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From:   Liming Sun <limings@nvidia.com>
To:     Vadim Pasternak <vadimp@nvidia.com>,
        David Thompson <davthompson@nvidia.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Mark Gross <markgross@kernel.org>,
        Dan Carpenter <dan.carpenter@linaro.org>
CC:     Liming Sun <limings@nvidia.com>,
        <platform-driver-x86@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH v2] platform/mellanox: mlxbf-tmfifo: Fix a warning message
Date:   Thu, 12 Oct 2023 19:02:35 -0400
Message-ID: <20231012230235.219861-1-limings@nvidia.com>
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This commit fixes the smatch static checker warning in function
mlxbf_tmfifo_rxtx_word() which complains data not initialized at
line 634 when IS_VRING_DROP() is TRUE.

Signed-off-by: Liming Sun <limings@nvidia.com>
---
v1->v2: Logic adjustment for Hans's comment
  - Adjust the logic to avoid confusion.
v1: Initial version.
---
 drivers/platform/mellanox/mlxbf-tmfifo.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/platform/mellanox/mlxbf-tmfifo.c b/drivers/platform/mellanox/mlxbf-tmfifo.c
index f3696a54a2bd..d9615ad60012 100644
--- a/drivers/platform/mellanox/mlxbf-tmfifo.c
+++ b/drivers/platform/mellanox/mlxbf-tmfifo.c
@@ -607,24 +607,25 @@ static void mlxbf_tmfifo_rxtx_word(struct mlxbf_tmfifo_vring *vring,
 
 	if (vring->cur_len + sizeof(u64) <= len) {
 		/* The whole word. */
-		if (!IS_VRING_DROP(vring)) {
-			if (is_rx)
+		if (is_rx) {
+			if (!IS_VRING_DROP(vring))
 				memcpy(addr + vring->cur_len, &data,
 				       sizeof(u64));
-			else
-				memcpy(&data, addr + vring->cur_len,
-				       sizeof(u64));
+		} else {
+			memcpy(&data, addr + vring->cur_len,
+			       sizeof(u64));
 		}
 		vring->cur_len += sizeof(u64);
 	} else {
 		/* Leftover bytes. */
-		if (!IS_VRING_DROP(vring)) {
-			if (is_rx)
+		if (is_rx) {
+			if (!IS_VRING_DROP(vring))
 				memcpy(addr + vring->cur_len, &data,
 				       len - vring->cur_len);
-			else
-				memcpy(&data, addr + vring->cur_len,
-				       len - vring->cur_len);
+		} else {
+			data = 0;
+			memcpy(&data, addr + vring->cur_len,
+			       len - vring->cur_len);
 		}
 		vring->cur_len = len;
 	}
-- 
2.30.1