[PATCH net v3 6/7] octeon_ep_vf: add protective null checks in napi callbacks for cn9k cards

[Shinas Rasheed <srasheed@marvell.com>]

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: cb7dd712189f ("octeon_ep_vf: Add driver framework and device initialization")
Signed-off-by: Shinas Rasheed <srasheed@marvell.com>
---
V3:
  - Added back "Fixes" to the changelist

V2: https://lore.kernel.org/all/20241107132846.1118835-7-srasheed@marvell.com/
  - 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