netdev - [PATCH net v4 3/7] octeon_ep: add protective null checks in napi callbacks for cn9k cards

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Message-ID: <20241113111319.1156507-4-srasheed@marvell.com>
Date: Wed, 13 Nov 2024 03:13:15 -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>,
        "Shinas
 Rasheed" <srasheed@...vell.com>,
        Veerasenareddy Burru <vburru@...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>,
        Satananda Burla <sburla@...vell.com>,
        "Abhijit
 Ayarekar" <aayarekar@...vell.com>
Subject: [PATCH net v4 3/7] octeon_ep: 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.

Fixes: 1f2c2d0cee02 ("octeon_ep: add hardware configuration APIs")
Signed-off-by: Shinas Rasheed <srasheed@...vell.com>
---
V4:
  - No changes

V3: https://lore.kernel.org/all/20241108074543.1123036-4-srasheed@marvell.com/
  - Added back "Fixes" to the changelist

V2: https://lore.kernel.org/all/20241107132846.1118835-4-srasheed@marvell.com/
  - Split into a separate patch
  - Added more context

V1: https://lore.kernel.org/all/20241101103416.1064930-3-srasheed@marvell.com/

 drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c b/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
index b5805969404f..b87336b2e4b9 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
@@ -617,7 +617,14 @@ static irqreturn_t octep_rsvd_intr_handler_cn93_pf(void *dev)
 static irqreturn_t octep_ioq_intr_handler_cn93_pf(void *data)
 {
 	struct octep_ioq_vector *vector = (struct octep_ioq_vector *)data;
-	struct octep_oq *oq = vector->oq;
+	struct octep_oq *oq;
+
+	if (!vector)
+		return IRQ_HANDLED;
+	oq = vector->oq;
+
+	if (!oq || !(oq->napi))
+		return IRQ_HANDLED;
 
 	napi_schedule_irqoff(oq->napi);
 	return IRQ_HANDLED;
-- 
2.25.1