus@linux.intel.com Link: https://lore.kernel.org/r/20250526043433.673097-1-giraffesnn123@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org
I suggest to wait wait a bit with backporting this commit until the discussion I just started has been resolved (also applies to all the other stable kernel releases you included this patch for):
https://lore.kernel.org/linux-usb/m7n22g5fsfvpjz4s5d6zfcfddrzrj3ixgaqehrjkg7...
I'll drop it, thanks!