[PATCH 5.4 337/344] i40e: Relax i40e_xsk_wakeups return value when PF is busy

From: Greg Kroah-Hartman
Date: Fri Feb 21 2020 - 03:16:35 EST

From: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>

[ Upstream commit c77e9f09143822623dd71a0fdc84331129e97c3a ]

Return -EAGAIN instead of -ENETDOWN to provide a slightly milder
information to user space so that an application will know to retry the
syscall when __I40E_CONFIG_BUSY bit is set on pf->state.

Fixes: b3873a5be757 ("net/i40e: Fix concurrency issues between config flow and XSK")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Acked-by: BjÃrn TÃpel <bjorn.topel@xxxxxxxxx>
Link: https://lore.kernel.org/bpf/20200205045834.56795-2-maciej.fijalkowski@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/net/ethernet/intel/i40e/i40e_xsk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index f73cd917c44f7..3156de786d955 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -791,7 +791,7 @@ int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)
struct i40e_ring *ring;

if (test_bit(__I40E_CONFIG_BUSY, pf->state))
- return -ENETDOWN;
+ return -EAGAIN;

if (test_bit(__I40E_VSI_DOWN, vsi->state))
return -ENETDOWN;