[PATCH v4 1/6] octeontx2-pf: handle otx2_mbox_get_rsp errors in otx2_common.c

[Dipendra Khadka <kdipendra88@gmail.com>]

Add error pointer check after calling otx2_mbox_get_rsp().

Fixes: ab58a416c93f ("octeontx2-pf: cn10k: Get max mtu supported from admin function")
Signed-off-by: Dipendra Khadka <kdipendra88@gmail.com>
---
v4:
 - Sent for patch version consistency.
v3:https://lore.kernel.org/all/20241006164018.1820-1-kdipendra88@gmail.com/
 - Included in the patch set
 - Changed the patch subject
v2: https://lore.kernel.org/all/20240923161738.4988-1-kdipendra88@gmail.com/
 - Added Fixes: tag.
 - Changed the return logic to follow the existing return path.
v1: https://lore.kernel.org/all/20240923110633.3782-1-kdipendra88@gmail.com/
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
index 87d5776e3b88..7510a918d942 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
@@ -1837,6 +1837,10 @@ u16 otx2_get_max_mtu(struct otx2_nic *pfvf)
 	if (!rc) {
 		rsp = (struct nix_hw_info *)
 		       otx2_mbox_get_rsp(&pfvf->mbox.mbox, 0, &req->hdr);
+		if (IS_ERR(rsp)) {
+			rc = PTR_ERR(rsp);
+			goto out;
+		}
 
 		/* HW counts VLAN insertion bytes (8 for double tag)
 		 * irrespective of whether SQE is requesting to insert VLAN
-- 
2.43.0