linux-kernel - [PATCH] mthca: work around -Wenum-conversion warning

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Date:   Mon, 26 Oct 2020 22:12:30 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Doug Ledford <dledford@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mthca: work around -Wenum-conversion warning

From: Arnd Bergmann <arnd@...db.de>

gcc points out a suspicious mixing of enum types in a function that
converts from MTHCA_OPCODE_* values to IB_WC_* values:

drivers/infiniband/hw/mthca/mthca_cq.c: In function 'mthca_poll_one':
drivers/infiniband/hw/mthca/mthca_cq.c:607:21: warning: implicit conversion from 'enum <anonymous>' to 'enum ib_wc_opcode' [-Wenum-conversion]
  607 |    entry->opcode    = MTHCA_OPCODE_INVALID;

Nothing seems to ever check for MTHCA_OPCODE_INVALID again, no
idea if this is meaningful, but it seems harmless as it deals
with an invalid input.

Add a cast to suppress the warning.

Fixes: 2a4443a69934 ("[PATCH] IB/mthca: fill in opcode field for send completions")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/infiniband/hw/mthca/mthca_cq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mthca/mthca_cq.c b/drivers/infiniband/hw/mthca/mthca_cq.c
index c3cfea243af8..319b8aa63f36 100644
--- a/drivers/infiniband/hw/mthca/mthca_cq.c
+++ b/drivers/infiniband/hw/mthca/mthca_cq.c
@@ -604,7 +604,7 @@ static inline int mthca_poll_one(struct mthca_dev *dev,
 			entry->byte_len  = MTHCA_ATOMIC_BYTE_LEN;
 			break;
 		default:
-			entry->opcode    = MTHCA_OPCODE_INVALID;
+			entry->opcode    = (u8)MTHCA_OPCODE_INVALID;
 			break;
 		}
 	} else {
-- 
2.27.0