[Intel-wired-lan] [PATCH net v2] i40e: Fix freeing of uninitialized misc IRQ vector

[Intel-wired-lan] [PATCH net v2] i40e: Fix freeing of uninitialized misc IRQ vector

[Mateusz Palczewski]

From: Sylwester Dziedziuch <sylwesterx.dziedziuch@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. 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_free_misc_vector for __I40E_MISC_IRQ_REQUESTED
PF state which is only set if misc IRQ vectors were properly
initialized.

Fixes: c17401a1dd21 ("i40e: use separate state bit for miscellaneous IRQ setup")
Signed-off-by: Sylwester Dziedziuch <sylwesterx.dziedziuch@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
---
 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..b16ae48 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -3987,7 +3987,8 @@ static void i40e_free_misc_vector(struct i40e_pf *pf)
 	wr32(&pf->hw, I40E_PFINT_ICR0_ENA, 0);
 	i40e_flush(&pf->hw);
 
-	if (pf->flags & I40E_FLAG_MSIX_ENABLED && pf->msix_entries) {
+	if (pf->flags & I40E_FLAG_MSIX_ENABLED && pf->msix_entries &&
+	    test_bit(__I40E_MISC_IRQ_REQUESTED, pf->state)) {
 		synchronize_irq(pf->msix_entries[0].vector);
 		free_irq(pf->msix_entries[0].vector, pf);
 		clear_bit(__I40E_MISC_IRQ_REQUESTED, pf->state);
-- 
2.27.0