linux-kernel - [RFC net-next 1/4] net: marvell: prestera: do not fail if FW reply is bigger

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Message-Id: <20210702182915.1035-2-vadym.kochan@plvision.eu>
Date:   Fri,  2 Jul 2021 21:29:12 +0300
From:   Vadym Kochan <vadym.kochan@...ision.eu>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>, Jiri Pirko <jiri@...lanox.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Serhiy Boiko <serhiy.boiko@...ision.eu>
Cc:     Vadym Kochan <vadym.kochan@...ision.eu>,
        Taras Chornyi <tchornyi@...vell.com>,
        linux-kernel@...r.kernel.org,
        Mickey Rachamim <mickeyr@...vell.com>,
        Vadym Kochan <vkochan@...vell.com>
Subject: [RFC net-next 1/4] net: marvell: prestera: do not fail if FW reply is bigger

From: Vadym Kochan <vkochan@...vell.com>

There might be a case when driver talks to the newer FW version
which has extended message packets with extra fields, in that case
lets just copy minimum what we need/can.

Signed-off-by: Vadym Kochan <vkochan@...vell.com>
---
 drivers/net/ethernet/marvell/prestera/prestera_pci.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_pci.c b/drivers/net/ethernet/marvell/prestera/prestera_pci.c
index a250d394da38..58642b540322 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_pci.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_pci.c
@@ -359,12 +359,7 @@ static int prestera_fw_cmd_send(struct prestera_fw *fw,
 	}
 
 	ret_size = prestera_fw_read(fw, PRESTERA_CMD_RCV_LEN_REG);
-	if (ret_size > out_size) {
-		dev_err(fw->dev.dev, "ret_size (%u) > out_len(%zu)\n",
-			ret_size, out_size);
-		err = -EMSGSIZE;
-		goto cmd_exit;
-	}
+	ret_size = min_t(u32, ret_size, out_size);
 
 	memcpy_fromio(out_msg, fw->cmd_mbox + in_size, ret_size);
 
-- 
2.17.1