linux-kernel - [PATCH 4.4 088/112] bnx2x: Prevent false warning for lack of FC NPIV

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Date:   Wed, 26 Oct 2016 14:23:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Andrew Patterson <andrew.patterson@....com>,
        Yuval Mintz <Yuval.Mintz@...gic.com>,
        "David S. Miller" <davem@...emloft.net>,
        Juerg Haefliger <juerg.haefliger@....com>
Subject: [PATCH 4.4 088/112] bnx2x: Prevent false warning for lack of FC NPIV

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yuval Mintz <Yuval.Mintz@...gic.com>

commit 1e6bb1a3540fec3ef112b9a89dda88e684c3ff59 upstream.

Not all adapters have FC-NPIV configured. If bnx2fc is used with such an
adapter, driver would read irrelevant data from the the nvram and log
"FC-NPIV table with bad length..." In system logs.

Simply accept that reading '0' as the feature offset in nvram indicates
the feature isn't there and return.

Reported-by: Andrew Patterson <andrew.patterson@....com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@...gic.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Juerg Haefliger <juerg.haefliger@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -14819,6 +14819,10 @@ static int bnx2x_get_fc_npiv(struct net_
 	}

 	offset = SHMEM2_RD(bp, fc_npiv_nvram_tbl_addr[BP_PORT(bp)]);
+	if (!offset) {
+		DP(BNX2X_MSG_MCP, "No FC-NPIV in NVRAM\n");
+		goto out;
+	}
 	DP(BNX2X_MSG_MCP, "Offset of FC-NPIV in NVRAM: %08x\n", offset);

 	/* Read the table contents from nvram */