[PATCH AUTOSEL 4.14 025/103] i40e: hold the rtnl lock on clearing interrupt scheme

Sasha Levin
2019-11-08T12:00:59Z

From: Patryk Małek <patryk.malek@intel.com>

[ Upstream commit 5cba17b14182696d6bb0ec83a1d087933f252241 ]

Hold the rtnl lock when we're clearing interrupt scheme
in i40e_shutdown and in i40e_remove.

Signed-off-by: Patryk Małek <patryk.malek@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/intel/i40e/i40e_main.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 39029a12a2337..aa2b446d6ad0f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -11885,6 +11885,7 @@ static void i40e_remove(struct pci_dev *pdev)
mutex_destroy(&hw->aq.asq_mutex);

/* Clear all dynamic memory lists of rings, q_vectors, and VSIs */
+ rtnl_lock();
i40e_clear_interrupt_scheme(pf);
for (i = 0; i < pf->num_alloc_vsi; i++) {
if (pf->vsi[i]) {
@@ -11893,6 +11894,7 @@ static void i40e_remove(struct pci_dev *pdev)
pf->vsi[i] = NULL;
}
}
+ rtnl_unlock();

for (i = 0; i < I40E_MAX_VEB; i++) {
kfree(pf->veb[i]);
@@ -12086,7 +12088,13 @@ static void i40e_shutdown(struct pci_dev *pdev)
wr32(hw, I40E_PFPM_WUFC,
(pf->wol_en ? I40E_PFPM_WUFC_MAG_MASK : 0));

+ /* Since we're going to destroy queues during the
+ * i40e_clear_interrupt_scheme() we should hold the RTNL lock for this
+ * whole section
+ */
+ rtnl_lock();
i40e_clear_interrupt_scheme(pf);
+ rtnl_unlock();

if (system_state == SYSTEM_POWER_OFF) {
pci_wake_from_d3(pdev, pf->wol_en);
--
2.20.1