linux-kernel - [PATCH net v4 7/7] octeon_ep_vf: add protective null checks in napi callbacks for cnxk cards

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Message-ID: <20241113111319.1156507-8-srasheed@marvell.com>
Date: Wed, 13 Nov 2024 03:13:19 -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>,
        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 v4 7/7] octeon_ep_vf: add protective null checks in napi callbacks for cnxk 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 cnxk cards.

Fixes: cb7dd712189f ("octeon_ep_vf: Add driver framework and device initialization")
Signed-off-by: Shinas Rasheed <srasheed@...vell.com>
---
V4:
  - No Changes

V3: https://lore.kernel.org/all/20241108074543.1123036-8-srasheed@marvell.com/
  - Added back "Fixes" to the changelist

V2: https://lore.kernel.org/all/20241107132846.1118835-8-srasheed@marvell.com/
  - Split into a separate patch
  - Added more context

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

 .../ethernet/marvell/octeon_ep_vf/octep_vf_cnxk.c    | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_cnxk.c b/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_cnxk.c
index 1f79dfad42c6..31c0d7c0492a 100644
--- a/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_cnxk.c
+++ b/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_cnxk.c
@@ -284,8 +284,14 @@ static irqreturn_t octep_vf_ioq_intr_handler_cnxk(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, CNXK_VF_SDP_R_MBOX_PF_VF_INT(0));
@@ -294,6 +300,10 @@ static irqreturn_t octep_vf_ioq_intr_handler_cnxk(void *data)
 			octep_vf_write_csr64(oct, CNXK_VF_SDP_R_MBOX_PF_VF_INT(0), reg_val);
 		}
 	}
+
+	if (!(oq->napi))
+		return IRQ_HANDLED;
+
 	napi_schedule_irqoff(oq->napi);
 	return IRQ_HANDLED;
 }
-- 
2.25.1