linux-kernel - [PATCH net v2 6/7] octeon_ep_vf: add protective null checks in napi callbacks for cn9k cards

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Message-ID: <20241107132846.1118835-7-srasheed@marvell.com>
Date: Thu, 7 Nov 2024 05:28:45 -0800
From: Shinas Rasheed <srasheed@...vell.com>
To: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <hgani@...vell.com>, <sedara@...vell.com>, <vimleshk@...vell.com>,
        <thaller@...hat.com>, <wizhao@...hat.com>, <kheib@...hat.com>,
        <egallen@...hat.com>, <konguyen@...hat.com>, <horms@...nel.org>,
        <frank.feng@...axg.com>, Shinas Rasheed <srasheed@...vell.com>,
        Veerasenareddy Burru <vburru@...vell.com>,
        Satananda Burla
	<sburla@...vell.com>,
        Andrew Lunn <andrew+netdev@...n.ch>,
        "David S. Miller"
	<davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net v2 6/7] octeon_ep_vf: add protective null checks in napi callbacks for cn9k cards

During unload, at times the OQ parsed in the napi callbacks
have been observed to be null, causing system crash.
Add protective checks to avoid the same, for cn9k cards.

Signed-off-by: Shinas Rasheed <srasheed@...vell.com>
---
V2:
  - Split into a separate patch
  - Added more context

V1: https://lore.kernel.org/all/20241101103416.1064930-4-srasheed@marvell.com/

 drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_cn9k.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_cn9k.c b/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_cn9k.c
index 88937fce75f1..f1b7eda3fa42 100644
--- a/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_cn9k.c
+++ b/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_cn9k.c
@@ -273,8 +273,14 @@ static irqreturn_t octep_vf_ioq_intr_handler_cn93(void *data)
 	struct octep_vf_oq *oq;
 	u64 reg_val;
 
-	oct = vector->octep_vf_dev;
+	if (!vector)
+		return IRQ_HANDLED;
+
 	oq = vector->oq;
+	if (!oq)
+		return IRQ_HANDLED;
+
+	oct = vector->octep_vf_dev;
 	/* Mailbox interrupt arrives along with interrupt of tx/rx ring pair 0 */
 	if (oq->q_no == 0) {
 		reg_val = octep_vf_read_csr64(oct, CN93_VF_SDP_R_MBOX_PF_VF_INT(0));
-- 
2.25.1