linux-kernel - [PATCH V2,net-next, 3/3] net: mana: Add WARN_ON

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Date:   Tue, 24 Aug 2021 09:46:01 -0700
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     linux-hyperv@...r.kernel.org, netdev@...r.kernel.org
Cc:     haiyangz@...rosoft.com, kys@...rosoft.com, sthemmin@...rosoft.com,
        paulros@...rosoft.com, shacharr@...rosoft.com, olaf@...fle.de,
        vkuznets@...hat.com, davem@...emloft.net,
        linux-kernel@...r.kernel.org
Subject: [PATCH V2,net-next, 3/3] net: mana: Add WARN_ON_ONCE in case of CQE read overflow

This is not an expected case normally.
Add WARN_ON_ONCE in case of CQE read overflow, instead of failing
silently.

Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>

---
v2: Add this warning suggested by Dexuan Cui <decui@...rosoft.com>
---
 drivers/net/ethernet/microsoft/mana/gdma_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 798099d64202..cee75b561f59 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -1093,7 +1093,7 @@ static int mana_gd_read_cqe(struct gdma_queue *cq, struct gdma_comp *comp)
 
 	new_bits = (cq->head / num_cqe) & GDMA_CQE_OWNER_MASK;
 	/* Return -1 if overflow detected. */
-	if (owner_bits != new_bits)
+	if (WARN_ON_ONCE(owner_bits != new_bits))
 		return -1;
 
 	comp->wq_num = cqe->cqe_info.wq_num;
-- 
2.25.1