[Intel-wired-lan] [PATCH net v3] i40e: Fix freeing of unitialized misc IRQ vector
Mateusz Palczewski
mateusz.palczewski at intel.com
Fri Sep 24 09:40:41 UTC 2021
From: Sylwester Dziedziuch <sylwesterx.dziedziuch at intel.com>
When VSI set up failed in i40e_probe() as part of PF switch set up
driver was trying to free misc IRQ vectors in
i40e_clear_interrupt_scheme and produced a kernel Oops:
Trying to free already-free IRQ 266
WARNING: CPU: 0 PID: 5 at kernel/irq/manage.c:1731 __free_irq+0x9a/0x300
Workqueue: events work_for_cpu_fn
RIP: 0010:__free_irq+0x9a/0x300
Call Trace:
? synchronize_irq+0x3a/0xa0
free_irq+0x2e/0x60
i40e_clear_interrupt_scheme+0x53/0x190 [i40e]
i40e_probe.part.108+0x134b/0x1a40 [i40e]
? kmem_cache_alloc+0x158/0x1c0
? acpi_ut_update_ref_count.part.1+0x8e/0x345
? acpi_ut_update_object_reference+0x15e/0x1e2
? strstr+0x21/0x70
? irq_get_irq_data+0xa/0x20
? mp_check_pin_attr+0x13/0xc0
? irq_get_irq_data+0xa/0x20
? mp_map_pin_to_irq+0xd3/0x2f0
? acpi_register_gsi_ioapic+0x93/0x170
? pci_conf1_read+0xa4/0x100
? pci_bus_read_config_word+0x49/0x70
? do_pci_enable_device+0xcc/0x100
local_pci_probe+0x41/0x90
work_for_cpu_fn+0x16/0x20
process_one_work+0x1a7/0x360
worker_thread+0x1cf/0x390
? create_worker+0x1a0/0x1a0
kthread+0x112/0x130
? kthread_flush_work_fn+0x10/0x10
ret_from_fork+0x1f/0x40
The problem is that at that point misc IRQ vectors
were not allocated yet and we get a call trace
that driver is trying to free already free IRQ vectors.
Add a check in i40e_clear_interrupt_scheme for __I40E_MISC_IRQ_REQUESTED
PF state before calling i40e_free_misc_vector. This state is set only if
misc IRQ vectors were properly initialized.
Fixes: c17401a1dd21 ("i40e: use separate state bit for miscellaneous IRQ setup")
Reported-by: PJ Waskiewicz <pwaskiewicz at jumptrading.com>
Signed-off-by: Sylwester Dziedziuch <sylwesterx.dziedziuch at intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski at intel.com>
---
v3:moved check for __I40E_MISC_IRQ_REQUESTED from i40e_free_misc_vector to
i40e_clear_interrupt_scheme so i40e_free_misc_vector is not called when
__I40E_MISC_IRQ_REQUESTED pf state is not set. Added kernel oops and
reported-by to the commit message as suggested by PJ.
v2: Fix commmit title typo
---
drivers/net/ethernet/intel/i40e/i40e_main.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 000991a..8a1dfc3 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -4889,7 +4889,8 @@ static void i40e_clear_interrupt_scheme(struct i40e_pf *pf)
{
int i;
- i40e_free_misc_vector(pf);
+ if (test_bit(__I40E_MISC_IRQ_REQUESTED, pf->state))
+ i40e_free_misc_vector(pf);
i40e_put_lump(pf->irq_pile, pf->iwarp_base_vector,
I40E_IWARP_IRQ_PILE_ID);
--
2.27.0
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