[PATCH V2 net] net: mana: Fix error handling in mana_create_txq/rxq's NAPI cleanup
From: Souradeep Chakrabarti
Date: Fri Aug 23 2024 - 05:45:08 EST
Currently napi_disable() gets called during rxq and txq cleanup,
even before napi is enabled and hrtimer is initialized. It causes
kernel panic.
? page_fault_oops+0x136/0x2b0
? page_counter_cancel+0x2e/0x80
? do_user_addr_fault+0x2f2/0x640
? refill_obj_stock+0xc4/0x110
? exc_page_fault+0x71/0x160
? asm_exc_page_fault+0x27/0x30
? __mmdrop+0x10/0x180
? __mmdrop+0xec/0x180
? hrtimer_active+0xd/0x50
hrtimer_try_to_cancel+0x2c/0xf0
hrtimer_cancel+0x15/0x30
napi_disable+0x65/0x90
mana_destroy_rxq+0x4c/0x2f0
mana_create_rxq.isra.0+0x56c/0x6d0
? mana_uncfg_vport+0x50/0x50
mana_alloc_queues+0x21b/0x320
? skb_dequeue+0x5f/0x80
Fixes: e1b5683ff62e ("net: mana: Move NAPI from EQ to CQ")
Signed-off-by: Souradeep Chakrabarti <schakrabarti@xxxxxxxxxxxxxxxxxxx>
---
V2 -> V1:
Addressed the comment on cleaning up napi for the queues,
where queue creation was successful.
---
drivers/net/ethernet/microsoft/mana/mana_en.c | 22 +++++++++++--------
1 file changed, 13 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 39f56973746d..7448085fd49e 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -1872,10 +1872,11 @@ static void mana_destroy_txq(struct mana_port_context *apc)
for (i = 0; i < apc->num_queues; i++) {
napi = &apc->tx_qp[i].tx_cq.napi;
- napi_synchronize(napi);
- napi_disable(napi);
- netif_napi_del(napi);
-
+ if (napi->dev == apc->ndev) {
+ napi_synchronize(napi);
+ napi_disable(napi);
+ netif_napi_del(napi);
+ }
mana_destroy_wq_obj(apc, GDMA_SQ, apc->tx_qp[i].tx_object);
mana_deinit_cq(apc, &apc->tx_qp[i].tx_cq);
@@ -2023,14 +2024,17 @@ static void mana_destroy_rxq(struct mana_port_context *apc,
napi = &rxq->rx_cq.napi;
- if (validate_state)
- napi_synchronize(napi);
+ if (napi->dev == apc->ndev) {
- napi_disable(napi);
+ if (validate_state)
+ napi_synchronize(napi);
- xdp_rxq_info_unreg(&rxq->xdp_rxq);
+ napi_disable(napi);
- netif_napi_del(napi);
+ netif_napi_del(napi);
+ }
+
+ xdp_rxq_info_unreg(&rxq->xdp_rxq);
mana_destroy_wq_obj(apc, GDMA_RQ, rxq->rxobj);
--
2.34.1