netdev - [PATCH V2 net] net: mana: Fix error handling in mana_create

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Message-Id: <1724406269-10868-1-git-send-email-schakrabarti@linux.microsoft.com>
Date: Fri, 23 Aug 2024 02:44:29 -0700
From: Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>
To: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	davem@...emloft.net,
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	netdev@...r.kernel.org,
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Cc: schakrabarti@...rosoft.com,
	Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>
Subject: [PATCH V2 net] net: mana: Fix error handling in mana_create_txq/rxq's NAPI cleanup

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@...ux.microsoft.com>
---
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